optiride electronically controlled air suspension (ecas

OPTIRIDE™ ELECTRONICALLY CONTROLLED AIR SUSPENSION (ECAS) FOR BUSES AND TRUCKS WITH CAN II

(SAE 1939)

MAINTENANCE MANUAL

MM1315cover.indd 1 7/9/2019 7:31:45 PM

Service Notes

Information contained in this publication was in effect at the time the publication was approved for printing and is subject to change without notice or liability. WABCO reserves the right to revise the information presented or to discontinue the production of parts described at any time.

WABCO Maintenance Manual MM-1315 (Revised 08-18)

About This ManualThis manual provides service and repair procedures for WABCO OptiRide™ Electronically Controlled Air Suspension (ECAS) for buses and trucks with CAN II (SAE 1939).

Before You Begin1. Read and understand all instructions and procedures before

you begin to service components.

2. Read and observe all Warning and Caution hazard alertmessages in this publication. They provide information that can help prevent serious personal injury, damage to components,or both.

3. Follow your company’s maintenance and service, installation,and diagnostics guidelines.

4. Use special tools when required to help avoid serious personalinjury and damage to components.

Hazard Alert Messages and Torque Symbols

WARNINGA Warning alerts you to an instruction or procedure that you must follow exactly to avoid serious personal injury and damage to components.

CAUTIONA Caution alerts you to an instruction or procedure that you must follow exactly to avoid damage to components.

@ This symbol alerts you to tighten fasteners to a specified torque value.

How to Obtain Additional Maintenance, Service and Product InformationVisit our Literature Center at wabco-na.com/literature to access and order additional information.

Contact WABCO North America Customer Care at 855-228-3203 (United States and Canada); 001-800-889-1834 (Mexico); or email [email protected].

WARNINGThis product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

mm1315.bk.fm Tuesday, July 9, 2019 7:23 PM

Contents

pg. pg.1 Section 1: IntroductionContentsOverview

2 Components3 Electronic Control Unit (ECU)

Height SensorPressure SensorsSolenoid Valve Block

4 Remote Control Unit (Optional)6 OptiRide™-Related Vehicle Lamps, Switches and Optional

Features

7 Section 2: Diagnostics, Troubleshooting and TestingGeneral InformationMaintenance InformationABS FaultsOptiRide™ FaultsPersonal Computer and Diagnostics Software ProgramDiagnostic Startup

8 Accessing Diagnostic Memory (Fault Codes)10 SPN SID FMI Fault Codes for OptiRide™ ECAS-CAN252 Setting Vehicle Suspension Height Levels (Calibration)

Vehicle Preparation24V Vehicle Height Calibration Procedure Using PC

Diagnostics54 12V Vehicle Height Calibration Procedure Using PC

Diagnostics55 Downloading Parameter and Calibration Settings from File

to ECAS ECU56 Testing Components and Circuits

Test Instructions

58 Section 3: Component ReplacementComponent Removal and InstallationECU ReplacementValve Block Replacement

59 Height Sensor Replacement60 Pressure Sensor Replacement

61 Section 4: System and Component DiagramsDiagramsECU Part Number 446 170 210 0 Connection Scheme for

Pressure Ratio62 ECU Part Number 446 170 210 0 Connection Scheme for

Pressure Equality63 ECU Part Number 446 170 300 0 Connection Scheme for

12-Volt Truck

64 ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Shuttle Bus (4x2)

65 ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Lift Axle Truck with ECAS 4 Valve

66 ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Lift Axle Truck with ECAS 3 Valve

67 ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Truck with ECAS 4 Valve

mm1315.bk.fm Tuesday, July 9, 2019 7:23 PM

1 Introduction

1WABCO Maintenance Manual MM-1315 (Revised 08-18)

1 IntroductionHazard Alert MessagesRead and observe all Warning and Caution hazard alert messages in this publication. They provide information that can help prevent serious personal injury, damage to components, or both.

CAUTIONDue to the active standby feature on OptiRide™, disconnect the height sensor or disconnect the OptiRide™ ECU prior to replacing or working on OptiRide™ components.

ContentsThis manual contains service information for the WABCO OptiRide™ electronically controlled air suspension (ECAS) for buses and trucks with CAN II (SAE 1939) and with air suspensions.

The OptiRide™ system operates in conjunction with the WABCO anti-lock braking system (ABS). The OptiRide™ cannot function correctly without the ABS. The OptiRide™ system uses information from the ABS to determine vehicle speed and wheel slippage to adjust OptiRide™ operation accordingly.

NOTE: For testing and service information for a bus or truck ECAS without CAN II (SAE 1939), refer to Maintenance Manual 37, Electronically Controlled Air Suspension (ECAS) for Buses, for a bus system; or Maintenance Manual 36, Electronically Controlled Air Suspension (ECAS) for Trucks, for a truck system. If you cannot identify the OptiRide™ version installed on your vehicle, contact WABCO North America Customer Care at 855-228-3203.

OverviewThe WABCO OptiRide™ ECAS is an electrically controlled air suspension system designed to enhance the performance of the vehicle’s air suspension. OptiRide™ maintains an accurate leveling of the chassis height through the use of height sensors, electronic control unit (ECU) and solenoid valves. Because of the variety of suspension types and vehicle features, a particular set of parameters was developed for each vehicle type. These parameters determine some of the features and characteristics for the OptiRide™ configuration. In the event of a malfunction in the system, the OptiRide™ indicator lamp will alert the driver and the suspension will retain the existing air pressure in the air suspension bellows.

Some of the features provided by OptiRide™ include:

� Automatic Level Control — OptiRide™ continually monitors the vehicle’s height (axle-to-frame distances) through the ECU and the use of height and pressure sensors. When the height deviates from the preset nominal level, a correction is made quickly, exhausting or pressurizing the air suspension bellows by actuating solenoid valves. OptiRide™ will maintain the nominal vehicle level regardless of the road changes. There are pre-selected restrictions for when the height corrections can be made.

� Driver-Controlled Level Adjustment — Other than the nominal vehicle level, there can be additional levels selected by the driver to raise the vehicle for rough surfaces or lower vehicle height. These levels can be selected by switches on the vehicle dash panel. The driver can also return the vehicle to the nominal level with another dash panel switch (Recovery). There are pre-selected restrictions for when the height changes can be made.

� Vehicle Front Kneeling — This function, normally only on bus and coach, is also selected by the driver activating a switch on the vehicle dash panel, when the vehicle is stationary, and is used to facilitate the passenger entry and exit. Activating the KNEELING switch signals OptiRide™ to activate the front axle valve, exhausting air from the front bellows while maintaining the rear suspension at nominal level. This lowers the vehicle at the entry door step. There are pre-selected restrictions for when the kneeling function can be activated.

� Automatic Traction Help Load Transfer — When wheel slippage is detected by the vehicle’s ABS (due to slippery road surface conditions), a signal from the ABS triggers the OptiRide™ system. OptiRide™ can transfer weight from the non-drive axle (tag) to the vehicle’s drive axle by changing air pressures in the rear axles air suspension bellows. By transferring pressure from the tag axle to the drive axle air bellows, additional weight is transferred to the drive axle, increasing drive wheel traction. This function may also be initiated by the driver activating a switch on the vehicle dash panel. There are pre-selected restrictions for when the traction help can be activated and how much weight can be transferred.

OptiRide™ will continue to hold the transferred load until the preset limits of time or speed have been met, per the vehicle manufacturer settings.

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1 Introduction

2 WABCO Maintenance Manual MM-1315 (Revised 08-18)

� Inclination Level Control (Pressure Equality) — The OptiRide™ ECU can adjust pressures in all air suspension bellows together or in individual air bellows. This allows OptiRide™ to compensate for inclinations caused by unbalanced loads or uneven road surfaces.

� OptiRide™ Height Change Requirements — OptiRide™ has several safety features to help ensure safe and correct level changes. Before OptiRide™ can automatically change vehicle heights, certain requirements, selected via BUS parameters, have to be met. For example, in order to make driver-selected height changes, the status of the doors, parking brake, transmission, vehicle speed and vehicle height may be considered. The requirements are determined by the OEM. Contact your vehicle OEM for further setting details.

ComponentsFigure 1.1 illustrates the major components of OptiRide™.

Figure 1.1

Figure 1.1

4010353a

STOP

M2

M1


1 Introduction


Electronic Control Unit (ECU)The ECU is connected to the other OptiRide™ components, vehicle power, vehicle ground and CAN link through three different AMP connectors. Figure 1.2. The ECU has the following functions:

� Monitors up to four height sensors

� Monitors up to five pressure sensors

� Monitors sidewalk detector (optional)

� Monitors transverse accelerometer sensor (optional)

� Controls up to nine solenoid valves

� Communicates with CAN

� Controls vehicle indicator lamps (optional)

� Monitors function of system components, stores faults and performs diagnostics

Figure 1.2

Height SensorThe WABCO OptiRide™ height sensors are mounted to the vehicle chassis and connected by linkage to the axle housing providing the ECU with ride height information. The height sensor uses use a lever-type sensor housing that contains an inductive coil in which an armature moves inside the housing. The armature is connected to a lever which is attached to the axle by a linkage rod. When the distance between the chassis and the axle changes, the lever causes the armature to move within the coil, changing the analog signal produced by the sensor. The OptiRide™ ECU converts the analog sensor signal into digital numbers called “Timer Ticks” (TT) or “Counts”. Figure 1.3.

Figure 1.3

Pressure SensorsThe vehicle axle loads are determined by using pressure sensors attached to the suspension bellows. OptiRide™ may have pressure sensors on the front axle, the drive axle right and left and or any non-drive rear axle (tag axle) right and left. Figure 1.4.

Figure 1.4

Solenoid Valve BlockSolenoid valve blocks have been developed for the OptiRide™ system. Several solenoid valves may be combined into one compact valve block. The solenoid valves control the air volume within the suspension air bellows by either increasing or decreasing the pressure as required by the ECU. Electrical connectors link the valve block to the ECU. Air ports connect the valve to air supply and to the suspension air bellows. The valve also has an exhaust port which is covered with a noise reduction device called a buffer. Figure 1.5, Figure 1.6 and Figure 1.7.

Figure 1.2

4010354a

Figure 1.3

Figure 1.4

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1 Introduction


Figure 1.5

Figure 1.6

Figure 1.7

Remote Control Unit (Optional)The hand-held remote control unit or keypad is positioned in a bracket that can be mounted on the instrument panel or behind/below the driver’s seat. The driver uses this keypad to alter the vehicle frame height for loading and unloading vehicle and for connecting or disconnecting vehicle from trailers. The keypad is connected to the OptiRide™ ECU by a coiled cable and a socket on the vehicle. Figure 1.8.

Figure 1.8

Figure 1.5

Figure 1.6

4010356a

4010357a

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1 Introduction


Remote Control Operation

The hand-held remote control has several functions:

� Raising and lowering the vehicle suspension

� Returning vehicle to normal ride level

� Stopping all OptiRide™ functions

� Driver ability to preset and store up to two separate chassis heights

ON/OFF — Axle Selection Switch

Before the remote control unit can be used, the remote must be turned on. By pressing the rear axle selection key (center button top row), the remote control is activated and the remote is turned on. An acknowledgement lamp on the remote control indicates that the axle is selected and the unit is active. Pressing the key a second time will turn off the remote control unit and turn off the acknowledgement lamp.

Raising and Lowering Rear Suspension

The remote control unit allows the driver to change the vehicle’s rear suspension height within programmed limits. Pressing the up or down arrow keys cause the chassis height to be immediately altered. Releasing the key ends the height change. Remote control height changes can only be initiated while the vehicle is stationary or traveling at speeds less than the pre-selected parameters allow.

Normal Ride Height Level

Pressing the green Normal Ride Height Level key will immediately return the chassis to the pre-calibrated normal ride height level.

Setting and Selecting Memory Levels

By simultaneously pressing the STOP key and either the M1 or M2 memory keys, the current vehicle level will be stored as a memory height. Memory heights can only be stored while the vehicle is stationary. By pressing only the M1 or M2 memory keys, the chassis level is quickly adjusted to the stored memory height. The M1 or M2 height changes can only be initiated while the vehicle is stationary or at speeds less than 5 mph.

Stop Key

Pressing the STOP key discontinues all height control functions. This allows the driver to discontinue any manually activated height change which could be hazardous.


1 Introduction


OptiRide™-Related Vehicle Lamps, Switches and Optional FeaturesThe following tables describe most of the OptiRide™-related dash panel lamps and switches that could be installed in a vehicle.

Table A: Instrument Panel OptiRide™ 12V Tractor Lamps and Switches

Table B: Instrument Panel OptiRide™ 24V Bus Lamps and Switches

Lamps Switches Functionality

None Rear Rise or Up Arrow Raise rear suspension to pre-set height. Front suspension will remain at current level.

None Rear Lower or Down Arrow Lower rear suspension to pre-set height limit. Front suspension will remain at current level.

None Load Transfer/Momentary Switch Transfers air pressure from the non-drive axle (tag) to the vehicle’s drive axle.

OptiRide™ ECAS Fault or Red Lamp

None Indicates when system fault is active.

Ride Height or Amber Lamp

None Indicates when suspension level is outside of the normal ride height level.

Lamps Switches Functionality

Rear Rise Rear Rise or Up Arrow at back of vehicle Raise rear suspension to pre-set height. Front suspension will remain at current level.

Low Rise Level Control, Low Ride or Down Arrow at side of vehicle

Lower both front and rear suspension to minimum pre-set height limit.

High Rise Level Control, High Ride or Up Arrow at side of vehicle Raise both front and rear suspension to maximum pre-set height limit.

Kneel Kneel or Down Arrow at side of vehicle By holding switch, vehicle front will lower to kneeled position.

Kneel Normal Ride, Kneel Recover or UP/DOWN Arrow at side of vehicle

Will return suspension to normal pre-set ride height.

OptiRide™ ECAS Fault or Red Lamp

None Indicates when system fault is active.

Ride Fault or Amber Lamp

None Indicates when suspension level is outside of the Normal Ride Height Level.

None Economical Ride Enable/Disable Enables or disables economical ride features selected by vehicle manufacturer.


2 Diagnostics, Troubleshooting and Testing


2 Diagnostics, Troubleshooting and TestingGeneral Information

Maintenance InformationThere is no regularly scheduled maintenance required for the WABCO OptiRide™ or ABS. However, OptiRide™ does not change current vehicle maintenance requirements.

ABS FaultsBefore performing any OptiRide™ diagnostics, make sure there are no ABS faults. Because of the interaction between the ABS and OptiRide™, a fault in the ABS may restrict the functionality of the OptiRide™ system. ABS faults can be diagnosed using the vehicle blink code or WABCO TOOLBOX™ Software.

OptiRide™ FaultsThe OptiRide™ Warning Lamp, mounted on the dash panel, indicates when OptiRide™ system faults are detected by the Electronic Control Unit (ECU) and stored in memory as active. If the fault is no longer active, the fault will be stored as inactive. OptiRide™ faults can be diagnosed using the WABCO TOOLBOX™ Software 11.0 or higher on a Personal Computer (PC). Refer to Personal Computer and Diagnostics Software Program in the section that describes using the software.

Personal Computer and Diagnostics Software ProgramThe WABCO OptiRide™ diagnostics software program runs in Windows 2000, NT, XP or Vista. If you have TOOLBOX™ Software with the OptiRide™ program installed on your computer, it may be used to:

� View current system status

� Retrieve and identify system faults

� Get on-screen repair instructions

� Illuminate lamps and activate certain outputs

� Calibrate the OptiRide™ system

� Raise and lower the suspension

� Test valve function and position

� View programmed vehicle parameters

The PC is connected to the vehicle’s SAE J1939 (Deutsch) diagnostic plug through special cables and a converter device. The diagnostic plug is wired to the vehicle’s data system that includes the OptiRide™ and ABS ECUs. In order to access the WABCO diagnostic software, the appropriate ECU and J1939 interface devices need to be selected.

Diagnostic Startup1. Connect the computer to the vehicle as follows. Attach the

J1939 interface device cable from your computer to the vehicle diagnostic port (9 pin Deutsch Connector). Turn the vehicle ignition switch ON. Figure 2.1 and Figure 2.2.

Figure 2.1

Figure 2.2

2. Select TOOLBOX™ Software from the desktop or from the Windows Start Menu, then click on the ECAS CAN II icon.

Figure 2.1

Figure 2.2

4010594a

4010611a

WABCO TOOLBOX 11.5

WABCO TOOLBOX




3. The ECAS main screen will be displayed with a pop-up warning note. Select Yes to clear the note. Figure 2.3.

Figure 2.3

4. The next pop-up screen will ask you to select the diagnostic interface. Select option 3, CAN Bus front section and truck. Figure 2.4.

Figure 2.4

5. The screen will display information relevant to the ECAS system and the ECAS ECU. A drop-down menu is displayed above a row of icons as follows. Figure 2.5.

Figure 2.5

Accessing Diagnostic Memory (Fault Codes)1. To access the ECAS Diagnostic Memory, select Information

from the pull-down menu, then select Diagnostic memory to display the diagnostic memory contents. Select Yes in the pop-up ATTENTION warning screen to continue. Figure 2.6.

Figure 2.6

2. The Active faults are displayed in red and the Inactive faults are in blue. Information about the selected (highlighted) fault is shown in the Message Box at the bottom of the screen. Figure 2.7.

Figure 2.3

Figure 2.4

4010410a

4010411a

Figure 2.5

Figure 2.6

4010412a

4010414a




Figure 2.7

3. The Inactive faults in blue can be cleared by selecting the Clear Diagnostic Memory tab. The Active faults have to be repaired before they can be cleared.

4. The Fault identifiers are listed in the Additional Information box on the bottom right of the screen. The first entry is the SID-marked path, the second is the FMI-marked type, the third entry is priority level and the fourth is the number of occurrences. The list of SID/FMI codes is shown below. Figure 2.8.

Figure 2.8

5. After the Inactive faults are cleared, select the OK tab, then the Cancel tab. This will permanently remove the Inactive faults from the ECU memory.

Figure 2.7

Figure 2.8

4010365a

4010366a




SPN SID FMI Fault Codes for OptiRide™ ECAS-CAN2

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4012002a




Figure 2.10

Figure 2.10

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Res

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atio

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4012003a




Figure 2.11

Figure 2.11

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4012004a




Figure 2.12

Figure 2.12

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4012005a




Figure 2.13

Figure 2.13

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4012006a




Figure 2.14

Figure 2.14

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-->

X2/

6 -

chas

sis

grou

nd =

OL

-->

X3/

3-ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/6

= O

L --

> X

2/1

- X

2/6

= O

L --

> X

2/7

- X

3/3

= O

L --

> X

2/1

- X

3/3

= O

L --

> X

2/6

- X

3/3

= O

L.

Com

mon

P

ower

for

Pre

ssur

e S

enso

rs

2742

2246

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Che

ck fo

r D

C v

olta

ge fr

om p

in 1

- 2

on

the

sens

or c

onne

ctor

=

8 -

30

v (r

epea

t for

bot

h ax

les)

. K

ey O

ff- D

isco

nnec

t bot

h pr

essu

re s

enso

rs a

nd d

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd =

OL

-->

X2/

1 -

chas

sis

grou

nd =

OL

-->

X2/

6 -

chas

sis

grou

nd =

OL

-->

X3/

3-ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/6

= O

L --

> X

2/1

- X

2/6

= O

L --

> X

2/7

- X

3/3

= O

L --

> X

2/1

- X

3/3

= O

L --

> X

2/6

- X

3/3

= O

L.

Com

mon

P

ower

for

Pre

ssur

e S

enso

rs

2742

2246

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Che

ck fo

r D

C v

olta

ge fr

om p

in 1

- 2

on

the

sens

or c

onne

ctor

=

8 -

30

v (r

epea

t for

bot

h ax

les)

. K

ey O

ff- D

isco

nnec

t bot

h pr

essu

re s

enso

rs a

nd d

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd =

OL

-->

X2/

1 -

chas

sis

grou

nd =

OL

-->

X2/

6 -

chas

sis

grou

nd =

OL

-->

X3/

3-ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/6

= O

L --

> X

2/1

- X

2/6

= O

L --

> X

2/7

- X

3/3

= O

L --

> X

2/1

- X

3/3

= O

L --

> X

2/6

- X

3/3

= O

L.

4012007a




Figure 2.15

Figure 2.15

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

So

len

oid

Val

ves

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)27

4180

43

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3) If

the

volta

ge is

off,

dis

conn

ect a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

10 –

X2/

4 =

15-

25 o

hms.

If th

e re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

15

-25

ohm

s an

d 4-

3 =

15-2

5 oh

ms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

10 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

from

X2/

4 -

X2/

10 =

OL

-->

X2/

4 -

X2/

11 =

OL

-->

X2/

10 -

X2/

11 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)27

4180

45

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M

vs A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3) If

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/10

– X

2/4

= 1

5-25

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

=

15-2

5 oh

ms

and

4-3

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e fr

om X

2/4

- X

2/10

=O

L --

> X

2/4

- X

2/11

=O

L --

> X

2/10

- X

2/11

=O

L K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012008a




Figure 2.16

Figure 2.16

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)27

4180

46

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/10

– X

2/4

= 1

5-25

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

=

15-2

5 oh

ms

and

4-3

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e fr

om X

2/4

- X

2/10

=O

L --

> X

2/4

- X

2/11

=O

L --

> X

2/10

- X

2/11

=O

L K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(2/2

Sol

enoi

d V

alve

)

2741

826

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 1

5-25

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

=

15-2

5 oh

ms

and

4-3

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/14

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e fr

om X

2/4

- X

2/14

=O

L --

> X

2/4

- X

3/6

=O

L --

> X

2/14

- X

3/6

=O

L K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012009a




Figure 2.17

Figure 2.17

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(2/2

Sol

enoi

d V

alve

)

2741

826

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 1

5-25

ohm

s. If

re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

15

-25

ohm

s an

d 4-

3 =

15-2

5 oh

ms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(2/2

Sol

enoi

d V

alve

)

2741

826

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 1

5-25

ohm

s. If

re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

15

-25

ohm

s an

d 4-

3 =

15-2

5 oh

ms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012010a




Figure 2.18

Figure 2.18

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)27

4183

73

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M

vs A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

11–

X2/

4 =

15-

25 o

hms.

If

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-1

=

15-2

5 oh

ms

and

4-1

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/11

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X2/

10

=O

L --

> X

2/11

- X

2/10

=O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

= O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)27

4183

75

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

11–

X2/

4 =

15-

25 o

hms.

If

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-1

=

15-2

5 oh

ms

and

4-1

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/11

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X2/

10

=O

L --

> X

2/11

- X

2/10

=O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

= O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012011a




Figure 2.19

Figure 2.19

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)27

4183

76

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

11–

X2/

4 =

15-

25 o

hms.

If

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-1

=

15-2

5 oh

ms

and

4-1

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/11

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X2/

10

=O

L --

> X

2/11

- X

2/10

=O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

= O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

2742

1034

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M

vs A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L --

>

X2/

14 -

cha

ssis

gro

und

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to X

2/4

- X

2/11

=O

L --

> X

2/4

- X

2/10

=

OL

-->

X2/

11 -

X2/

10 =

OL

-->

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

driv

e an

d ta

g ax

le v

alve

to c

hass

is

grou

nd: P

in1-

cha

ssis

gro

und

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

>

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012012a




Figure 2.20

Figure 2.20

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

2742

1034

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M

vs A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L --

>

X2/

14 -

cha

ssis

gro

und

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to X

2/4

- X

2/11

=O

L --

> X

2/4

- X

2/10

=

OL

-->

X2/

11 -

X2/

10 =

OL

-->

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

driv

e an

d ta

g ax

le v

alve

to c

hass

is

grou

nd: P

in1-

cha

ssis

gro

und

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

>

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

2742

1034

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L --

>

X2/

14 -

cha

ssis

gro

und

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to X

2/4

- X

2/11

=O

L --

> X

2/4

- X

2/10

=

OL

-->

X2/

11 -

X2/

10 =

OL

-->

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

driv

e an

d ta

g ax

le v

alve

to c

hass

is

grou

nd: P

in1-

cha

ssis

gro

und

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

>

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012013a




Figure 2.21

Figure 2.21

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(3/2

Sol

enoi

d V

alve

)

2742

1943

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

4– X

3/6

= 1

5-25

ohm

s. If

re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-1 =

15

-25

ohm

s an

d 4-

1 =

15-2

5 oh

ms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

6 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(3/2

Sol

enoi

d V

alve

)

2742

1943

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3) If

the

volta

ge is

off,

dis

conn

ect a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/4–

X3/

6 =

15-

25 o

hms.

If

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-1

=

15-2

5 oh

ms

and

4-1

=15

-25

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed, c

heck

res

ista

nce

to X

2/4

- X

2/14

=O

L --

> X

2/4

- X

3/6

=O

L --

> X

2/14

- X

3/6

=O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

= O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012014a




Figure 2.22

Figure 2.22

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Lifti

ng/T

raili

ng

= T

ag A

xle

Left

(3/2

Sol

enoi

d V

alve

)

2742

1943

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

"Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- V

erify

the

volta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

ch

assi

s =

4v

- 7v

and

4 -

to

chas

sis

= 4

v -

7v (

depe

ndin

g on

OE

M

vs A

fterm

arke

t ins

talla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vo

ltage

is o

ff, d

isco

nnec

t all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

4– X

3/6

= 1

5-25

ohm

s. If

re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-1 =

15

-25

ohm

s an

d 4-

1 =

15-2

5 oh

ms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

6 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

, che

ck r

esis

tanc

e to

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

6 =

OL

-->

X2/

14 -

X3/

6 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

"

Rem

ote

Co

ntr

ol U

nit

Rem

ote

Con

trol

Uni

t27

4209

3311

Faul

t can

not b

e id

entifi

edR

ed L

amp/

C

heck

EC

AS

No

Aut

omat

ic

or M

anua

l F

unct

ion

Rem

ote

Dam

aged

or

Faul

ty

Dis

conn

ect a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e,

cont

amin

atio

n or

cor

rosi

on.

Ver

ify p

ower

and

gro

und

to th

e R

CU

: Key

On-

Pin

1 -

2 on

the

harn

ess

side

of t

he c

onne

ctor

= 9

- 1

4 v.

UB

for

Rem

ote

Con

trol

Uni

t27

4223

473

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e,

cont

amin

atio

n or

cor

rosi

on.

Ver

ify p

ower

and

gro

und

to th

e R

CU

: Key

On-

Pin

1 -

2 on

the

harn

ess

side

of t

he c

onne

ctor

= 9

- 1

4 v.

UB

for

Rem

ote

Con

trol

Uni

t27

4223

476

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

co

ntam

inat

ion

or c

orro

sion

. V

erify

pow

er a

nd g

roun

d to

the

RC

U:

Key

On-

Pin

1 -

2 on

the

chas

sis

harn

ess

conn

ecto

r =

9 -

14

v.

Key

Off-

Pin

2 to

cha

ssis

gro

und

varie

s w

hen

goin

g th

roug

h E

CU

(no

t O

L).

Key

Off-

X1

EC

U c

onne

ctor

dis

conn

ecte

d. O

n th

e ch

assi

s ha

rnes

s co

nnec

tor

Pin

1 -

cha

ssis

gro

und

= O

L --

> P

in 2

- c

hass

is g

roun

d =

O

L --

> P

in 3

- c

hass

is g

roun

d =

OL

-->

Pin

4 -

cha

ssis

gro

und

= O

L.

Dat

a Li

ne27

4224

483

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

co

ntam

inat

ion

or c

orro

sion

. V

erify

pow

er a

nd g

roun

d to

the

RC

U:

Key

On-

Pin

1 -

2 on

the

chas

sis

harn

ess

conn

ecto

r =

9 -

14

v.

Key

Off-

Pin

2 to

cha

ssis

gro

und

varie

s w

hen

goin

g th

roug

h E

CU

(no

t O

L).

Key

Off-

X1

EC

U c

onne

ctor

dis

conn

ecte

d. O

n th

e ch

assi

s ha

rnes

s co

nnec

tor

Pin

1 -

cha

ssis

gro

und

= O

L --

> P

in 2

- c

hass

is g

roun

d =

O

L --

> P

in 3

- c

hass

is g

roun

d =

OL

-->

Pin

4 -

cha

ssis

gro

und

= O

L.

4012015a




Figure 2.23

Figure 2.23

12V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Dat

a Li

ne27

4224

486

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e,

cont

amin

atio

n or

cor

rosi

on.

Ver

ify p

ower

and

gro

und

to th

e R

CU

: K

ey O

n- P

in 1

-2

on th

e ch

assi

s ha

rnes

s co

nnec

tor

= 9

- 1

4 v.

K

ey O

ff- P

in 2

to c

hass

is g

roun

d va

ries

whe

n go

ing

thro

ugh

EC

U (

not

OL)

. K

ey O

ff- X

1 E

CU

con

nect

or d

isco

nnec

ted.

On

the

chas

sis

harn

ess

conn

ecto

r P

in 1

- c

hass

is g

roun

d =

OL

-->

Pin

2 -

cha

ssis

gro

und

=

OL

-->

Pin

3 -

cha

ssis

gro

und

= O

L --

> P

in 4

- c

hass

is g

roun

d =

OL.

Clo

ck L

ine

2742

2549

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e,

cont

amin

atio

n or

cor

rosi

on.

Ver

ify p

ower

and

gro

und

to th

e R

CU

: K

ey O

n- P

in 1

-2

on th

e ch

assi

s ha

rnes

s co

nnec

tor

= 9

- 1

4 v.

K

ey O

ff- P

in 2

to c

hass

is g

roun

d va

ries

whe

n go

ing

thro

ugh

EC

U (

not

OL)

. K

ey O

ff- X

1 E

CU

con

nect

or d

isco

nnec

ted.

On

the

chas

sis

harn

ess

conn

ecto

r P

in 1

- c

hass

is g

roun

d =

OL

-->

Pin

2 -

cha

ssis

gro

und

=

OL

-->

Pin

3 -

cha

ssis

gro

und

= O

L --

> P

in 4

- c

hass

is g

roun

d =

OL.

Clo

ck L

ine

2742

2549

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Aut

omat

ic

or M

anua

l F

unct

ion

Com

pone

nt

or H

arne

ss

Dam

age

Dis

conn

ect a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

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Figure 2.27

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Figure 2.28

Figure 2.28

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or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X3/

7 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X3/

7 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

3/7

- C

hass

is g

roun

d =

OL.

4012021a




Figure 2.29

Figure 2.29

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Fron

t Axl

e Le

ft17

175

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X3/

7 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X3/

7 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

3/7

- C

hass

is g

roun

d =

OL.

Fron

t Axl

e Le

ft17

176

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X3/

7 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X3/

7 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

3/7

- C

hass

is g

roun

d =

OL.

Driv

ing

Axl

e R

ight

1818

2

Val

ue ju

mp/

Cha

ngin

g va

lues

or

inco

rrec

t val

ues

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

8 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

8 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/8

- C

hass

is g

roun

d =

OL.

4012022a




Figure 2.30

Figure 2.30

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e R

ight

1818

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

8 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

8 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/8

- C

hass

is g

roun

d =

OL.

Driv

ing

Axl

e R

ight

1818

5Lo

w c

urre

nt o

r op

en

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

8 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

8 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/8

- C

hass

is g

roun

d =

OL.

Driv

ing

Axl

e R

ight

1818

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

8 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

8 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/8

- C

hass

is g

roun

d =

OL.

4012023a




Figure 2.31

Figure 2.31

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft 19

192

Val

ue ju

mp/

Cha

ngin

g va

lues

or

inco

rrec

t val

ues

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

9 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

9 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/9

- C

hass

is g

roun

d =

OL.

Driv

ing

Axl

e Le

ft 19

193

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

9 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s If

sens

or r

eadi

ngs

are

corr

ect,

isol

ate

the

com

plet

e he

ight

sen

sor

circ

uit:

Key

Off-

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

ors

at th

e E

CU

, the

n di

scon

nect

all

heig

ht s

enso

rs a

nd in

spec

t bot

h co

nnec

tor

and

sens

or fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

K

ey O

ff- R

esis

tanc

e fr

om X

2/7

- X

2/9

= O

L --

> X

2/7

- C

hass

is g

roun

d =

OL

-->

X2/

9 -

Cha

ssis

gro

und

= O

L.

Driv

ing

Axl

e Le

ft 19

195

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

9 =

70-

110

ohm

s. If

the

read

ing

is o

ut

of s

pec,

ver

ify c

orre

ct r

esis

tanc

e at

the

heig

ht s

enso

r. W

ith X

-2 a

nd

X-3

dis

conn

ecte

d, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or

corr

osio

n: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

9 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

= O

L --

> X

2/9

- C

hass

is g

roun

d =

OL.

4012024a




Figure 2.32

Figure 2.32

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft 19

196

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S -

A

mbe

r La

mp/

Sus

p A

ir

No

Aut

omat

ic

or M

anua

l F

unct

ion/

In

corr

ect

Rid

e H

eigh

t

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

hei

ght s

enso

r an

d in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Dis

conn

ect b

oth

the

X-2

and

X-3

con

nect

or a

t the

EC

U: K

ey O

ff-

Res

ista

nce

from

X2/

7 -

X2/

9 =

70-

110

ohm

s. If

the

read

ing

is o

ut o

f sp

ec, v

erify

cor

rect

res

ista

nce

at th

e he

ight

sen

sor.

With

X-2

and

X-3

di

scon

nect

ed, d

isco

nnec

t the

har

ness

at t

he h

eigh

t sen

sor

and

insp

ect

both

con

nect

or a

nd c

ompo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

: K

ey O

ff- A

cros

s pi

n 1

and

2 =

70-

110

ohm

s.

If se

nsor

rea

ding

s ar

e co

rrec

t, is

olat

e th

e co

mpl

ete

heig

ht s

enso

r ci

rcui

t: K

ey O

ff- D

isco

nnec

t bot

h th

e X

-2 a

nd X

-3 c

onne

ctor

s at

the

EC

U, t

hen

disc

onne

ct a

ll he

ight

sen

sors

and

insp

ect b

oth

conn

ecto

r an

d se

nsor

for

dam

age,

con

tam

inat

ion

or c

orro

sion

.

Key

Off-

Res

ista

nce

from

X2/

7 -

X2/

9 =

OL

-->

X2/

7 -

Cha

ssis

gro

und

=

OL

-->

X2/

9 -

Cha

ssis

gro

und

= O

L.

Pre

ssu

re S

enso

rs

Fron

t Axl

e22

223

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/3

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/3

=

OL.

Fron

t Axl

e22

225

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/3

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/3

=

OL.

Fron

t Axl

e22

226

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/3

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/3

=

OL.

Driv

ing

Axl

e R

ight

2424

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/2

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/2

=

OL.

4012025a




Figure 2.33

Figure 2.33

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e R

ight

2424

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/2

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/2

=

OL.

Driv

ing

Axl

e R

ight

2424

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/2

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/3

= O

L --

> X

2/1

- X

2/2

=

OL.

Driv

ing

Axl

e Le

ft25

253

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/6

= O

L --

> X

2/1

- X

2/6

=

OL.

Driv

ing

Axl

e Le

ft25

255

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

sen

sor

and

insp

ect b

oth

conn

ecto

r an

d co

mpo

nent

for

dam

age,

con

tam

inat

ion

or c

orro

sion

. K

ey O

n- C

heck

for

DC

vol

tage

from

pin

1 -

2 o

n th

e se

nsor

con

nect

or =

8

- 30

v.

Key

Off-

Dis

conn

ect

pres

sure

sen

sor

and

disc

onne

ct b

oth

the

X-2

and

X

-3 c

onne

ctor

s at

the

EC

U c

heck

res

ista

nce

from

X2/

7 -

chas

sis

grou

nd

= O

L --

> X

2/1

- ch

assi

s gr

ound

= O

L --

> X

2/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

Che

ck X

2/7

- X

2/1

= O

L --

> X

2/7

- X

2/6

= O

L --

> X

2/1

- X

2/6

=

OL.

Driv

ing

Axl

e Le

ft25

256

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

Inco

rrec

t P

ress

ure

Rea

ding

/ O

ver

or

Und

er

Infla

tion

of

Air

Bag

Com

pone

nt

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Key

Off-

Che

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2626

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4012054a




Figure 2.34

Figure 2.34

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Trai

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Ove

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Trai

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Trai

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4012055a




Figure 2.35

Figure 2.35

24V

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SID

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Acc

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nd 2

4v.

4012056a




Figure 2.36

Figure 2.36

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

So

len

oid

Val

ves

Fron

t Axl

e R

ight

(2

/2 S

olen

oid

Val

ve)

11

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vol

tage

is o

ff,

disc

onne

ct a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

15–

X2/

4 =

60-

90 o

hms.

If th

e re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/15

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/15

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/15

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Fron

t Axl

e R

ight

(2

/2 S

olen

oid

Val

ve)

11

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on:

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vol

tage

is o

ff,

disc

onne

ct a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

15–

X2/

4 =

60-

90 o

hms.

If th

e re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/15

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/15

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/15

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012057a




Figure 2.37

Figure 2.37

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Fron

t Axl

e R

ight

(2

/2 S

olen

oid

Val

ve)

11

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vol

tage

is o

ff,

disc

onne

ct a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X2/

15–

X2/

4 =

60-

90 o

hms.

If r

eadi

ng

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

15 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

15 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

15 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Fron

t Axl

e Le

ft (2

/2 S

olen

oid

Val

ve)

22

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/12

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

12 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

12 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

12 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012058a




Figure 2.38

Figure 2.38

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Fron

t Axl

e Le

ft (2

/2 S

olen

oid

Val

ve)

22

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/12

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

12 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

12 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

12 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Fron

t Axl

e Le

ft (2

/2 S

olen

oid

Val

ve)

22

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/12

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

12 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

12 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

12 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012059a




Figure 2.39

Figure 2.39

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

33

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/13

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

13 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

13 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

13 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Driv

ing

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

33

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/13

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/13

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/13

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/13

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012060a




Figure 2.40

Figure 2.40

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

33

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/13

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/13

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/13

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/13

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)4

43

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/10

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

10 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

10 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

10 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012061a




Figure 2.41

Figure 2.41

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)4

45

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

( d

epen

ding

on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/10

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

10 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

10 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

10 -

X3/

2 =

OL.

K

ey O

ff -

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Driv

ing

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)4

46

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/10

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/10

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/10

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/10

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012062a




Figure 2.42

Figure 2.42

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Trai

ling

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

55

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f the

vol

tage

is o

ff,

disc

onne

ct a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X3/

6 –

X2/

4 =

60-

90 o

hms.

If th

e re

adin

g is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X3/

6 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X3/

6 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Trai

ling

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

55

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

3/6

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X3/

6 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X3/

6 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012063a




Figure 2.43

Figure 2.43

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Trai

ling

Axl

e R

ight

(2/

2 S

olen

oid

Val

ve)

55

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

3/6

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/6

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X3/

6 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X3/

6 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Trai

ling

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)6

63

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

3/1

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

1 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

3/1

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

3/1

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012064a




Figure 2.44

Figure 2.44

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Trai

ling

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)6

65

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3). I

f vol

tage

is o

ff,

disc

onne

ct a

ll va

lves

and

re-

chec

k.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X3/

1 –

X2/

4 =

60-

90 o

hms.

If r

eadi

ng

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

1 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

3/1

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

3/1

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

Trai

ling

Axl

e Le

ft (2

/2

Sol

enoi

d V

alve

)6

66

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on:

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

3/1

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/1

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X3/

1 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X3/

1 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012065a




Figure 2.45

Figure 2.45

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)7

73

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/11

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

11 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)7

75

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/11

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

11 -

X3/

2 =

OL.

K

ey O

ff -

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012066a




Figure 2.46

Figure 2.46

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Driv

ing

Axl

e Le

ft (3

/2

Sol

enoi

d V

alve

)7

76

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff - V

erify

the

resi

stan

ce fr

om X

2/11

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

11 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

11 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

11 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Lifti

ng/T

raili

ng

Axl

e (3

/3

Sol

enoi

d V

alve

)8

83

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/14

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/14

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/14

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012067a




Figure 2.47

Figure 2.47

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Lifti

ng/T

raili

ng

Axl

e (3

/3

Sol

enoi

d V

alve

)8

85

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

14 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Lifti

ng/T

raili

ng

Axl

e (3

/3

Sol

enoi

d V

alve

)8

86

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

14 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

4012068a




Figure 2.48

Figure 2.48

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Low

er L

iftin

g/Tr

ailin

g A

xle

(3/3

Sol

enoi

d V

alve

)

99

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

14 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Low

er L

iftin

g/Tr

ailin

g A

xle

(3/3

Sol

enoi

d V

alve

)

99

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

2/14

- c

hass

is g

roun

d =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/14

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/14

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012069a




Figure 2.49

Figure 2.49

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Fron

t Axl

e C

entr

al (

3/2

Sol

enoi

d V

alve

)44

445

Low

cur

rent

or

open

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

the

all v

alve

s an

d re

-che

ck.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off

- Ver

ify th

e re

sist

ance

from

X3/

2– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

2 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/12

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/12

- X

3/2

= O

L.

Key

Off

- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Fron

t Axl

e C

entr

al (

3/2

Sol

enoi

d V

alve

)44

446

Cur

rent

too

high

or

sho

rt c

ircui

t to

gro

und

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

the

all v

alve

s an

d re

-che

ck.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off-

Ver

ify th

e re

sist

ance

from

X3/

2– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X3/

2 -

chas

sis

grou

nd =

OL.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e fr

om X

2/4

- X

2/12

=O

L --

> X

2/4

- X

3/2

=O

L --

> X

2/12

- X

3/2

= O

L.

Key

Off-

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012070a




Figure 2.50

Figure 2.50

24V

Fau

ltS

PN

SID

FM

ID

escr

ipti

on

Lam

pR

eact

ion

Cau

seA

ctio

n/C

hec

ks

Low

er L

iftin

g/Tr

ailin

g A

xle

(3/3

Sol

enoi

d V

alve

)

99

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

all

valv

es a

nd r

e-ch

eck.

W

ith th

e ch

assi

s ha

rnes

s re

conn

ecte

d, d

isco

nnec

t the

X/2

and

X/3

co

nnec

tors

. K

ey O

ff- V

erify

the

resi

stan

ce fr

om X

2/14

– X

2/4

= 6

0-90

ohm

s. If

the

read

ing

is o

ut o

f spe

c, c

heck

at t

he v

alve

: Res

ista

nce

from

pin

2-3

= 6

0-90

ohm

s an

d 4-

3 =

60-

90 o

hms.

K

ey O

ff- W

ith X

/2 -

X/3

EC

U c

onne

ctor

s di

scon

nect

ed a

nd th

e va

lve

disc

onne

cted

. Che

ck r

esis

tanc

e to

gro

und:

X2/

4 -

chas

sis

grou

nd =

OL

-->

X2/

14 -

cha

ssis

gro

und

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

14 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

14 -

X3/

2 =

OL.

K

ey O

ff- C

heck

eac

h pi

n on

the

valv

e to

cha

ssis

gro

und:

Pin

1- c

hass

is

grou

nd =

OL

-->

Pin

2- c

hass

is g

roun

d =

OL

-->

Pin

3- c

hass

is g

roun

d =

O

L --

> P

in4-

cha

ssis

gro

und

= O

L.

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

3434

3O

verv

olta

ge o

r sh

ort c

ircui

t to

+U

batt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify v

olta

ge o

n th

e ch

assi

s ha

rnes

s fr

om p

in 2

- to

cha

ssis

=

4v -

7v

and

4 -

to c

hass

is =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3).

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

3434

5Lo

w c

urre

nt o

r op

enR

ed L

amp/

C

heck

EC

AS

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- t

o ch

assi

s =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3).

Com

mon

S

olen

oid

Val

ve P

ower

C

onne

ctio

n

3434

6C

urre

nt to

o hi

gh

or s

hort

circ

uit

to g

roun

d

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- t

o ch

assi

s =

4v

- 7v

(de

pend

ing

on O

EM

vs

Afte

rmar

ket

inst

alla

tion,

vol

tage

may

be

foun

d on

ly o

n pi

n 2-

3).

Fron

t Axl

e C

entr

al (

3/2

Sol

enoi

d V

alve

)44

443

Ove

rvol

tage

or

shor

t circ

uit t

o +

Uba

tt

Red

Lam

p/

Che

ck E

CA

S

No

Cha

rgin

g/

Ven

ting

Com

pone

nt

or H

arne

ss

Failu

re/

Dam

age/

C

orro

sion

Dis

conn

ect a

t the

val

ve a

nd in

spec

t bot

h co

nnec

tor

and

com

pone

nt fo

r da

mag

e, c

onta

min

atio

n or

cor

rosi

on.

Key

On-

Ver

ify th

e vo

ltage

on

the

chas

sis

harn

ess

from

pin

2 -

to c

hass

is

= 4

v -

7v a

nd 4

- to

cha

ssis

= 4

v -

7v (

depe

ndin

g on

OE

M v

s A

fterm

arke

t in

stal

latio

n, v

olta

ge m

ay b

e fo

und

only

on

pin

2-3)

. If t

he v

olta

ge is

off,

di

scon

nect

the

all v

alve

s an

d re

-che

ck.

With

the

chas

sis

harn

ess

reco

nnec

ted,

dis

conn

ect t

he X

/2 a

nd X

/3

conn

ecto

rs.

Key

Off

- Ver

ify th

e re

sist

ance

from

X3/

2– X

2/4

= 6

0-90

ohm

s. If

rea

ding

is

out

of s

pec,

che

ck a

t the

val

ve: R

esis

tanc

e fr

om p

in 2

-3 =

60-

90 o

hms

and

4-3

= 6

0-90

ohm

s.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

to g

roun

d: X

2/4

- ch

assi

s gr

ound

= O

L --

> X

3/2

- ch

assi

s gr

ound

= O

L.

Key

Off-

With

X/2

- X

/3 E

CU

con

nect

ors

disc

onne

cted

and

the

valv

e di

scon

nect

ed. C

heck

res

ista

nce

from

X2/

4 -

X2/

12 =

OL

-->

X2/

4 -

X3/

2 =

OL

-->

X2/

12 -

X3/

2 =

OL.

K

ey O

ff -

Che

ck e

ach

pin

on th

e va

lve

to c

hass

is g

roun

d: P

in1-

cha

ssis

gr

ound

= O

L --

> P

in2-

cha

ssis

gro

und

= O

L --

> P

in3-

cha

ssis

gro

und

=

OL

-->

Pin

4- c

hass

is g

roun

d =

OL.

4012071a




Setting Vehicle Suspension Height Levels (Calibration)The ECAS ECU needs to know to what level the vehicle’s chassis must be during driving (normal ride height). In addition it also needs to know the highest and lowest possible chassis levels (upper and lower ride height). On buses, the kneeling levels also need to be set (kneeling level). The three primary vehicle suspension height levels selected by the manufacturer have to be set in the ECAS ECU memory using the diagnostic software. The three primary levels that need to be set are:

A. Normal Ride Level Height – level vehicle maintains during driving

B. Upper Level Height – highest possible suspension level

C. Lower Level Height – lowest possible suspension level

On buses and coaches, a kneeling level may also be required.

Vehicle PreparationObserve the following to prepare the vehicle.

� Park the vehicle on a level surface. Release the vehicle park and service brakes in order to prevent any distortion in the vehicle suspension. Block the wheels to prevent the vehicle from moving.

� Verify zero pressure sensor calibration.

� Verify Normal Level 1 (NL1) conforms to the vehicle’s designed normal ride level determined by the OEM.

� Check the counts displayed (Timer Tick/mm) to be optimized if appropriate.

� Using the diagnostic software tool and the arrows for charging and venting the bellows located in the start calibration screen, raise and lower the vehicle several times in order to adapt the level control system to the vehicle.

� Verify Normal Level 2 (NL2) to be defined per OEM specifications as vehicle low ride height.

� Verify Normal Level 3 (NL3) to be defined per OEM specifications as vehicle high ride height.

24V Vehicle Height Calibration Procedure Using PC Diagnostics1. To perform the Distance/Height Sensor Calibration, select

System from the pull-down menu, then select the Calibrate the distance sensors option. This will open the Start Calibration screen. Select OK in the pop-up CAUTION screen to continue. Figure 2.51.

Figure 2.51

2. Under Calibrate levels, select Start Calibration. The Start Calibration screen will be displayed with a Enter PIN/PIN2 SCREEN pop-up. Enter your PIN number in the PIN2 window and select OK. Figure 2.52 and Figure 2.53.

Figure 2.52

Figure 2.51

Figure 2.52

4010415a

4010416a




Figure 2.53

3. Select one axle, either front, rear or tag. Then select the left side, right side or both sides. Selecting the axles and sides will enable the selected air bellows to be inflated or deflated by the Charge and Vent keys. Select the desired air bellows and raise or lower the vehicle until the manufacturer’s normal ride level is measured. Figure 2.54.

Figure 2.54

4. Note the TT numbers and pressures for all axle locations. With the vehicle at the normal ride level, select the Save normal level button.

5. The screen will move to the Calibration of Upper Level Limit followed by Calibration of Lower Level Limit. Follow the same procedure as used for the Normal Ride Height Calibration in order to calibrate these levels.

6. If a bus kneeling level is to be calibrated, select Start calibration under Calibrate Kneeling Level. Under the Activate Levels, select the front axle and again raise or lower the axle using the Charge or Vent keys until the desired kneeling level is reached. Once the desired kneeling position is achieved, select Calibrate, then click OK. Figure 2.55.

Figure 2.55

7. Once all levels in the vehicle have been achieved and saved, select Finish Calibration. A pop-up screen will appear indicating a successful calibration. Figure 2.56.

Figure 2.56

Figure 2.53

Figure 2.54

4010417a

4010418a

Figure 2.55

Figure 2.56

4010369a

4010419a




12V Vehicle Height Calibration Procedure Using PC Diagnostics

Pin Free ECAS Calibration and Testing

WARNINGWhen activating components, cancelling or interrupting the function may result in automatic control occurring or trigger unexpected movements. Do not stand or place limbs near suspension or pinch points. The ECAS system will not function and both lamps will be illuminated until the system is calibrated.

1. Connect a computer with TOOLBOX™ Software 11.2 or higher to the vehicle and select ECAS CAN II (TRUCK AND BUS).

2. Select the Calibration button. Figure 2.57.

Figure 2.57

3. Read the pop-up Caution screen and click “OK” to continue. Figure 2.58.

Figure 2.58

4. Verify the connection in the upper left corner of the screen. The Status will display the base part number.

Verify Zero Pressure Sensor Calibration

1. To perform the zero pressure sensor calibration, select “START PRESSURE CALIBRATION”. Figure 2.59.

Figure 2.59

2. A pop-up will direct you to “Exhaust all air bags to calibrate the pressure sensors to 0 kPa”. Click “OK”.

3. This will automatically activate the “Rear Axle” and “Lifting Axle/Tag Axle” levels for pressure sensor calibration.

4. Lower the vehicle until the air bags are exhausted and save the values to the ECU. A pop-up will state that “Pressure values successfully saved to ECU”. Click “OK”. The values are now saved to the ECAS ECU.

Vehicle Height Calibration Procedure

1. To perform the Distance/Height Sensor Calibration, verify that both “Rear Axle “and “Lifting Axle/Tag Axle” levels are selected, then press “START HEIGHT CALIBRATION”. NOTE: You will not be able to proceed without selecting “Rear Axle” and “Lifting Axle/Tag Axle”. Figure 2.60.

Figure 2.57

Figure 2.58

4011361a

4011362a

Figure 2.59

4011363a




Figure 2.60

2. Normal Level Calibration

Using the “Charge” and “Vent” keys, raise or lower the vehicle until the manufacturer’s Normal Ride Level is measured. Note: To ensure a more accurate calibration, do not manually charge or vent the air bags without the TOOLBOX™ Software 11.0 or higher during calibration.

3. Select “SAVE NORMAL LEVEL” to save the calibration level.

4. Upper/Lower Level Calibration

The button and “STATUS” will continue to the Calibration of “Upper Level Limit” followed by “Calibration of Lower Level Limit”. Raise or lower the vehicle until the manufacturer’s Upper/Lower Level is measured. Note: To ensure a more accurate calibration, do not manually charge or vent the air bags without the TOOLBOX™ Software 11.0 or higher during calibration.

5. Select Save Upper then lower level to calibrate.

6. Complete the Calibration

Once all levels on the vehicle have been achieved and saved, select Finish Calibration. A pop-up screen will appear indicating a successful calibration.

7. The saved levels will be displayed in ticks, at the bottom of the screen under “Calibration Save Levels (TIMER TICKS)”. Figure 2.61.

Figure 2.61

Downloading Parameter and Calibration Settings from File to ECAS ECU

(Requires PIN Level ECU Access)

When replacing an OptiRide™ ECU, it may be necessary to reset the correct vehicle parameter and height calibration.

1. From the ECAS main screen, select System and from the drop-down menu, select ECU replacement. Figure 2.62.

Figure 2.62

2. The ECU Replacement screen will be displayed. This screen gives you the choice of saving data from the ECU to a file or data from a file to the ECU. To write data to the ECU, select the arrow extending from the laptop to the ECU. Figure 2.63.

Figure 2.60

4011364a

Figure 2.61

Figure 2.62

4011365a

4010420a




Figure 2.63

3. Select the appropriate file from the vehicle manufacture and select Open. Figure 2.64.

Figure 2.64

4. The next screen will ask for you to enter your PIN in the Enter PIN1 box. If it was previously entered, you will not be asked to enter it again. It will ask if the calibration values (pressure sensors, distance sensors, etc.) should also be written to the ECU. Only PIN 1 level can perform this operation. Figure 2.65.

Figure 2.65

5. The ECAS CAN2 Diagnostic Software dialog box will indicate if the data was successfully written to the ECU. Select OK.

Testing Components and Circuits

Test Instructions

WARNINGTo prevent serious eye injury, always wear safe eye protection when you perform vehicle maintenance or service.

CAUTIONWhen troubleshooting or testing the system at the ECU connectors, use caution not to damage the electrical connectors.

NOTE: Refer to the Volt-Ohm Meter (VOM) manufacturer’s instructions on how to use the VOM correctly.

1. Turn the vehicle ignition OFF.

2. Disconnect the appropriate connector from the ECAS ECU.

3. Check ECU part number and select the correct table.

4. Refer to the “Ignition Status” column of the table. If necessary, turn the vehicle’s ignition to the ON position. The vehicle engine does not need to be running.

5. Check that the air system pressure is above the compressor cut-in pressure.

Figure 2.63

Figure 2.64

4010370a

4010371a

Figure 2.65

4010372a




6. Set the VOM to the appropriate setting that will accommodate the expected range listed in the “Measurement/Reaction” column of the table.

7. For each step in the table, compare the VOM reading or reaction with the acceptable values or reactions listed in the “Measurement/Reaction” column. Write down the results of your comparisons.

8. Repair or replace wiring or components when the measurements or reactions do not meet the required results. Confirm that the repairs or replacement provides the correct required results.


3 Component Replacement


3 Component ReplacementHazard Alert MessagesRead and observe all Warning and Caution hazard alert messages in this publication. They provide information that can help prevent serious personal injury, damage to components, or both.


Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury can result.

CAUTIONDue to the active standby feature on the OptiRide™ ECAS, disconnect the height sensor or disconnect the OptiRide™ ECAS ECU prior to replacing or working on OptiRide™ ECAS components. Failure to do so may trigger unexpected movements.

Component Removal and Installation

ECU ReplacementReplacing the ECU requires ECAS calibration using the WABCO PC Diagnostic Program. The appropriate parameters selected for the vehicle may also need to be downloaded from a file obtained from the vehicle manufacturer. Refer to the instructions in Section 2.

NOTE: Refer to the vehicle manufacturer’s service literature for ECU location and removal/installation procedures.

Removal

1. Apply the parking brake and turn the ignition to the OFF position.

2. Place blocks under the front and rear wheels to prevent the vehicle from moving.

3. Remove any covers and/or equipment that restrict access to the ECAS ECU.

4. Disconnect the three wiring harness connectors from the ECAS ECU.

5. Remove any fasteners that attach the ECAS ECU to the vehicle. Remove the ECAS ECU.

Installation

1. Install the ECAS ECU using the manufacturer’s mounting hardware. Tighten the fasteners per the manufacturer’s recommendations.

2. Install the three wiring harness connectors to the ECAS ECU.

3. Replace any covers and/or equipment that were removed to gain access to the ECU.

4. Follow the ECAS calibration procedure described in Section 2.

5. When the ECAS calibration procedure is completed, the vehicle should be at the normal ride level and the ECAS lamp should be off.

6. Remove the blocks.

7. Test the ECAS installation.

Valve Block Replacement


Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury can result.

Release all air from the suspension system before you remove any components. Pressurized air can cause serious personal injury.

NOTE: Refer to the vehicle manufacturer’s service information for the ECAS valve location and removal/installation procedures.

Removal



3. If necessary, raise the vehicle off the ground and place safety stands under the chassis.

4. Note the location of the wiring connectors attached to the block and disconnect them.




5. Relieve air line pressure by bleeding all the air from the appropriate supply tank.

6. Mark the air lines for future reference when installing the new valve.

7. Disconnect the air lines from the valve block.

8. Loosen the mounting bolts that attach the valve block to the mounting bracket or the vehicle frame.

9. Remove the valve block.

Installation

1. Attach the new valve block to the mounting bracket or the vehicle frame.

2. Install the mounting bolts and tighten to 76 in-lb (8.5 N�m). @

3. Connect the air lines to the valve block as marked during the removal process.

4. Connect the wiring connectors to the valve block as noted during the removal process.

5. Test the valve functions. Refer to the vehicle manual to reference all ECAS functions such as normal ride height, raise and lower vehicle, etc. Figure 3.1 and Figure 3.2.

Figure 3.1

Figure 3.2

Height Sensor ReplacementThe ECAS height sensors are mounted between the vehicle chassis rails and the axle housing. WABCO currently supplies two types of height sensors. The older version has a replaceable lever arm and the newer version has a fixed lever arm. Figure 3.3. Replace a height sensor only if the diagnostic process indicates a faulty sensor or physical damage is present. Replacing a height sensor may require ECAS suspension height level recalibration using the PC diagnostic software program.

Removal



3. If necessary, raise the vehicle off the ground and place safety stands under the chassis.

4. Disconnect the wiring connector from the height sensor.

5. Disconnect the linkage rod from the lever arm. Note the position of the large ribs on the older-style sensor cylinder. The replacement sensor has to be mounted with the sensor cylinder in the same orientation.

Figure 3.1

Pin 1-Ch Valve Circuit 2-Ch Valve Circuit

1 3/2 Valve 3/2 Valve

2 Power 2/2 Valve


4 Power Power

4007213a

1

3

2

4

SOLENOID VALVE

Figure 3.2

Pin 1-Ch Valve Circuit 2-Ch Valve Circuit


2 Not Used 2/2 Valve


4 Power Power

4012650a

2

ECAS 4 VALVE HDSCS CONNECTOR

4

3

1




6. Remove the bolts that attach the height sensor to the mounting bracket on the chassis.

7. Remove the height sensor.

Installation

1. If replacing an older-style height sensor, attach the lever arm in the same orientation on the new sensor as it was on the sensor being replaced. Tighten the lever arm to 31 in-lb (3.5 N�m). When attaching the lever to the height sensor, the large ribs on the sensor cylinder must be aligned correctly with the lever. @

2. Position the sensor on the mounting bracket on the vehicle chassis.

3. Install the height sensor mounting bolts and tighten to 9 ft-lb (12 N�m) or the vehicle manufacturer’s specifications. @

4. Reattach the linkage rod to the lever arm.

5. Connect the wiring connector to the height sensor.

6. Check the vehicle normal ride level. If the vehicle does not return to the correct level, follow the ECAS Calibration procedure described in Section 2. Figure 3.3.

Figure 3.3

Pressure Sensor Replacement

Removal



3. Relieve air line pressure by bleeding all the air from the appropriate supply tank.

4. Mark the air lines for future reference when installing the new valve.

5. Disconnect the wiring connector from the pressure sensor.

6. Remove the pressure sensor from the air bellows fitting.

Installation

1. Attach the pressure sensor to air bellows fitting and tighten to specification.

2. Connect the air lines to the pressure sensor as marked during the removal process.

3. Connect the wiring connectors to the valve block as noted during the removal process.

4. Test the pressure sensor functions. Refer to the vehicle manual to reference all ECAS functions such as normal ride height, raise and lower vehicle, etc. Figure 3.4.

Figure 3.4

Figure 3.3

Pin Circuit

1 Signal to ECU

2 Ground from ECU

4012000a

HEIGHT SENSOR CONNECTOR

21

Figure 3.4

Pin Circuit

1 Power Supply

2 Ground

3 Pressure Signal

4007210a

1

3

2

PRESSURE SENSOR CONNECTOR


4 System and Component Diagrams


4 System and Component DiagramsDiagramsECU Part Number 446 170 210 0 Connection Scheme for Pressure Ratio

Figure 4.1

Figure 4.1

4010359a

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

5A

15A

Vcc, ignition

Vcc, battery

ground

CAN L

CAN H

- reserved -

- reserved -

- reserved -

- reserved -

- reserved -

- reserved -

- reserved -

- not used -

- not used -

- not used -

- not used -

Vcc

DISTANCE SENSORfront axle left

transverse acc. sensor

tag axle right

PRESSURE SENSORStag axle left

PRESSURE SENSORSrear axle right

tag axle right/lifting

central 3/2 front axle

tag axle left/lowering

rear axle left

front axle

sensors ground

pressure sensors Vcc

front axle right

rear axle right

solenoid valves Vcc

front axle right

lateral throttle

rear axle right

front axle left

central 3/2 rear axle

SOLENOID VALVESrear axle left

DISTANCE SENSORSrear axle left

SOLENOID VALVES

pin coding for secondECU address

pressure switch

HF-GND

X1

X1

1

2

3

10 10

11

12

13

14

15

4

5

8

9

1

7

2

3

3

1

2

6

3

4

5

7

8

9

7

12

1

2

3

4

5

6

17

16

13

15

11

8

14

9

18

4

5

6

7

8

9

10

11

12

13

14

15

X2

X2

X3

UP

1

2

3

4

5

6

7

8

9

X3

UP

UP

UP

UP

Ua




ECU Part Number 446 170 210 0 Connection Scheme for Pressure Equality

Figure 4.2

Figure 4.2

4010360a

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

5A

15A

Vcc, ignition

Vcc, battery

ground

CAN L

CAN H

- reserved -

- reserved -

- reserved -

- reserved -

Vcc, sidewalk

- reserved -

- reserved -

- not used -

- not used -

- not used -

- not used -

- reserved -

Vcc, sidewalk

R2

R3

R1

DISTANCE SENSORfront axle left

transverse acc. sensor

sidewalk detection

PRESSURE SENSORSrear axle right

tag axle right/lifting

central 3/2 front axle

tag axle left/lowering

rear axle left

front axle

sensors ground

pressure sensors Vcc

front axle right

rear axle right

solenoid valves Vcc

front axle right

lateral throttle

rear axle right

front axle left

central 3/2 rear axle

SOLENOID VALVESrear axle left

DISTANCE SENSORSrear axle left

SOLENOID VALVES

pin coding for secondECU address

pressure switch

HF-GND

X1

X1

1

2

3

10 10

11

12

13

14

15

4

5

8

9

1

7

2

3

3

1

2

6

3

5

4

8

9

7

12

1

2

3

4

5

6

17

16

13

15

11

8

14

9

18

4

5

6

7

8

9

10

11

12

13

14

15

X2

X2

X3

UP

1

2

3

4

5

6

7

8

9

X3

7

UP

UP

Ua




ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Truck

Figure 4.3

Figure 4.3

SWITCH CONTROL:

400 850 925 0

400 850 926 0

400 850 921 0

1 3 6 7 8 10 11 12 13 14 15 17 1 4 5 6 7 10 11 14 3 6 8

J1

939

HIG

H

J1

93

9 L

OW

TW

IST

ED

PA

IR

LO

AD

TR

AN

SF

ER

SW

ITC

H

IGN

ITIO

N +

10

A

BA

TT

ER

Y +

5A

GR

OU

ND

-

BA

TT

ER

Y P

OW

ER

FR

OM

EC

U

12V

IGN

SU

SP

EN

SIO

N R

AIS

E/L

OW

ER

SW

ITC

H

WA

RN

ING

/RID

E H

EIG

HT

LA

MP

AM

BE

R-N

ON

LE

D

IGN

*

RE

D-N

ON

LE

D

IGN

*

TAG PRESSURE SENSOR LEFT

3/2 TAG AXLE VALVE

1

2

3

1

2

3

DRIVE

AXLE AIR

BAG

DRIVE

AXLE AIR

BAG

HEIGHT

SENSOR

PRESSURE

SENSOR

TRAILING/TAG

AXLE VALVE

P/S

22 232411

3

4 21 3

22 232411

3

4 21 3

TAG

AXLE AIR

BAG

TAG

AXLE AIR

BAG

P/S

2 — REMOTE CONTROL GROUND

1 — REMOTE CONTROL POWER

4 — REMOTE CONTROL DATA

3 — REMOTE CONTROL CLOCK

DRIVE/TAG PRESSURE SENSOR POWER

DRIVE/TAG SOLENOID POWER

HEIGHT SENSOR REAR LEFT

DRIVE PRESSURE SENSOR LEFT

HEIGHT/PRESSURE SENSOR GROUND

2/2 DRIVE AXLE VALVE

3/2 DRIVE AXLE VALVE

2/2 TAG AXLE VALVE

1 2

4

3

X-2X-1

LOOKING INTO

CHASSIS HARNESS

CONNECTOR

X-3

21

LOOKING INTO CONNECTORS

SUPPLY AIR:

DELIVERY AIR:

DRIVE AXLE

VALVE

SECONDARY

AIR SUPPLY

PRESSURE

SENSOR

OPTIONAL TWOPOSITION

MOMEMTARYSWITCH TOGND-PIN 12

THREE POSITIONMOMENTARY SWITCHRAISE TO PWR-PIN 13LOWER TO GND-PIN 12

*Lamp ignition powersource must be separatefrom ECU ignition powersource. DO NOT connectto X1-10.

OptiRide™ ECAS is available with either remotecontrol or switches.

SAFETY/FAULT LAMP

REMOTE CONTROL:

400 850 923 0

400 850 924 0

400 850 919 0

4011999a

M1 M1

STOP

1

32

1

32

21

3 2

1 4

4

X3

17

5 28

6 39

3 2

1 4

7

X2

410

8 511

9 612

13

14

15

1

2

3

7

X1

410

8 511

9 612

13

14

15

16

17

18

1

2

3




ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Shuttle Bus (4x2)

Figure 4.4

Figure 4.4

4012651a

X1(18 PIN)

X2(15 PIN)X3

(9 PIN)

LAMPS SOLENOID VALVE 472 890 070 0

HEIGHT SENSORS 441 050 ...

97541115108

ECU

12

AA

A

71031175

8 6 9

4 4

5

1 73

1011

2

1314

-RE

SE

RV

ED

-

VC

C.

IGN

ITIO

N

VC

C.

IGN

ITIO

NV

CC

.IG

NIT

ION

SA

FE

TY

NO

RM

AL

LE

VE

L 1

/11

/111

SW

ITC

H R

AIS

ING

/LO

WE

RIN

G

CA

N L

OW

CA

N H

IGH

VC

C. IG

NIT

ION

VC

C. B

AT

TE

RY

GR

OU

ND

WA

RN

ING

LA

MP

RA

LE

FT

RA

LE

FT

SE

NS

OR

S G

RO

UN

D

VC

C.

SO

LE

NO

IDV

ALV

E

CE

NT

RA

L 3

/2

FA

FA

6.2

23 22 11

6.3

3

6.1

1 1

2

6.4

1 CENTRAL COLLECTING POINT, DISTANCE <1 M FROM ECU

HEIGHT SENSOR CABLES SHOULD BE TWISTED IN PAIRS

2 PIN 6.4 CONNECTED WITH 3

3 +UB FOR SOLENOID VALVES

4 ACCORDING TO SAE J1939

5 IGNITION

6 SOLENOID VALVE FRONT AXLE WITH CONNECTION TO PIN X 2/15

7 DISTANCE SENSOR FRONT AXLE WITH CONNECTION TO PIN X 2/9

8 SOLENOID VALVE REAR AXLE WITH CONNECTION TO PIN X 2/10

9 DISTANCE SENSOR REAR AXLE LEFT WITH CONNECTION TO PIN X 2/5

10 VALVE DELIVERY PORT 22 WITH CONNECTION TO FRONT AXLE BELLOWS

11 VALVE DELIVERY PORT 23 WITH CONNECTION TO REAR AXLE BELLOWS

ALL DECLARATIONS OF NOMINAL WIDTHS/CROSS SECTIONS ARE RECOMMENDATIONS.

A = 2.5 MM 2

ALL ELECTRIC WIRES WITHOUT DECLARATION OF CROSS SECTION A = 0.75 MM

ALL PIPES WITHOUT DECLARATION OF NOMINAL WIDTHS NW = 7 MM




ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Lift Axle Truck with ECAS 4 Valve

Figure 4.5

Figure 4.5

4012652a

8 11

DA

TA

CL

OC

K

10

IGN

ITIO

N K

EY

7

+ -12V

BA

TT

ER

Y

ELECTRONIC CONTROL UNIT 446 170 300 0



2 PIN 6.2 OR PIN 6.4 CONNECTED WITH 3



5 SEPARATE CONNECTION REQUIRED

6 IGNITION

PAR. 2.2 = 0 PAR. 2.2 = 1

7 PRESSURE SENSOR DRIVING AXLE WITH CONNECTION TO PIN X 2/6 PIN X 2/2

8 DISTANCE SENSOR DRIVING AXLE WITH CONNECTION TO PIN X 2/5 PIN X 2/8

9 SOLENOID VALVE DRIVING AXLE WITH CONNECTION TO PIN X 2/10 PIN X 2/13

10 PRESSURE SENSOR TRAILING AXLE WITH CONNECTION TO PIN X 3/3 PIN X 3/4

11 SOLENOID VALVE TRAILING AXLE WITH CONNECTION TO PIN X 2/14 PIN X 2/12

12 SWITCH PRESSURE RATION 1/11 FOR PARAMETER 13.6 = 0 PIN X 1/17

ALL DECLARATIONS OF NOMINAL WIDTHS/CROSS SECTIONS

ARE RECOMMENDATIONS.

ALL ELECTRIC WIRES WITHOUT DECLARATION OF CROSS

SECTION A = 0.75 MM


LEFT RIGHT

1 2 3 4

STOP

M1 M2

151312X1 51 2 3

LO

W

HF

-GN

D

HIG

H

CA

N

NO

RM

AL

LE

VE

L I

/II/

III

GR

OU

ND

+U

B

(SA

E J

1939)

446 056 ... .

14

WA

RN

ING

LA

MP

5A

15

A 2A

=2

.5 M

M

X2176

TR

AC

TIO

N H

EL

P

RA

ISIN

G/L

OW

ER

ING

FO

R P

AR

AM

ET

ER

13

.6 =

1

MA

X.2

W

5 6 14

DRIVING-

AXLE

10

DRIVING-

AXLE

44

1 0

44

...

.

1

23

1

3 2

11

UP

UP

34 7 1 6X3

NW10

2A

=2

.5 M

M

4 4 4 3

1

5

1

1

LIFTING-

AXLE

8

LEFT RIGHT

6

12

5

472 890 070 0

LIFTING-

AXLE

8 9111 10

23 22

472 890 076 0

6.4

1121

6.1

3

6.3

2

RIGHTLEFT

SA

FE

TY

LA

MP

MA

X.2

W

2A

=2

.5 M

M 7

4

LIF

T A

XL

E

3

6.16.3

6.4

6.2

23 22

1121

3

1

5

3

21

UP

LIFTING-

BELLOWS

51 9

6

LIF

TA

XL

E L

AM

PM

AX

.2W

441 050 ... .




ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Lift Axle Truck with ECAS 3 Valve

Figure 4.6

Figure 4.6

4012653a

8 11

DA

TA

CL

OC

K

10

IGN

ITIO

N K

EY

7

+ -12V

BA

TT

ER

Y








6 IGNITION

PAR. 2.2 = 0 PAR. 2.2 = 1









SECTION A = 0.75 MM


LEFT RIGHT

1 2 3 4

STOP

M1 M2

151312X1 51 2 3

LO

W

HF

-GN

D

HIG

H

CA

N

NO

RM

AL

LE

VE

L I

/II/

III

GR

OU

ND

+U

B

(SA

E J

1939)

446 056 ... .

14

WA

RN

ING

LA

MP

5A

15

A 2A

=2

.5 M

M

X2176

TR

AC

TIO

N H

EL

P

RA

ISIN

G/L

OW

ER

ING

MA

X.2

W

5 6 14

DRIVING-

AXLE

10

DRIVING-

AXLE

44

1 0

44

...

.

1

23

1

3 2

11

UP

UP

34 7 1 6X3

NW10

2A

=2

.5 M

M

4 4 4 3

1

5

1

1

TRAILING-

AXLE

8

LEFT RIGHT

6

5

472 880 074 0

TRAILING-

AXLE

8 9111 10

23 22

472 880 073 0

6.4

11216.2

6.1

3

6.3

2

RIGHTLEFT

SA

FE

TY

LA

MP

MA

X.2

W

2A

=2

.5 M

M 7

4L

IFT

AX

LE

3

6.16.3

6.4

6.2

23 22

1121

3

1

5

3

21

UP

LIFTING-

BELLOWS

51 9

6

LIF

TA

XL

E L

AM

PM

AX

.2W

441 050 ... .




ECU Part Number 446 170 300 0 Connection Scheme for 12-Volt Truck with ECAS 4 Valve

Figure 4.7

Figure 4.7

4012654a

8 11

DA

TA

CL

OC

K

10

IGN

ITIO

N K

EY

7

+ -12V

BA

TT

ER

Y








6 IGNITION

PAR. 2.2 = 0 PAR. 2.2 = 1






12 SWITCH PRESSURE RATION 1/11 FOR PARAMETER 13.6 = 0 PIN X 1/17




SECTION A = 0.75 MM


LEFT RIGHT

1 2 3 4

STOP

M1 M2

151312X1 51 2 3

LO

W

HF

-GN

D

HIG

H

CA

N

NO

RM

AL

LE

VE

L I

/II/

III

GR

OU

ND

+U

B

(SA

E J

1939)

446 056 ... .

14

WA

RN

ING

LA

MP

5A

15

A 2A

=2

.5 M

M

X2176

TR

AC

TIO

N H

EL

P

RA

ISIN

G/L

OW

ER

ING

FO

R P

AR

AM

ET

ER

13

.6 =

1

MA

X.2

W

5 6 14

DRIVING-

AXLE

10

DRIVING-

AXLE

44

1 0

44

...

.

1

23

1

3 2

11

UP

UP

34 7 1 6X3

NW10

2A

=2

.5 M

M

4 4 4 3

1

5

1

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© 2018 WABCO North America – All rights reserved – MM-1315 / 08.2018

About WABCO

WABCO (NYSE: WBC) is the leading global supplier of braking control systems and other advanced technologies that improve the safety, efficiency and connectivity of commercial vehicles. Originating from the Westinghouse Air Brake Company founded nearly 150 years ago, WABCO is powerfully “Mobilizing Vehicle Intelligence” to support the increasingly autonomous, connected and electric future of the commercial vehicle industry. WABCO continues to pioneer innovations to address key technology milestones in autonomous mobility and apply its extensive expertise to integrate the complex control and fail-safe systems required to efficiently and safely govern vehicle dynamics at every stage of a vehicle’s journey – on the highway, in the city and at the depot. Today, leading truck, bus and trailer brands worldwide rely on WABCO’s differentiating technologies. Powered by its vision for accident-free driving and greener transportation solutions, WABCO is also at the forefront of advanced fleet management systems and digital services that contribute to commercial fleet efficiency. In 2018, WABCO reported sales of over $3.8 billion and has more than 16,000 employees in 40 countries. For more information, visit www.wabco-na.com.

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optiride electronically controlled air suspension (ecas

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