toyotahondanissan code scanner cp9025_english

8/8/2019 ToyotaHondaNissan Code Scanner CP9025_english

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Congratulations on purchasing yourActron Code Scanner for accessingengine trouble codes required forrepairing vehicles equipped withcomputers. Your Actron Code Scanner ismade by Actron, the largest and mosttrusted name in automotive diagnosticequipment for the home mechanic. You

can have confidence this productmaintains the highest quality inmanufacturing, and will provide youyears of reliable service.This instruction manual is divided intoseveral key sections. You will finddetailed steps on using the CodeScanner and important informationabout trouble code meanings, how a

computer controls engine operation, andmore!Identifying the problem is the first step insolving that problem. Your Actron CodeScanner can help you determine byaccessing the engine computer troublecodes. Armed with that knowledge, youcan either refer to an appropriate servicemanual or discuss your problem with a

knowledgeable service technician. Ineither event you can save yourself a lotof valuable time and money in autorepair. And feel confident that yourvehicles problem has been fixed!

Actron offers a compete

line of high qualityautomotive diagnostic and

repair equipment.See your local Actron

dealer for other Actron products.

CONTENTS

1 About Codes ................................... 32 When to Read Codes ..................... 53 Using Codes ................................... 7

TOYOTA SECTION4 Vehicle Preparation ........................ 95 Reading Codes............................. 116 Code Meanings ............................ 22

HONDA SECTION

7 Vehicle Preparation ...................... 288 Reading Codes............................. 309 Code Meanings ............................ 40

NISSAN SECTION10 Vehicle Preparation ...................... 4311 Reading Codes............................. 46

12 Code Meanings ............................ 72

REFERENCE SECTION13 Computer Basics .......................... 7414 Glossary ....................................... 79

CP9025

Instruccines en espaol ....... 89

Instructions en franais ....... 177


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About CodesWhere do they come from and what are they for?

Engine computers can find problemsThe computer system in todays vehiclesdoes more than control engine operation - itcan help you find problems, too! Specialtesting abilities are permanently pro-grammed into the computer by factoryengineers. These tests check the compo-nents connected to the computer which areused for (typically): fuel delivery, idle speed

control, spark timing and emission systems.Mechanics have used these tests for years.Now you can do the same thing by usingthe Actron Code Scanner!

Engine computers perform special testsThe engine computer runs the specialtests. The type of testing varies withmanufacturer, engine, model year etc.There is no universal test that is the samefor all vehicles. The tests examine INPUTS (electrical signals going INTO thecomputer) and OUTPUTS (electricalsignals coming OUT of the computer).Input signals which have wrong values oroutput circuits which dont behave correctlyare noted by the test program and theresults are stored in the computersmemory. These tests are important. Thecomputer can not control the engineproperly if it has bad inputs or outputs!

Code numbers give test resultsThe test results are stored by using codenumbers, usually called trouble codesor diagnostic codes. For example, a

code 23 might mean throttle positionsensor signal voltage is incorrect. Codemeanings are listed in Sections 6, 9 and12. Specific code definitions vary withmanufacturer, engine and model year, soyou may want to refer to a vehicleservice manual for additional informa-tion. These manuals are available fromthe manufacturer, other publishers oryour local public library. (See manuallisting on page 4.)

Read Codes with the Code Scanner You obtain trouble codes from the engine computer memory by using the Actron Code Scanner tool. Refer to section 5, 8 or 11 for details. After you get the trouble codes, you can either: Have your vehicle professionally

serviced. Trouble codes indicateproblems found by the computer.or,

Repair the vehicle yourself using troublecodes to help pinpoint the problem.

Trouble Codes and Diagnostics helpyou fix the problemTo find the cause of the problem yourself,

you need to perform special testprocedures called diagnostics. Theseprocedures are in the vehicle servicemanual. There are many possible causesfor any problem. For example, supposeyou turned on a wall switch in your homeand the ceiling light did not turn on. Is it abad bulb or light socket? Is the bulbinstalled correctly? Are there problemswith the wiring or wall switch? Maybethere is no power coming into the house!As you can see, there are many possiblecauses. The diagnostics written forservicing a particular trouble code takeinto account all the possibilities. If youfollow these procedures, you should beable to find the problem causing the codeand fix it if you want to do-it-yourself.

Actron makes it easy to fix computer-controlled vehiclesUsing the Actron Code Scanner toobtain trouble codes is fast and easy.Trouble codes give you valuableknowledge whether you go forprofessional vehicle servicing or do-it-yourself. Now that you know whattrouble codes are and where they comefrom, you are well on your way to fixingtodays computer controlled vehicles!


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Vehicle Service InfoThe following is a list of publishers who have service manuals for your specificvehicle. Write or call them for availability and prices, specifying the make, style, modelyear, and VIN (Vehicle Identification Number) of your vehicle.

Vehicle Service Manuals

Chilton Book CompanyChilton WayRadnor, PA 19089

Haynes Publications861 Lawrence DriveNewbury Park, CA 91320

Electronic Engine ControlsFuel Injection and Feedback Carbure-torsFuel Injection and Electronic EngineControlsEmissions Control Manual...or similar titles

Cordura PublicationsMitchell Manuals, Inc.Post Office Box 26260San Diego, CA 92126

Motors Auto Repair ManualHearst Company250 W. 55th StreetNew York, NY 10019

Vehicle Service Manualsfrom Toyota, Honda,Nissan:

Toyota Motor CorporationToyota Service Publications750 W. Victoria St.Compton, CA 90220-5538

Honda Motor Co., Ltd.Helm IncorporatedPost Office Box 07280Detroit MI 48207

Nissan North America, Inc.Dyment Distribution ServicesC/O Nissan20770 Westwood DriveStrongsville, OH 44136


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When to Read CodesUse the Code Scanner to read computer

trouble codes if...

The Check Engine light comes ONor,

Vehicle engine is running poorly (forvehicles without a CHECK ENGINELIGHT.

The Check Engine lightThe CHECK engine dashboard lighttells you when to use the Code Scannertool.

The light may be colored amber or red,labeled with a small engine picture,called CHECK ENGINE, PGM-FI, orPGM-CARB on some vehicles.

What the CHECK Engine LightDoes

when no problem is spotted Normal operation: Light OFF when the engine is

RUNNING .This means the computer sees no

problem at the present time. Light ON - when the ignition key is inthe ON position, but the engine isOFF . (For example, before you startthe engine.) This is a normal test of alldashboard message lights. (Depend-ing upon vehicle, light will go out after2 seconds or when engine is started.)

If the CHECK engine light does not

come on, you have a problem which needs repair. Refer to your vehicle service manual. Look in sections called

Computerized Engine Controls,Electronic Engine Controls, Tune-Up Information or similar.

What the CHECK Engine LightDoes

when a problem is spotted!

Light ON and stays ON (when theengine is RUNNING )

The computer sees a problem thatdoes not go away. (A hard failure.)

The light will stay on as long as theproblem is present.

A trouble code is stored in computermemory. (A hard code.)

Use the Code Scanner at theearliest convenient time to obtain thecode.

or Light ON and then goes OFF (when

the engine is RUNNING ) The computer saw a problem, but

the problem went away. (Anintermittent failure.)

A trouble code is stored in computermemory. (An intermittent code.)

The light went out because theproblem went away, but the codestays in memory.

Use the Code Scanner at theearliest convenient time to obtain thecode. Note that the computer will

automatically erase codes afterseveral restarts (typically 30 to 100)if the problem does not return.(Exception: some early Hondasystems do not have this automaticcode erase feature.)

A Poorly Running Engine

Some vehicles do not have a CHECKengine light to let you know when troublecodes are stored. If your engine is


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running poorly, problems in the computersystem MAY be the cause.See if any of the following symptomsapply to your vehicle. Is the gas mileage significantly lower

than it should be?

Is it hard to start cold?, hot?, always? Has it recently failed an emissions

test? Does it falter or stumble when

accelerated? Does it lunge or surge while trying to

maintain a steady speed? Has it lost power?

Always check the simple things first: Is the air filter clean? A dirty air filter

will degrade engine performance. Are all vacuum hoses correctly

installed and in good condition? Have the spark plugs, spark plug

wires, distributor cap, and rotor (ifused) been changed according to the

manufacturers recommendations? Is the tire pressure correct? Low tirepressure can affect power and gasmileage.

Make any necessary repairs beforeproceeding to read trouble codes.

Code Scanner ToolsThe tools illustrated below are part of theCode Scanner package. The CodeReading sections of this manual listprocedures and tell you what tools arerequired.

TOYOTA section starts on page 9HONDA section starts on page 28NISSAN section starts on page 43

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TOYOTACP9025


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Using CodesUsing Trouble Codes to Pinpoint Problems

There are two types of codes Hard codes - codes for problems

which are present now .Hard problems make the CheckEngine light come on and stay on. Atrouble code is stored in computermemory. The light will stay on as longas the problem is present.

Intermittent codes - codes forproblems which happened in thepast, but are not happening now.

When the problem first appears theCheck Engine light will come on and atrouble code will be stored in computermemory. When the problem goes away,the light will turn off, but the code willstay in memory.

You troubleshoot the hard problemsdifferently from the intermittent ones.Do a thorough visual and hands-on underhood inspection before starting any diagnostic procedure!!

Dealing with Hard CodesThese codes are for problems which are

happening now. Refer to the vehicle service manualdiagnostic code charts.

Follow all the steps in the diagnosticprocedure for the trouble code.

Mechanical problems often generatetrouble codes! Be sure to inspect themechanical things suggested in thediagnostic procedures. Mechanicalproblems can make a good sensorsend an incorrect signal to thecomputer.

Do a thorough visual and hands-onunderhood inspection before startingany diagnostic procedure! You canoften find the problem cause and fix itby doing this. (See InspectionChecks.)

Be sure to erase the trouble codesfrom computer memory after

completing repair work. (Refer toErasing Trouble Codes after Repairin the Reading Codes section foryour vehicle.)

Dealing with Intermittent CodesThese codes are for problems which happened in the past, but are not present now. Usually these problems are due to

loose connections or bad wiring. Theproblem cause can often be foundwith a thorough visual and hands-oninspection. (See Inspection Checksbelow.)

Refer to the vehicle service manualdiagnostic code section. You can not

use the code chart proceduresbecause they are for hard problems -those which are present now.However, the charts have suggestionsfor dealing with intermittents and cantell you where bad connections, etc.,might exist.

Be sure to erase the trouble codesfrom computer memory aftercompleting repair work. (Refer toErasing Trouble Codes after Repairin the Reading Codes section foryour vehicle.)

Inspection ChecksDoing a thorough visual and hands-onunderhood inspection before starting anydiagnostic procedure is essential!!You can find the cause of manydrivability problems by just looking,thereby saving yourself a lot of time. Has the vehicle been serviced recently?

Sometimes things get reconnected inthe wrong place, or not at all.

Dont take shortcuts. Inspect hosesand wiring which may be difficult to

see because of location beneath aircleaner housings, alternators andsimilar components.


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Inspect all vacuum hoses for: Correct routing. Refer

to vehicle servicemanual, or VehicleEmission ControlInformation(VECI)decal located in theengine compartment.

Pinches and kinks. Splits, cuts or breaks.

Inspect wiring for: Contact with sharp

edges. (Thishappens often.)

Contact with hotsurfaces, such asexhaust manifolds.

Pinched, burned or chafed insula-tion.

Proper routing andconnections.

Check electrical

connectors for: Corrosion on pins. Bent or damaged

pins. Contacts not properly seated in

housing. Bad wire crimps to terminals.

Problems with connectors are common

in the engine control system. Inspectcarefully. Note that some connectors usea special grease on the contacts toprevent corrosion. Do not wipe off!Obtain extra grease, if needed, fromyour vehicle dealer. It is a special typefor this purpose.

FRONTOF CAR

U.S.A.

EM

G GAP

YSTCE BOOSTER

HVACCRUISE

BRAKE BOOSTER

TO TRANSMODE

EGRVACREG

EGRVACREG

FUELPRESSREG.


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C H

Vehicle PreparationImportant: Complete ALL steps in this section before proceeding to Section 5,Reading Trouble Codes. (Exception: Vehicles with Super Monitor Display Do steps 1 through 6 only.)

1) Safety First! Set the parking brake. Put the shift lever in PARK or Neutral. Block the drive wheels. Make sure the ignition key is in the

OFF position.

2) Vehicle Engine Must be at NormalOperating Temperature.

Start engine and let idle until upperradiator hose is HOT and pressurizedand RPM has settled to warm engineidle speed.

Warning: Always operate vehicle inwell ventilated area. Exhaust gasesare very poisonous! Observe all safetyprecautions (see page 2).

Turn ignition key to OFF position.

3) Verify: Vehicle Battery Voltage is 11Volts, or More.

Note that battery voltage will probably beO.K. (above 11 volts) unless you havehad one of the following conditions:

Charging system failure. Is the redCHARGE light (may be labeled witha small battery picture) illuminated onthe instrument panel while the engineis running? If you have a voltagegauge on your instrument panel, is itindicating low voltage while the engineis running?

Battery sulfation. Internal chemicaldamage (sulfation) may occur if thebattery has been sitting for severalmonths without having been charged.

Extensive battery use without the engine running. Low battery voltagemay be caused by long periods ofcranking a no-start engine or havingelectrical accessories (lights, radio) onfor more than 1/2 hour.

Correct any problems in these areas

before proceeding.

4) Verify: Throttle is Fully Closed.Make sure the accelerator pedal is notbeing held open by a fast idle cam(carbureted engines only), driver footpressure, or any other means.

5) Verify: Transmission is in PARK orNeutral.

6) Verify: All Electrical Systems andAccessories are Turned OFF.

Also turn off vehicle air conditioner, ifpresent.

7) Test the CHECK Engine Light(Also called CHECK ENGINE , orlabeled with a small engine picture.)

CHECK

Turn the ignition key from the OFF tothe ON position, but do not start theengine!

Verify that the light turns ON. If the light does not turn on, you have

a problem with this circuit which mustbe repaired before proceeding. Referto the vehicle service manual. Some

publications have this information inbooks or sections called Computer-

TOYOTA


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ized Engine Controls, ElectronicEngine Controls or Tune-UpInformation.

Turn the ignition key OFF .

8) Find the Computer Test Connector

Referred to as the CHECK connector,the CHECK ENGINE connector, theENGINE CHECK connector, the EFIconnector, or the SERVICE connector.There are 2 types... Circular plastic:

This is usuallybright yellow (or

green), with 2contacts. It islocated in theengine compart-ment. Theconnector may betaped to the vehicle harness and fittedwith a protective rubber cap, or plugged into a protective rubber capmounted on a chassis part (such asan inner fender). This style connectoris found primarily on 1983 throughmost 1986 model year vehicles, andvans through 1989.

Rectangular plastic:This is usuallyblack or gray, with18 or 24 contacts.The connector hasa hinged coverlabeled DIAGNO-SIS , DIAGNOS-TIC, CHECK CONN , or similar. Theconnector is bracket mounted invarious locations such as:

inner fender fender wheel well

strut or shock tower behind battery or near power

distribution center (relay/fuse box) near ignition coil or air flow meter near wiper motor under drivers seat (Previa)

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TOYOTACP9025

9) Select the Proper Tool The black jumper wire is used with

the circular type test connector.

The code scanner tool isused with the rectangulartype test connector.

10) Have a Pencil andPaper Ready

This is for writing down allthe codes.

This completes the vehicle preparation.Proceed to Section 5, Reading Trouble Codes.

TOYOTA


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Reading CodesImportant: Complete ALL steps in Section 4, Vehicle Preparation before readingtrouble codes.Toyota uses various computerized engine control systems.

Trouble codes are read by counting flashes on the CHECK engine light (or usingthe Super Monitor Display). Use the chart below to find the code reading test procedure for your vehicle.

* Vehicle must have Super Monitor Display

Year Usage System TestPg.

1983 Camry, Celica, Starlet EFI 12

1984 Camry, Celica, Starlet, Truck, Van EFI 12

1985 Camry, Van EFI 12

Celica, Corolla (RWD), MR2, Pickup, 4Runner TCCS-E 14

Cressida*, Supra* TCCS-M 20

1986 Camry, Celica w/2S-E Engine, Corolla,(RWD), MR2, Pickup, Van, 4Runner TCCS-E 14

Celica w/3S-GE Engine TCCS-L 17


1987 Corolla GT-S (RWD) & FX-16 (FWD),MR2, Pickup, Van, 4Runner TCCS-E 14

Camry, Celica TCCS-L 17

Cressida*, Supra* TCCS-M 201988 4Runner, Pickup w/Turbocharged Engine TCCS-E 14

Camry, Celica, Corolla, Land Cruiser, MR2,Van, Pickup w/out Turbocharged Engine TCCS-L 17


1989 All models TCCS-L 17& newer

EFI Electronic Fuel Injection systemTCCS-E Toyota Computer Control System (Early version)TCCS-L Toyota Computer Control System (Later version)TCCS-M TCCS system with Super Monitor Display option

RWD = Rear Wheel Drive FWD = Front Wheel Drive

TOYOTA


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EFI System(Electronic Fuel Injection system)

1) Complete ALL steps in Section 4,Vehicle Preparation

2) Access Computer Test ConnectorRectangular type: Open hinged cover on connector. Some connectors use a special

grease on the contacts to preventcorrosion. Do not wipe off!

Circular type: Remove the protective rubber cap

from the connector.

3) Turn ignitionKey to ONPosition butDO NOTSTART THEENGINE

4) Install Code Scanning ToolRectangular test connector: Plug code scanner tool into connector.

Note: Tool does not completely coverall contacts in 24 pin type connector.This is normal.

The tool only fits ONE WAY into thetest connector

The tool will not harm the vehicleengine computer.

O F F

ON

Remove cap if present

T M

T O Y O

T A

C P 9 0 2 5

Circular test connector: Plug the black jumper wire into both

test connector contacts. The jumper wire will not harm the

vehicle engine computer.

5) Get Codes from the Flashing

CHECK Engine Light Count flashes to get trouble codes. Only single digit codes (1 through 8)

are used. There is a 1 second pause between

flashes.Example: code 3 looks like...

PAUSE

PAUSE

FLASH (1 sec. pause) FLASH (1 sec.pause) FLASH

There is a 3 second pause betweencodes.

After all codes are sent, the wholesequence is repeated. This continues

until the ignition key is turned OFF orthe code scanning tool is discon-nected.Note: This means a code 1 (systemO.K.) will appear as a single flashoccurring every 3 seconds.

Codes are sent in numeric order fromthe lowest number to the highest.

Example of code 3 only:

PAUSE PAUSE

FLASH - FLASH - FLASH(3 second pause, then start over again)

Example of code series 3 and 5:

PAUSE PAUSE

FLASH - FLASH - FLASH(3 second pause)

PAUSE PAUSE PAUSE PAUSE

FLASH - FLASH - FLASH - FLASH - FLASH(3 second pause, then start all over from

the very beginning)

TOYOTA


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After all trouble codes have beenwritten down, finish testing as follows:

6) Turn ignition key OFF

7) Remove Tool from Connector andReplace Connectors ProtectiveCover

The engine computer is now back tonormal.

What to do with the Trouble CodesLook up the code definitions listed inToyota Code Meanings.

At this point you can either: Have your vehicle professionally


Repair the vehicle yourself usingtrouble codes to help pinpoint theproblem. Refer to Section 3, Using

Codes. Be sure to erase any troublecodes from the computers memoryafter repairs are completed, asindicated below.

Erasing Trouble Codes after Repair Disconnect the link or remove the

indicated fuse for a minimum of 30seconds.

Camry: Remove the ECU +B 15amp fuse from the fuse block.

TEST RESULTS COMMENTS

No indication onCHECK enginelight

You have a problem with the diagnostic circuitwhich needs repair before using the code

scanner tools. Refer to vehicle service manual.

Code 1 only Computer does NOT find a problem. If drivesymptom persists, be sure to perform a thoroughunderhood inspection first. (Refer to page 7.)Then refer to vehicle service manual for trouble-shooting suggestions.

Any code(s) Computer found problems in vehicle. Refer toToyota Code Meanings, page 22.

Celica, & Truck: Remove the STOP 15 amp fuse from the fuse block.

Starlet: Disconnect the fusible link

(YELLOW connector) near thepositive (+) battery terminal. Van: Remove the EFI 15 amp fuse

from the fuse block. All the trouble codes are now erased

from computer memory! Replace fuse or link. You may have to

reset the vehicle clock, radio stations,and so on.

Important: The computer has alearning ability to take care of minorvariations in engine control operation.Whenever you erase the computermemory, the computer has to relearnvarious things. Vehicle performance maybe noticeably different until it relearns.This temporary situation is normal. Thelearning process takes place duringwarm engine driving.

TOYOTA


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TCCS-E(Toyota Computer Control System - Early version)

1) Complete ALL steps in Section 4,Vehicle Preparation2) Access Computer Test ConnectorRectangular type: Open hinged cover on connector. Some connectors use a special

grease on the contacts to preventcorrosion. Do not wipe off!

Circular type: Remove the protective rubber cap

from the connector.

3) Turn ignitionKey to ONPosition butDO NOTSTART THEENGINE


Note: Tool does not completely coverall contacts in 24 pin type connector.This is normal.

The tool only fits ONE WAY into thetest connector

The tool will not harm the vehicleengine computer.

O F F

ON

T M

T O Y O

T A

C P 9 0 2 5



test connector contacts. (Servicemanuals refer to these as the T andE terminals.)

The jumper wire will not harm thevehicle engine computer.

5) Get Codes from the FlashingCHECK Engine Light

Count flashes to get trouble codes. Only codes 1 through 14 are used.

There is a 1 second pause betweenflashes.

Example: code 3 looks like...

PAUSE PAUSE

FLASH (1 sec. pause) FLASH (1 sec.pause) FLASH

Two digit codes are sent as one longgroup of flashes. That is, a code 10would be 10 flashes in a row, a code12 would be 12 flashes in a row, andso on.

There is a 4.5 second pause betweencodes.

After all codes are sent, the wholesequence is repeated. This continuesuntil the ignition key is turned OFF orthe code scanning tool is discon-nected.Note: This means a code 1 (systemO.K.) will appear as a single flashoccurring every 4.5 seconds.



PAUSE PAUSE

FLASH - FLASH - FLASH

(4.5 second pause, then start over again)

TOYOTA


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Example of code series 3 and 5:

PAUSE PAUSE

FLASH - FLASH - FLASH(4.5 second pause)

PAUSE

PAUSE

PAUSE

PAUSE

FLASH - FLASH - FLASH - FLASH - FLASH(4.5 second pause, then start all over

from the very beginning)


6) Turn ignitionkey OFF O F F O N

T M

T O Y O

T A

C P 9 0 2 5

Replace cap

7) Remove Tool from Connector andReplace Connectors ProtectiveCover


What to do with the Trouble CodesLook up the code definitions listed inToyota Code Meanings.At this point you can either: Have your vehicle professionally


TEST RESULTS COMMENTSNo indication onCHECK enginelight

You have a problem with the diagnostic circuitwhich needs repair before using the codescanner tools. Refer to vehicle service manual.

Code 1 only Computer does NOT find a problem. If drivesymptom persists, be sure to perform athorough underhood inspection first. (Refer topage 7) Then refer to vehicle service manualfor troubleshooting suggestions.


Repair the vehicle yourself usingtrouble codes to help pinpoint theproblem. Refer to Section 3, UsingCodes. Be sure to erase any troublecodes from the computers memory

after repairs are completed, asindicated on the following page.

TOYOTA


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Erasing Trouble Codes after Repair Remove the indicated fuse for a

minimum of 30 seconds.

SECONDS

30

Corolla GT-S (RWD),1985 Celica, MR2, 1986 MR2 & 1987 Corolla FX-16 (FWD): Remove the STOP 15 amp fuse fromthe fuse block.

1985 Corolla (RWD) & 1987 MR2: Remove the AM2 7.5 amp fuse fromthe fuse block.

Camry, Celica, Pickup, Van, &4Runner: Remove the EFI 15 amp fuse fromthe fuse block.

All the trouble codes are now erasedfrom computer memory!

Replace fuse. You may have to resetthe vehicle clock, radio stations, andso on.

Important: The computer has alearning ability to take care of minorvariations in engine control operation.

Whenever you erase the computermemory, the computer has to relearnvarious things. Vehicle performance maybe noticeably different until it relearns.This temporary situation is normal. Thelearning process takes place duringwarm engine driving.

TOYOTA


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TCCS-L(Toyota Computer Control System - Later version)

1) Complete ALL steps in Section 4,Vehicle Preparation

2) Access Computer Test ConnectorRectangular type: Open hinged cover on connector. Some connectors use a special

grease on the contacts to prevent

corrosion. Do not wipe off!Circular type: Remove the protective rubber cap

from the connector.

3) Turn ignitionKey to ONPosition but

DO NOTSTART THEENGINE.


Note: Tool does not completely cover

all contacts in 24 pin type connector.This is normal. The tool only fits ONE WAY into the

test connector The tool will not harm the vehicle

engine computer.

O F F

ON

T M

T O Y O

T A

C P 9 0 2 5



test connector contacts. (Servicemanuals refer to these as the T andE terminals.)

The jumper wire will not harm thevehicle engine computer.

5) Get Codes from the FlashingCHECK Engine Light

NOTE: If no trouble codes are stored,the light will rapidly flash (about fourtimes a second). This means thecomputer has found no problem.

Count flashes to get trouble codes. All codes are 2 digits long. Each digit is a group of flashes.


PAUSE

FLASH (pause) FLASH FLASH(FLASH = 1, FLASH FLASH = 2.

Put 1 and 2 together = code 12.)


PAUSE

FLASH FLASH (pause)FLASH FLASH FLASH


After all codes are sent, the wholesequence is repeated. This continuesuntil the ignition key is turned OFF orthe code scanning tool is discon-nected.

TOYOTA


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Example of code series 11, 13 and 23:

PAUSE

FLASH (pause) FLASH(2.5 second pause,

then go to next code)

PAUSE

FLASH (pause) FLASH FLASH FLASH(2.5 second pause,

then go to next code)

PAUSE

FLASH FLASH (pause) FLASH FLASH FLASH(4.5 second pause, then start all over

again from the very beginning)


PAUSE

FLASH (pause) FLASH FLASH

(4.5 second pause,then start over again)

After all trouble codes have been writtendown, finish testing as follows:

O F F O N

T M

T O Y O

T A

C P 9 0 2 5

Replace cap

6) Turn ignitionkey OFF

7) Remove Toolfrom Connector and ReplaceConnectors Protective Cover


TEST RESULTS COMMENTS

No indication onCHECK engine

light

You have a problem with the diagnostic circuitwhich needs repair before using the code

scanner tools. Refer to vehicle service manual.

Rapidly flashingCHECK enginelight(About 4 times asecond)

Computer does NOT find a problem. If drivesymptom persists, be sure to perform athorough underhood inspection first. (Refer topage7.) Then refer to vehicle service manualfor troubleshooting suggestions.


TOYOTA


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What to do with the Trouble CodesLook up the code definitions listed inToyota Code Meanings.At this point you can either: Have your vehicle professionally


Repair the vehicle yourself usingtrouble codes to help pinpoint theproblem. Refer to Section 3, UsingCodes. Be sure to erase any troublecodes from the computers memoryafter repairs are completed, asfollows.

Erasing Trouble Codes after Repair Remove the indicated fuse for a

minimum of 30 seconds.

SECONDS

30

Camry, Celica, Cressida, Land Cruiser, 1991 & newer MR2, Paseo,Pickup, Previa, Supra, 1991 & newer Tercel, Van, & 4Runner: Remove the EFI fuse from the fuse

block. Corolla (ALL), & 1989, 1990 Tercel:

Remove the STOP fuse from thefuse block.

1988, 1989 MR2: Remove the AM2 fuse from the fuseblock.

All the trouble codes are now erasedfrom computer memory!

Replace fuse. You may have to resetthe vehicle clock, radio stations, andso on.

Important: The computer has alearning ability to take care of minorvariations in engine control operation.

Whenever you erase the computermemory, the computer has to relearnvarious things. Vehicle performance maybe noticeably different until it relearns.This temporary situation is normal. Thelearning process takes place duringwarm engine driving.

TOYOTA


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TCCS-M(Toyota Computer Control System with Super

Monitor Display option)

1) Complete Steps 1 Through 5 inSection 4, Vehicle Preparation

2) Turn ignitionKey to ONPosition butDO NOTSTART THE

ENGINE

3) Have Pencil and Paper Ready

4) Press and Hold the SELECT andINPUT M Keys at the Same Time

Press bothkeys for a

minimumof 3seconds .

The lettersDIAG willappear onthe Super Monitors display.

Wait a few seconds, then proceed tonext step.

5) Pressand Holdthe SETKey for atLeast 3Seconds

6) Read Trouble Codes on Display If there are no stored trouble codes,

the display will show E/G OK orENG -OK .

O F F

ON

O F F O N

S U P E R M O N I T O R

T I N P U T S E T

H M

SU P E R M O N IT O R

SE L EC T IN P U T SE T

H M

DIAG


S E LE CT IN PU T S E T

H M

ENG OK


S EL E C T I NP UT S ET

H M

ENG 32

Stored trouble codes are shown ondisplay as follows...

Example of code 32: Display will showE/G 32 or ENG -32 . All codes

are 2 digitslong.

Whenmore than1 code isstored,there willbe a 3 second pause between codes.


7) Press the SELECT Key to ShowTime

8) Turn ignitionkey OFF

The enginecomputer isnow back tonormal.

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Code MeaningsNote: Code meanings can vary with vehicle, model year, engine

type and options. If a code number has more than one definition listed, note

that only one definition applies to your vehicle. Consultservice manual to get the specific definition for your vehicle.

Each code definition includes a list of possible causes forthe code.

Follow vehicle service manual procedures to find the causeof the code.

Remember:1) Visual inspections are important!2) Problems with wiring and connectors are common,

especially for intermittent faults.3) Mechanical problems (vacuum leaks, binding or sticking

linkages, etc.) can make a good sensor send an incorrectsignal to the computer. This can cause a Trouble Code.

4) Incorrect information from a sensor may cause the computerto control the engine in the wrong way. Faulty engineoperation might even make the computer show a differentgood sensor as being bad!

System Pg. No.

EFI CodesElectronic Fuel Injection system ....................... 23

TCCS-E CodesToyota Computer Control System(Early version) .................................................. 24

TCCS-L CodesToyota Computer Control System(Later version) .................................................. 25

TCCS-M CodesTCCS system with Super MonitorDisplay option ................................................... 25

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EFI CodesElectronic Fuel Injection system

1System Normal -No malfunction.

2Airflow meter (AFM) signal- Bad Airflow meter, Mainrelay, EFI Main relay, orassociated meter/relaywiring.

3Airflow meter (AFM) - Bad

Airflow meter or meterwiring.

4Coolant Temperaturesensor signal - Bad Water(Coolant) Temperaturesensor, Main relay orassociated sensor/relaywiring.

5Oxygen (O 2) sensor signal- Air suction into Exhaustsystem. Leak in Air Inductionsystem or Air Intake system.Bad or fouled Spark Plug(s).Bad Vacuum sensor, O 2sensor(s), O 2 sensor Heater,Integrated Ignition Assembly(IIA), Air Flow meter, FuelInjector(s), Cold StartInjector or Cam Positionsensor. Improper Fuelpressure. Faulty Ignitionsystem, Distributor. Wiringassociated with these parts.

6Ignition signal - BadIgnition coil, Battery, Ignitionswitch, Neutral/start switchor Integrated IgnitionAssembly (IIA). Missing

Starter (STA) signal. Loss ofsignal from Distributor toECU. Faulty Distributor,Ignition System components.Wiring associated with theseparts.

7Throttle Position Sensor(TPS) signal - Bad ThrottlePosition sensor, Main relay,Electronic Fuel Injection(EFI) Main relay, or faultysensor/relay wiring.

8Intake Air Temperaturesensor signal - Bad AirTemperature sensor, AirFlow meter, Main relay orfaulty sensor/meter/relaywiring.

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TCCS-E CodesToyota Computer Control System (Early version)

1System Normal - Nomalfunction.

2Airflow meter (AFM) signal- Bad Airflow meter, Mainrelay, EFI Main relay, orfaulty meter/relay wiring.

3Ignition signal - Bad Igniter,Ignition coil, Ignition switch,

Cam Position sensor,Ignition Main relay,Integrated Ignition Assembly(IIA), Cam Position sensor orDistributor. Wiringassociated with these parts.

4Coolant Temperaturesensor signal - Bad Water(Coolant) Temperature

sensor, Main relay or faultysensor/relay wiring.

5Oxygen (O 2) sensor signal- Air suction into Exhaustsystem. Leak in Air Inductionsystem or Air Intake system.Bad or fouled Spark Plug(s).Bad Vacuum sensor, O 2sensor(s), O 2 sensor Heater,

Integrated Ignition Assembly(IIA), Air Flow meter, FuelInjector(s), Cold StartInjector or Cam Positionsensor. Improper Fuelpressure. Faulty Ignitionsystem or Distributor. Wiringassociated with these parts.

6RPM signal - Bad Igniter,

Ignition Coil, Ignition switch,Cam Position sensor,Ignition Main relay,Integrated Ignition Assembly(IIA), Cam position sensor orDistributor. Wiringassociated with these parts.

7Throttle Position Sensor(TPS) signal - Bad Throttle

Position sensor, Main relay,Electronic Fuel Injection

(EFI) Main relay, or faultysensor/relay wiring.

8Intake Air Temperaturesensor signal - Bad AirTemperature sensor, AirFlow meter, Main relay orfaulty sensor/meter/relaywiring.

10Starter signal - Bad Starter,Battery, Ignition switch,Clutch switch, Clutch Startswitch, Clutch Starter relay,Starter relay, Main relay,Neutral/Start switch or faultywiring associated with theseparts.

11Electronic Control Unit(ECU) Power supply (B+) -Bad Electronic Fuel Injection(EFI) relay, EFI Main relay,Main relay, Ignition switch orfaulty relay/switch wiring.or ,Switch signal - Bad AirConditioning (A/C) switch, A/ C Amplifier, Neutral/Startswitch, Throttle Positionsensor, Accelerator pedal orAccelerator Pedal cable.Faulty Throttle Positionsensor IDL circuit. Wiringassociated with these parts.or ,Main Relay & circuit - BadMain relay, Electronic FuelInjection (EFI) Main relay,Ignition switch or faulty relay/ switch wiring.

12RPM signal - Bad CamPosition sensor, Igniter,Ignition coil, Battery, Ignitionswitch, Clutch start switch,Neutral start switch, Starterrelay or Integrated IgnitionAssembly (IIA). MissingStarter (STA) signal. Loss ofsignal from Distributor toECU. Faulty Distributor orIgnition system components.

Wiring associated with theseparts.or ,

Knock sensor signal - BadKnock sensor or faultysensor wiring.

13RPM signal - Bad CamPosition sensor, Igniter,Ignition coil, Battery, Ignitionswitch, Clutch start switch,Neutral start switch, Starterrelay or Integrated IgnitionAssembly (IIA). MissingStarter (STA) signal. Loss ofsignal from Distributor toECU or faulty Distributor.Faulty Ignition systemcomponents. Wiringassociated with these parts.or ,Knock sensor Control -Bad Knock sensor control(ECU) or faulty sensorwiring.

14Ignition signal - BadIgniter, Ignition Coil, Ignitionswitch, Cam Positionsensor, Ignition Main relay,Main relay, IntegratedIgnition Assembly (IIA), Camposition sensor orDistributor. Wiringassociated with these parts.or ,

RPM signal - Bad CamPosition sensor, Igniter,Ignition switch or IntegratedIgnition Assembly (IIA).Faulty Distributor. Wiringassociated with these parts.or ,Turbo Pressure - Bad AirFlow meter. FaultyTurbocharger. Wiringassociated with these parts.

or ,Igniter & circuit - BadIgniter or Ignition switch.Faulty Distributor. Wiringassociated with these parts.

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TCCS-L CodesToyota Computer Control System (Later version)

and

TCCS-M CodesToyota Computer Control System with Super Monitor Display option

11Electronic Control Unit(ECU) Power supply (B+) -Bad Electronic Fuel Injection(EFI) relay, EFI Main relay,Main relay, Ignition switch orfaulty relay/switch wiring.or ,

Main Relay & circuit - BadMain relay, Electronic FuelInjection (EFI) Main relay,Ignition switch or faultyrelay/switch wiring.

12RPM signal - Bad CamPosition sensor, Igniter,Ignition coil, Battery, Ignitionswitch, Clutch start switch,

Neutral start switch, Starterrelay or Integrated IgnitionAssembly (IIA). MissingStarter (STA) signal. Loss ofsignal from Distributor toECU. Faulty Distributor orIgnition system components.Wiring associated with theseparts.

13RPM signal - Bad CamPosition sensor, Igniter,Ignition coil, Battery, Ignitionswitch, Clutch start switch,Neutral start switch, Starterrelay or Integrated IgnitionAssembly (IIA). MissingStarter (STA) signal. Loss ofsignal from Distributor toECU or faulty Distributor.Faulty Ignition system

components. Wiringassociated with these parts.

14Ignition signal - BadIgniter, Ignition Coil, Ignitionswitch, Cam Positionsensor, Ignition Main relay,Main relay, IntegratedIgnition Assembly (IIA) orCam position sensor. Faulty

Distributor. Wiringassociated with these parts.or ,

RPM signal - Bad CamPosition sensor, Igniter,Ignition switch or IntegratedIgnition Assembly (IIA).Faulty Distributor. Wiringassociated with these parts.or ,Igniter & circuit - BadIgniter or Ignition switch.Faulty Distributor. Wiringassociated with these parts.

16Electronic ControlledTransaxle (ECT) system -Bad ECT program (in ECU).

21Main Oxygen (O 2) sensor

signal - Leak in AirInduction system. Bad SparkPlugs, Fuel Injector(s), ColdStart Injector, Air Flowmeter, O 2 sensor or O 2sensor Heater. ImproperFuel pressure. FaultyDistributor or Ignitionsystem. Wiring associatedwith these parts.or ,

Oxygen (O 2) sensor signal- Air suction into Exhaustsystem. Leak in Air Inductionsystem or Air Intake system.Bad Spark Plug(s), Vacuumsensor, O 2 sensor(s), O 2sensor Heater IntegratedIgnition Assembly (IIA), AirFlow meter, Fuel Injector(s),Cold Start Injector or CamPosition sensor. Improper

Fuel pressure. FaultyIgnition system orDistributor. Wiringassociated with these parts.or ,Oxygen (O 2) sensor No.1signal - Air suction intoExhaust system. Air Intakesystem leak. Bad SparkPlug(s), Vacuum sensor, O 2sensor(s) or O 2 sensor

Heater, Integrated IgnitionAssembly (IIA), Air Flowmeter, Fuel Injector(s) or

Cold Start Injector. ImproperFuel pressure. Faulty Ignitionsystem or Distributor. Wiringassociated with these parts.

22Coolant Temperaturesensor signal - Bad Water

(Coolant) Temperaturesensor or faulty sensorwiring.or ,Coolant TemperatureSwitch signal - Bad Water(Coolant) Temperatureswitch(s) or faulty switchwiring.

23Throttle Position sensorsignal - Bad ThrottlePosition sensor or faultysensor wiring.or ,Intake Air Temperaturesensor - Bad Intake AirTemperature sensor, Mainrelay or faulty sensor/relaywiring.

24Intake Air Temperaturesensor signal - Bad AirTemperature sensor, AirFlow meter or faulty sensor/ meter wiring.or ,Air Temperature sensorcircuit - Bad AirTemperature sensor, Air

Flow meter or faulty sensor/ meter wiring.

25Lean Air/Fuel mixture - Bador blocked Fuel Injector(s).Bad Coolant Temperaturesensor, Air Flow meter,Vacuum sensor, ElectronicAir Bleed Control Valve(EBCV), Electronic Air

Control Valve (EACV) or O 2sensor. Improper Fuel linepressure. Faulty Carburetor,

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51Switch Condition - Bad AirConditioning (A/C) switch, A/ C Amplifier, Neutral/Startswitch, Throttle Positionsensor, Accelerator pedal orAccelerator pedal cable.Wiring associated with these

parts.or ,Switch signal - Bad AirConditioning (A/C) switch orA/C Amplifier, Neutral/Startswitch, Throttle Positionsensor, Accelerator pedal orAccelerator Pedal cable.Wiring associated with theseparts.or ,Air Conditioning (A/C)signal - Bad A/C Amplifieror faulty amplifier wiring.

52Knock sensor signal - BadKnock sensor or faultysensor wiring.

53Knock sensor Control -Faulty Knock sensor control(ECU) or associated wiring.or ,Knock Control - FaultyKnock control (ECU) orassociated wiring.

54Intercooler ECU Signal -Improper Intercooler Coolantlevel. Bad Intercooler Waterpump or Coolant levelsensor. Faulty IntercoolerECU. Wiring associated withthese parts.

55Knock sensor - Bad Knocksensor or sensor wiring.

71Exhaust Gas Recirculation(EGR) system - Bad EGRGas Temperature sensor orEGR Valve. Faulty EGRhose(s), EGR system orfaulty sensor/EGR wiring.

72Fuel Cut solenoid signal -Bad Fuel Cut solenoid orfaulty solenoid wiring.

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Vehicle PreparationComplete ALL steps in this section before proceeding to Reading TroubleCodes.IMPORTANT: Reading trouble codes on 1985 - 1990 (all models) and 1991 Civic,

CRX, & Prelude models, requires access to the engine computer. Due to varyingmounting locations and methods, some mechanical disassembly may berequired! Refer to the Computer Location table in step 3 below. If you are unfamiliaror uncomfortable with the disassembly required, you may want to get help fromanother person before proceeding.

1) Safety First! Set the parking brake. Put the shift lever in PARK or Neutral. Block the drive wheels. Make sure all accessories are turned

OFF Make sure the ignition key is in the

OFF position.

2) Test the PGM-FI Light

(Also calledCHECK , with asmall enginepicture, or PGM-CARB.)

Turn the ignitionkey from the OFF to the ON position,but do not start the engine!

Verify that the light turns ON for 2

seconds . If the light does not turn on, you have

a problem with this circuit whichshould be repaired. Refer to thevehicle service manual. Somepublications have this information inbooks or sections called Computer-ized Engine Controls, ElectronicEngine Controls or Tune-Up

Information. Turn the ignition key OFF .

IMPORTANT: 1985-1990 (all models) and

1991 Civic, CRX, Prelude: Go to step 3.

All other models: Go to step 5.

PGM-FI

3) Locate the Engine ComputerNote: Hondarefers to the

enginecomputer asthe ECU(ElectronicControl Unit).

Accord, 1985 - 1990Under drivers seat

Accord, 1991 - 1992Under front passengers footwell(beneath the carpeting, below thedashboard)

Civic, 1988 - 1991Under front passengers footwell(beneath the carpeting, below thedashboard)

Civic, 1992Behind front passengers kick panel(right of passengers right foot)

Civic Si 1986 - 1987Under front passenger seat

Civic CRX Si, 1985-1987Under front passenger seat

Civic CRX Si, 1988Under front passengers footwell(beneath the carpeting, below thedashboard)

CRX, 1989 - 1991Under front passengers footwell(beneath the carpeting, below thedashboard)

Prelude, 1986 - 1987Behind left (drivers) side rear seattrim panel

Prelude, 1988 - 1992Under front passengers footwell(beneath the carpeting, below thedashboard)


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4) Access the Computer for Testing

8 4 2 1

Trouble codes are read by notingwhich LEDs are ON (4 LED system)or by observing the flash pattern of asingle LED (1 LED system). TheseLEDs are mounted inside thecomputer. They can be seen through asight window (an opening in thecomputer housing) or reflected by a

small mirror in some cases. Remove any vehicle parts such as

kick panels or other plastic pieceswhich would restrict access to theLED sight window. Carefully turn backthe carpeting if necessary.

The computer itself may have to beremoved from its mounting location. Make note of wire harness position

before moving computer. Harness should be replaced in original position when computer remounted.

Do not disconnect any of thewiring harness connectors whichplug into the computer. You maylose stored trouble codes!

5) Have pencil, and paper on hand These are for writing down all the

codes.This completes the vehicle preparation.Proceed to Reading Trouble Codes,page 30.


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Reading CodesImportant: Complete ALL steps in Vehicle Preparation before reading troublecodes. Honda uses various computerized engine control systems.

Trouble codes are read by: Observing LEDs (Light Emitting Diodes) built into the engine computerOR ...

Counting flashes on the CHECK engine light. Use the chart below to find the code reading test procedure for your vehicle.

Remember: Vehicles using the instrument panel (CHECK engine) lamp for reading trouble codes do NOT require engine computer access.

Year Usage System Test Pg.

1985 Accord SEi, Civic CRX Si 4 LED 32

1986 Accord LXi, Prelude (all) 1 LED 34Civic CRX Si, Civic Si 4 LED 32

1987 Accord LXi, Prelude (all) 1 LED 34Civic CRX Si, Civic Si 4 LED 32

1988 Accord LXi, Civic (all), Civic CRX Si,Prelude (all) 1 LED 34

1989 Accord LXi, Civic (all), CRX, Prelude (all) 1 LED 34

1990 Accord (all), Civic (all), CRX, Prelude (all) 1 LED 34

1991 Accord (all) panel lamp 37Civic (all), CRX, Prelude (all except 2.1 Liter) 1 LED 34Prelude with 2.1 Liter 1 LED 37

1992 All models panel lamp 37

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SPECIAL NOTE:Vehicles With Electronically Controlled Automatic Transaxles

After engine control system repair,clear the automatic transaxlecomputers memory by removing the

appropriate fuse for 15 seconds. Test drive the vehicle, then re-check

the engine control system for troublecodes. In many cases, once theengine control system failure isrepaired, the transaxle trouble codewill also disappear.

If the transaxle trouble code is noteliminated, then proceed with a self-diagnostic check on the automatictransaxle as outlined in the vehicleservice manual.

Some vehicles have computercontrolled automatic transaxles(transmissions).

Typically these transmissions are self-diagnosing, similar to the enginecontrol systems covered in thissection.

Note that certain engine controlsystem failures may also cause theS, D, or D4 transmission indicatorlamp to flash along with the CHECKEngine lamp. Should this happenduring the trouble code readingprocedures described later, repair theengine control system trouble codesfirst.


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1985 Accord SEi, Civic CRX Si1986 Civic CRX Si, Civic Si1987 Civic CRX Si, Civic Si

Preliminary ChecksHonda service manuals list severalchecks which should be made beforereading trouble codes. Problems in theareas listed below can cause thecomputer to set false or misleadingcodes. Ignoring these checks can makeyou miss the real cause of a code! Thiscan lead to the unnecessary replace-

ment of good parts. Service manualprocedures for troubleshooting a codeassume all preliminary checks are good.These checks vary with vehicle. Typicalchecks are listed below. Refer to servicemanual for your vehicle requirements. Visually inspect electrical wiring &

connectors. Visually inspect vacuum hoses &

connectors. Perform a compression test. Perform an exhaust system

backpressure test. Perform a fuel pressure test. Check curb idle speed. Check ignition timing.

1) Make sure the engine computerLED display is easily viewable.

2) Have your pencil and paper ready.

3) Turn theignitionswitch ON,but DO NOTSTART THEENGINE.

4) Get code numbers from the LEDdisplay.

8 4 2 1

= ON

= OFF

O F F

ON

Each LED has anumeric value. The left LED has a

value of 8. The next LED in line

has a value of 4. The next LED in line

has a value of 2.

The right LED has avalue of 1.Add values of thelighted LEDs to getthe Trouble Code.(Off LEDs have avalue of zero.)

Example of code zero: No LEDs are lit,indicating a codezero (0).

Example of code 2: LED 2 is lit,indicating a code 2.

Example of code 10: LEDs 8 and 2 are lit,

indicating a code 10.(8 + 2 = 10)

8 4 2 1

8 4 2 1

8 4 2 1


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O F F O N

Trouble codes from zero (no LEDs lit)through 15 (all LEDs lit) are used.

When more than one code is stored: Each trouble code is presented

once. There is a 2 second pause between

codes.

5) Write down all displayed TroubleCodes.

6) To view codes a second time, turnthe ignition key OFF and then backto the ON position.

7) This completes trouble coderetrieval on these vehicles. Turn theignition keyOFF. (Theenginecomputer isback tonormal

operation.)

What to do with the Trouble CodesLook up the code definitions listed inSection 9, Honda Code Meanings.At this point you can either:

Have your vehicle professionallyserviced. Trouble codes indicateproblems found by the computer.or,


after repairs are completed, asfollows.

Erasing Trouble Codes After Repair Verify that the

ignition key is inthe OFF position.

Remove the

negative (-) batterycable and wait 15seconds.

All the troublecodes are nowerased fromcomputer memory!

Reconnect batterycable. You mayhave to reset the vehicle clock, radiostations, and so on.


O F F O N

SECONDS

15


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Multiple Codes... Depending upon system, trouble

codes are repeated 2 or 3 times insuccession.

Example: Code 12 Sent as...

PAUSE PAUSE

PAUSE or

PAUSE PAUSE

PAUSE PAUSE

PAUSE

Several different codes can be storedif the computer sees more than oneproblem.

Some systems group codes based onoccurrence:

Example: Codes 13 and 21 occur at different times.(Codes have unrelated causes.)Sent as...

PAUSE PAUSE

PAUSE

PAUSE PAUSE PAUSE

PAUSE

Notice how each code is repeated beforethe next code is sent.

Example: Codes 13 and 21 occur at same time.(Same failure may have caused bothcodes.)Sent as...

PAUSE

PAUSE

PAUSE PAUSE

PAUSE PAUSE

PAUSE --Notice how the codes are grouped andthe code group is repeated.

NOTE: Some early fuel injected models(typically 1986 & 1987) may use shortflashes for displaying all codes. The

flashes are 1 second long with a 2second pause between codes. Bothsingle and 2 digit codes are sent as onelong series of flashes. For example, atrouble code 13 would be displayed as13 consecutive short flashes (instead of1 long and 3 short flashes).

5) Write down all displayed TroubleCodes.

6) To view codes a second time, turnthe ignition key OFF and then backto the ON position.

7) This completes trouble coderetrieval on these vehicles. Turn the

ignition keyOFF. (Theenginecomputer isback tonormaloperation.)

O F F O N


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36

O F F O N

SECONDS15

What to do with the Trouble CodesLook up the code definitions listed inSection 9, Honda Code Meanings.At this point you can either: Have your vehicle professionally

serviced. Trouble codes indicate

problems found by the computer.or,

Repair the vehicle yourself usingtrouble codes to help pinpoint theproblem. Refer to Section 3, UsingCodes. Be sure to erase any troublecodes from the computers memoryafter repairs are completed, asfollows.

Erasing Trouble Codes after Repair Verify that the

ignition key is inthe OFF position.

Remove the negative (-) battery cableor indicated fuse and wait 15 seconds.

1986 to 1987 ALL: Remove the negative (-) batterycable .

1988 to 1989 Accord LXi: Remove the CLOCK Fuse, # 11 .

1988 to 1990 Civic, & CRX: Remove the HAZARD Fuse, # 34 .

1988 to 1990 Prelude (CARB): Remove the EFI/ECU Fuse, # 38 .

1988 to 1991 Prelude (INJ): Remove the CLOCK Fuse, # 35 .

1990 Accord: Remove the BACKUP Fuse, # 24 . 1991 Civic, CRX:

Remove the ECU Fuse, # 34 . All the trouble codes are now erased

from computer memory! Replace fuse or reconnect battery

cable. You may have to reset thevehicle clock, radio stations, and soon.


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1991 Accord (all)1991 Prelude with 2.1L engine1992 All models

Preliminary ChecksHonda service manuals list severalchecks which should be made beforereading trouble codes. Problems in theareas listed below can cause thecomputer to set false or misleadingcodes. Ignoring these checks can makeyou miss the real cause of a code! Thiscan lead to the unnecessary replace-

ment of good parts. Service manualprocedures for troubleshooting a codeassume all preliminary checks are good.These checks vary with vehicle. Typicalchecks are listed below. Refer to servicemanual for your vehicle requirements. Visually inspect electrical wiring &

connectors. Visually inspect vacuum hoses &

connectors. Perform a compression test. Perform an exhaust system

backpressure test. Perform a fuel pressure test. Check curb idle speed. Check ignition timing.

1) Make sure theignition key isin the OFFposition.

2) Access the Service CheckConnector.This 2-contact rectangular connectoris usually light blue and is located asfollows:Accord, 1991-1992Above the Front Passengers KickPanel (right of passengers right foot)close to the door.Civic, 1992Behind the Front Passengers KickPanel (right of passengers right foot).

O F F O N

Prelude, 1991 (with 2.1L engine)Under the hood, on the left fender, tothe rear of the Fuse/Relay Block. Thisconnector will likely have a protectivecover over the terminals.Prelude, 1992Behind the center console, in front ofthe accelerator pedal.

Note: Search carefully for the ServiceCheck connector. It may be tucked awayamong vehicle harnessing

3) Install theWHITEjumper wirein theServiceCheck

Connector.

4) Have yourpencil and paper ready.

5) Turn theignition keyON, but DONOT STARTTHE ENGINE.

6) All except 1991 Prelude with 2.1Lengine: Get codes from the flashingCHECK engine light.1991 Prelude with 2.1L engine ONLY: Get codes from the flashing LED.(Engine computer must be accessed.)

The light blinks long flashes and shortflashes.

The duration of the LONGflash is 2 seconds.

The duration of the SHORT

flash is 1 second.

O F F

ON


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For codes 1 through 10... Count SHORT flashes to get the code.Example of code 4:

For codes 11 through 99... Count LONG flashes to get the first

digit. Count SHORT flashes to get the

second digit. Combine digits to get the code.Example of code 12:

PAUSE The pause between the first and seconddigits is 2 seconds.

Remember: If SHORT flashes come first, the code

is 10, or less.

If LONG flashes come first, it is thefirst digit of a two digit code.The pause between codes is 2 seconds.

Multiple Codes... Depending upon system, trouble

codes are repeated 2 or 3 times insuccession.

Example: Code 12 Sent as...

PAUSE PAUSE

PAUSE or

PAUSE PAUSE

PAUSE PAUSE

PAUSE

Several different codes can be stored

if the computer sees more than oneproblem.

Some systems group codes based onoccurrence:

Example: Codes 13 and 21 occur at

different times.(Codes have unrelated causes.)Sent as...

PAUSE PAUSE

PAUSE PAUSE

PAUSE PAUSE

PAUSE

Notice how each code is repeated beforethe next code is sent.

Example: Codes 13 and 21 occur at same time.(Same failure may have caused bothcodes.)Sent as...

PAUSE PAUSE

PAUSE PAUSE

PAUSE PAUSE

PAUSE --Notice how the codes are grouped andthe code group is repeated.


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Code MeaningsNote: Code meanings can vary with vehicle, model year, engine type and options. If a code number has more than one definition listed, note that only one definition

applies to your vehicle. Consult service manual to get the specific definition foryour vehicle.

Each code definition includes a list of possible causes for the code. Follow vehicle service manual procedures to find the cause of the code.

Remember:

1) Visual inspections are important!2) Problems with wiring and connectors are common, especially for intermittent faults.3) Mechanical problems (vacuum leaks, binding or sticking linkages, etc.) can make a

good sensor send an incorrect signal to the computer. This can cause a TroubleCode.

4) Incorrect information from a sensor may cause the computer to control the enginein the wrong way. Faulty engine operation might even make the computer show adifferent good sensor as being bad!

0 (zero)(Check Engine Light may beON or OFF.)Bad power or groundconnection to ElectronicControl Unit (ECU). FaultyECU Fuse. Short circuit incombination meter or CheckEngine light bulb wiring. BadECU. Problems withManifold Absolute Pressure(MAP) sensor, Throttle angle(Position) sensor,Atmospheric (PA) sensor,Idle Mixture Adjuster sensoror Exhaust GasRecirculation (EGR) valve liftsensor. Faulty AutomaticTransmission (A/T) controlunit or Main relay. No signalto ECU.

1Oxygen (O 2) sensor - BadOxygen sensor or faultysensor wiring.or ,Pressure regulator - BadPressure regulator, faultyassociated wiring orimproper fuel pressure.

or ,Spark Plug mis-fire

2Oxygen (O 2) sensor - BadOxygen sensor or faultysensor wiring.or ,Vehicle Speed Sensor(VSS) - Bad Vehicle Speedsensor, faulty sensor wiring,Vacuum leaks or improperFuel pressure.or ,Electronic Control Unit(ECU) - Bad ECU or faultyECU wiring.

3Manifold AbsolutePressure (MAP) sensor -Bad MAP sensor or faultysensor wiring.

4Top Dead Center/Crank/Cylinder (TDC/CRANK/CYL) sensors - Bad TDC/ CRANK/CYL sensor orfaulty sensor wiring.or ,TDC/Crank sensor - BadTDC/Crank sensor or faultysensor wiringor ,

Crank Angle sensor - BadCrank Angle sensor or faultysensor wiring.or ,Pulse Generator assembly- Bad Pulse Generatorassembly or faulty pulsegenerator wiring.or ,Vacuum Switch - BadVacuum switch or ManifoldAbsolute Pressure (MAP)sensor. Faulty switch/sensorwiring or Vacuum lines.or ,Electronic Control Unit(ECU) - Bad ECU or faultyECU wiring.

5Manifold AbsolutePressure (MAP) sensor -Bad MAP sensor orrestriction in throttle body.Faulty Vacuum hose orsensor wiring.

6Coolant Temperature (TW)senso r - Bad CoolantTemperature sensor. FaultyAutomatic Transmission (A/ T) control unit or sensor/ control unit wiring.


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7Throttle Angle (position)sensor - Bad Throttle Angle(position) sensor. FaultyAutomatic Transmission (A/ T) control unit or sensor/ control unit wiring.or ,Clutch Switch SignalManual Transmission (M/T) - Bad Clutch SwitchControl unit or faulty controlunit wiring.or ,Automatic Transmission(A/T) Shift Position Signal- Faulty control unit orcontrol unit wiring.

8Top Dead Center (TDC)senso r - Bad TDC sensor orfaulty sensor wiring.or ,Pulse generator - BadPulse generator or faultywiring.or ,Ignition Output Signal -Bad Ignition coil or faultyignition wiring.or ,CYL sensor - Bad CYLsensor or faulty sensorwiring.or ,TDC/Crank sensor - BadTDC/Crank sensor or faultysensor wiring.or ,Crank Angle sensor - BadCrank Angle sensor. Faultysensor wiring or CrankAngle sensor wiring nearSpark Plug wires.

9NO.1 Cylinder (CYL)sensor - Bad NO. 1 CYL

sensor or faulty sensorwiring.or ,CYL sensor - Bad CYLsensor assembly or faultysensor wiring.or ,TDC/Crank/CYL sensor -Bad TDC/Crank/CYL sensoror faulty sensor wiring.

or ,

CRK/CYL sensor - BadCRK/CYL sensor or faultysensor wiring.or ,Crank Angle sensor - BadCrank Angle sensor. Faultysensor wiring or Crank Anglesensor wiring near Spark

Plug wires.

10Air Temperature (TA)sensor - Bad AirTemperature sensor or faultysensor wiring.or ,Intake Air Temperature(TA) sensor - Bad Intake AirTemperature sensor or faultysensor wiring.

11Idle Mixture Adjuster (IMA)sensor - Bad IMA sensor orfaulty sensor wiring.

12Exhaust Gas Recirculation(EGR) system - Blocked

EGR passages. Bad EGRvalve, EGR Control Solenoidvalve, Constant VacuumControl (CVC) valve, (EGR)Solenoid Control valve, EGRControl solenoid, EGRControl Lift sensor, EGRsolenoid, EGR Valve Liftsensor or EGR Lift sensor.Improper Vacuum hoserouting. Faulty Vacuumhose(s). Wiring associatedwith these parts.

13Atmospheric Pressure(PA) sensor - Bad PAsensor or faulty sensorwiring.

14Electronic Air Control

valve (EACV) - Bad EACVor faulty EACV wiring.or ,Idle Control System(EACV) - Bad EACV or faultyEACV wiring.or ,Electronic Control Unit(ECU) - Bad ECU or faultyECU wiring.

15Ignition Output Signal -Bad Igniter unit, Ignition coilor faulty ignition wiring.NOTE: If engine will not start,

crank for 20 seconds toreproduce codes.

Igniter may be damageddue to short in wire toECU. If no code is stored,Check Engine Light maystay ON while serviceconnector is jumped.

or ,Electronic Control Unit(ECU) - Bad ECU or faultyECU wiring.

16Fuel Injector circuit - BadFuel Injector, Fuel Injectorresistor, Main Relay or faultyassociated wiring.

17Vehicle Speed Sensor(VSS) - Bad VSS or faultysensor wiring.or ,Vehicle Speed Pulsar(VSS) - Bad VSS. FaultyAutomatic Transmission (A/ T) control unit or sensor/ control unit wiring.

19Lock-up Control solenoid -Bad Lock-up solenoid, Lock-

up Solenoid Valve or faultysolenoid wiring.

20Electrical Load Detector(ELD) - Bad ELD or faultyELD wiring.or ,Electric Load detector(ELD) - Bad ELD or faultyELD wiring.

21Variable Valve TimingElectronic Control (VTEC)Spool Valve - Bad VTECSpool valve or faulty valvewiring.


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42 HONDA

22Variable Valve TimingElectronic Control (VTEC)Oil Pressure switch - BadVTEC Oil Pressure switch,VTEC Spool Valve or faultyswitch/valve wiring.

23Knock sensor - Bad Knocksensor or faulty sensorwiring.

30Automatic Transmission(A/T) A signal - Faultysignal wiring.or ,

A/T FI Signal A - Faultysignal wiring.

31Automatic Transmission(A/T) B signal - Faultysignal wiring.or ,A/T FI Signal B - Faultysignal wiring.

41Oxygen (O 2) sensor heater- Bad Oxygen sensor orfaulty sensor wiring.or ,Linear Air/Fuel Ratio (LAF)sensor - Bad LAF sensor orfaulty sensor wiring.

43Fuel Supply system - BadOxygen (O 2) sensor orproblem in fuel system.

48Linear Air/Fuel Ratio (LAF)sensor - Bad LAF sensor orfaulty sensor wiring.


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43NISSAN

Vehicle Preparation

Complete ALL steps in this section

before proceeding to ReadingTrouble Codes, page 46IMPORTANT: Reading trouble codes onNissan vehicles requires access to theengine computer. Due to varyingmounting locations and methods,some mechanical disassembly maybe required! Refer to the ComputerLocation table in step 3 (see page 44). If

you are unfamiliar or uncomfortable withthe disassembly required, you may wantto get help from another person beforeproceeding.

1) Safety First! Set the parking brake. Put the shift lever in PARK or Neutral.

Block the drive wheels. Make sure all accessories are turned

OFF. Make sure the

ignition key isin the OFFposition.

2) Test theCHECKEngine Light(Also calledCHECKENGINE , orlabeled with a small engine picture.)

NOTE: If vehicle does NOT have a CHECK engine light, go directly to step 3.

Turn the ignition key from the OFF tothe ON position, but do not start theengine!

Verify that the light turns ON. If the light does not turn on, you have

a problem with this circuit which mustbe repaired. Refer to the vehicleservice manual. Some publicationshave this information in books orsections called Computerized EngineControls, Electronic Engine Controlsor Tune-Up Information.

Turn the ignition key OFF .

O F F O N

CHECK


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44 NISSAN

3) Locate the Engine ComputerNote: Nissan refers to the engine computer as the ECU (Electronic Control Unit).

Vehicle Line Computer Location

Axxess 1990 Under Dashboard, behind Center Console

Maxima 1985 - 1986 Under Left Side of Dashboard

1987 - 1988 Under Front Passenger Seat

1989 - 1992 Under Dashboard, behind Center Console

NX 1991 - 1992 Under Dashboard, behind Center Console

Pathfinder ALL Under Front Passenger Seat

Pickup ALL Under Front Passenger Seat

Pulsar 1987 - 1989 Under Front Passenger Seat

1990 Between the Front Seats

Sentra 1987 - 1989 Under Front Passenger Seat

1991 - 1992 Under Dashboard, behind Center Console

2 WD 1990 Between the Front Seats

4 WD 1990 Under Drivers SeatStanza 1984 - 1986 Behind Drivers Kick Panel (left of drivers left foot)

1987 - 1989 Under Front Passenger Seat

1990 - 1991 Under Center Console

1992 Behind Center Console

Wagon 1987 - 1988 Under Drivers Seat

Van 1987 Under Front Passenger Seat

1988 Next to Rear Seat on Drivers side, behind the leftKick Panel (left of left rear passengers position)

1990 On left side behind the Panel above the VehiclesBattery

200SX ALL Behind Drivers Kick Panel (left of drivers left foot)

240SX 1989, 91 - 92 Behind Front Passengers Kick Panel (right ofpassengers right foot)

1990 Under Right Side of Dashboard

300ZX 1984 - 1989 Behind Front Passengers Kick Panel (right ofpassengers right foot)

1990 Center of Dashboard, Behind Console

1991 - 1992 Behind the Glove Box


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46 NISSAN

Reading CodesImportant: Complete ALL steps in Vehicle Preparation before readingtrouble codes.

Nissan uses several engine computersystems and trouble code readingprocedures. Trouble codes are obtained by

counting LED (Light Emitting Diode)flashes.

The LEDs are built into the computer there may be 1 or 2 LEDs used.

Refer to chart on next page for yourvehicle.

1) Find the number of LEDs used .

2) Read the procedure for countingflashes, page 48.

3) Follow the test procedure on thepage listed in the chart.

The procedures assume you already knowhow to get codes from the LED flashes.

Vehicle computer systems listed for reference referred to in service manuals.EFI ECS Electronic Fuel Injection Electronic Control System.ECCS Electronic Concentrated engine Control System.ECCS-5 Electronic Concentrated engine Control System with 5 test modes.ECCS-2 Electronic Concentrated engine Control System with 2 test modes.


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48 NISSAN

2 LED SystemHow to Count Flashes to get TroubleCodesThis system uses a RED and a GREENLED.

All Nissan trouble codes are 2 digitslong.

Count RED flashes to get the firstdigit.

Count GREEN flashes to get thesecond digit.

Combine digits to get the code.

Example of code 12: RED GREEN GREEN

PAUSE The RED LED will flash first, followed

by the GREEN LED.

Example of code sequence 12 and 32: RED GREEN GREEN

PAUSE PAUSE

RED RED RED GREEN GREEN

PAUSE

Note the 1 flash of the RED LED then 2flashes of the GREEN LED (indicating acode 12 ) followed by a pause followedby 3 flashes of the RED LED then 2flashes of the GREEN LED (indicating acode 32 ).

1 LED SystemHow to Count Flashes to get TroubleCodesThis system uses a single RED LED. The LED blinks long flashes and short

flashes. The duration of the LONG flash is .6

seconds. The duration of the SHORT flash is

.3 seconds. All Nissan trouble codes are 2 digits

long. Count LONG flashes to get the first

digit. Count SHORT flashes to get the

second digit. Combine digits to get the code.

Example of code 12:

PAUSE Look for the LONG flashes first, then

the SHORT flashes when reading acode.

Example of code sequence 12 and 32:

PAUSE LONG PAUSE

PAUSE

Note the 1 long flash of the LED then 2short flashes (indicating a code 12 )followed by a long pause followed by 3long flashes of the LED then 2 shortflashes (indicating a code 32 ).

The long pause between codes is 2.1seconds.


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49NISSAN


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50 NISSAN

1984 Stanza

Warning: Involves running engine.Observe all safety precautions (see

page 2). Work in well ventilated area.

1) Use Selector tool or other means toturn the Diagnosis Mode Selectorto the ON position.

2) Turn the ignitionswitch ON, but DONOT START THEENGINE.

3) Check to see thatboth the RED andGREEN LEDs turnON and flash atthe same time: If they do, proceed to the next step. If they do not, the computer (ECU)

may be defective. Refer to vehicleservicemanual.

4) Depress andreleaseacceleratorpedal.

5) Turn the A/C switchfrom OFF to ON toOFF (if equipped).


7) Observe the RED and GREENLEDs. Code 32 is normal at this point and

may be ignored.

Codes other than 32 indicate aproblem which should be repairedbefore proceeding.

DIAGNOSTIC IND.

PLEASE OPERATE

WITHIN THIS EXTENT

CAUTIONOFF

ON

O F F

ON

A/C

8) When the results from Step 7 aresatisfactory, start the engine andobserve the RED and GREENLEDs.

Vehicles with air conditioning: Code44 indicates that the computersystem is O.K. and that testing iscomplete. Codes other than 44indicate a problem which should berepaired.

Vehicles without air conditioning: Code 31 indicates that the computersystem is O.K. and that testing is

complete. Codes other than 31indicate a problem which should berepaired.

9) When all diagnostic procedures arecomplete, turn the ignition switchto the OFFposition, and theDiagnosis ModeSelector to theOFF position.

What to do with the Trouble CodesLook up the code definitions listed inSection 12, Nissan Code Meanings,At this point you can either: Have your vehicle professionally


Repair the vehicle yourself usingtrouble codes to help pinpoint theproblem. Refer to Section 3, UsingCodes. Be sure to erase any trouble

codes from the computers memoryafter repairs are completed, asindicated on the following page.

O F F O N


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52 NISSAN

1984 - 85 200SX, 1985 Stanza



1) Using the SelectorTool or othermeans, verify thatthe Diagnosis ModeSelector is in theOFF position.

2) Turn the ignitionswitch ON, but DONOT START THEENGINE.

3) Check to see that both the RED andGREEN LEDs turnON and stay ON. If they do, proceed

to the next step. If they do not, you

have a problem with the batterysupply circuit which feeds thecomputer (ECU), or the ECU itselfmay be defective. This failure mustbe repaired before proceeding. Referto the vehicle service manual. Somepublications have this information in

books or sections called Computer-ized Engine Controls, ElectronicEngine Controls, or Tune-UpInformation.

4) Turn the DiagnosisMode Selector tothe ON position.


6) Observe the RED and GREENLEDs. Codes 23, 24, and 31 should be

displayed. Note any codes other than 23, 24,

and 31 .

O F F

ON

7) Depress andrelease accelera-tor pedal.

8) Observe theRED and GREENLEDs. Codes 24, and 31 should be

displayed. Note any codes other than 24, and

31 .

9) Move thegear shiftlever fromNeutral to the highest gear andthen back to Neutral.

10)Observe the RED and GREENLEDs.

Code 31 should be displayed. Note any codes other than 31 .

11)Start the vehicles engine.

12)Observe the RED and GREENLEDs.

Code 31 should be displayed. Note any codes other than 31 .

13)Turn the A/C switchfrom OFF to ON toOFF (if equipped).

14)Observe the RED

and GREEN LEDs. Code 44 should be displayed. Note any codes other than 44 .

15)When all diagnosticprocedures arecomplete, turn theDiagnosis Mode

Selector to the OFFposition, and the ignition switch tothe OFF position.

P R N D 2 1

A/C


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53NISSAN

What to do with the Trouble Codes

Look up the code definitions listed inSection 12, Nissan Code Meanings,At this point you can either: Have your vehicle professionally



after repairs are completed, asfollows:

Erasing Trouble Codes after Repair

16)Verify that the Diagnosis ModeSelector is in the OFF position.

17)Remove eitherthe harnessconnectorfrom thecomputer(ECU), or thenegative (-)battery cableand wait 15seconds.

Trouble codes are now erased!

18)Reconnect the ECUs harnessconnector, or the negative (-)battery cable. You may have toreset the vehicle clock, radiostations, and so on.

Important: The computer has alearning ability to take care of minorvariations in engine control operation.Whenever you erase the computermemory, the computer has to relearnvarious things. Vehicle performance maybe noticeably different until it relearns.This temporary situation is normal. The

learning process takes place duringwarm engine driving.NOTE: When reinstalling the ECU, becareful to route all wiring to its originalposition.

SECONDS

15


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54 NISSAN

1986 Stanza, 200SX



1) Using the SelectorTool or othermeans, verify thatthe Diagnosis ModeSelector is in theOFF position.

2) Turn the

ignitionswitch ON, butdo not startthe engine.

3) Check to see thatboth the RED andGREEN LEDs turnON and stay ON. If they do, proceed to the next step. If they do not, you have a problem

with the battery supply circuit whichfeeds the computer (ECU), or theECU itself may be defective. Thisfailure must be repaired beforeproceeding. Refer to the vehicleservice manual. Some publicationshave this information in books orsections called ComputerizedEngine Controls, Electronic EngineControls, or Tune-Up Information.

4) Turn the DiagnosisMode Selector tothe ON position.


6) Observe the RED and GREENLEDs. Manual Transmission vehicles:

codes 23, 24, 31, and 32 should bedisplayed.

Note any codes other than 23, 24,31, and 32 .

O F F

ON

Automatic Transmission vehicles: codes 31, and 32 should bedisplayed.

Note any codes other than 31, and32 .

7) Depress andreleaseacceleratorpedal.

8) Observe the RED and GREEN

LEDs. Codes 24, 31, and 32 should be

displayed. Note any codes other than 24, 31,

and 32 .

9) Move thegear shift

lever fromNeutral to the highest gear andthen back to Neutral.

10)Observe the RED and GREENLEDs. Codes 31, and 32 should be

displayed.

Note any codes other than 31, and32 .

11)Start the vehicles engine.

12)Observe the RED and GREENLEDs. Code 31 should be displayed.

Note any codes other than 31 .

13)Turn the A/C switchfrom OFF to ON toOFF (if equipped).

14)Observe the REDand GREEN LEDs. Code 44 should be displayed. Note any codes other than 44 .

A/C

P R N D 2 1


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55NISSAN

15)When all diagnosticprocedures arecomplete, turn theDiagnosis ModeSelector to the OFFposition, and theignition switch to the OFF position.

What to do with the Trouble CodesLook up the code definitions listed inSection 12, Nissan Code Meanings,At this point you can either: Have your vehicle professionally

serviced. Trouble codes indicateproblems found by the computer.or, Repair the vehicle yourself using

trouble codes to help pinpoint theproblem. Refer to Section 3, UsingCodes. Be sure to erase any troublecodes from the computers memoryafter repairs are completed, as

follows:

Erasing Trouble Codes after Repair

16)Verify that the Diagnosis ModeSelector is in the OFF position.

17)Removeeither theharnessconnectorfrom thecomputer(ECU), or thenegative (-)battery cableand wait 15

seconds.Trouble codes are now erased!

18)Reconnect the ECUs harnessconnector, or the negative (-)battery cable. You may have toreset the vehicle clock, radiostations, and so on.

Important: The computer has alearning ability to take care of minorvariations in engine control operation.Whenever you erase the computermemory, the computer has to relearnvarious things. Vehicle performance maybe noticeably different until it relearns.

This temporary situation is normal. Thelearning process takes place duringwarm engine driving.

NOTE: When reinstalling the ECU, becareful to route all wiring to its originalposition.

SECONDS

15


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56 NISSAN

1984 200SX Turbo, 300ZX, 300ZX Turbo



1) Mark the initial setting of theDiagnostic Mode Selectoron the computerhousing.

IMPORTANT: The Diagnostic Mode Selector is a potentiometer. It is critical that the initial position (setting)of this potentiometer be marked on the computer housing so that when testing is complete, it can be reset to its original position!

2) Using the SelectorTool or other means,

turn the DiagnosisMode Selector to thefully COUNTER-CLOCKWISE position.

3) Turn theignitionswitch ON,but do not

start theengine.

4) Check to see thatboth the RED andGREEN LEDs turnON and stay ON.

toyotahondanissan code scanner cp9025_english

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