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Flexible Service System Plus

(FSS PLUS)

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These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice.

Always check for revised or updated information.

To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer

to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair.Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US

version vehicles. Refer to the official introduction manual and WIS when available.

Copyright Mercedes-Benz USA, LLC, 2001

Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted

without written authorization from Mercedes-Benz USA, LLC or its successors.

Published by Mercedes-Benz USA, LLC

Printed in U. S.A.

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Objectives

Upon completion of this section, you will be able to:

Explain the differences between FSS and FSS PLUS

Identify new system components

Explain the brake wear calculation

Identify two methods for retrieving maintenance information

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Purpose of FSS (1st Generation)

Reduce operating andmaintenance costs

Less frequent services with

no loss of performance ordependability

Uses distance and time related

variables to determinemaintenance intervals

(A & B services)

Automatic notification of needfor service

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FSS PLUS Overview

In addition to the existing FSS, FSS PLUS incorporates:

Brake service intervals (+ indicator) An enhanced history memory

Service codes A thru H

A new control unit (Central Gateway)

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FSS PLUS Component OverviewData communicated on: CAN B, CAN C, CAN D & CAN SBC

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FSS PLUS Component Overview

(Engine Related Data)

The following inputs are sentto the engine control module

(N3/10)

Crankshaft position (L5) Oil level, quality and

temperature (B40)

Coolant temperature (B11/4)

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(Wheel Speed Related Data)

The following inputs aresent to the ESP control

module (N47/5)

L.F. wheel speed (L6/1)

R.F. wheel speed (L6/2)

L.R. wheel speed (L6/3) R.R. wheel speed (L6/4)

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(Brake Related Data)

A 50% sensor (S10/1) ishard wired to the left front

SAM (N10/1)

This sensor is used tocalculate remaining brake

pad life

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Brake Wear Calculation

Remaining brake pad life is calculated using:

Mileage since front brake pads replaced

50% front left brake pad wear sensor input

At 100% pad wear a warning is displayed.

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Brake Pad Wear Sensors

Sensors designed differentlyto avoid improper installation

One sensor on each front wheel

- left = 50 % (S10/1)- right = 100 % (S10/2)

One sensor right rear wheel

- 100 % (S10/4)

All sensors hard wired to N10/1

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(Information Transfer)

The central gateway (N93)receives information from

the following

Engine control module (N3/10)

ESP control module (N47/5)

Left front SAM (N10/1)

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Central Gateway (CGW)

Uses the following to calculateservice items and intervals

Engine oil variables

Brake wear calculation

Service items (service sheet)

History memory

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(Service Codes Accessed)

Service codes can beviewed in the instrument

cluster and via SDS

In the future, SDS/WIScan be used to generate

and print a service

sheet for the vehicle

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FSS PLUS Displays (Customer)

Customer display

Codes A-H are displayed

Accessed using the

multi-function steeringwheel (as before)

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Interpreting Service Codes

Servicecode

1hour

7h

ours

6

hours

2hours

3h

ours

4ho

urs

5hours

8hours

A

B

C

D

EF

G

H

Determined by the maintenancecalculation

Each service code has a

corresponding estimated time

+ next to a service code

indicates need for brake

service (inspection)- i.e. D+

Note: Service codes are used for estimating time ONLY. They do NOT indicate the same

service items for each code. Service items are determined by time and driving conditions.

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Accessing Workshop Information

Multi-Function Displays

1. Begin at the customerdisplay screen

2. Press and hold the

reset button for 5 seconds

3. Use the multi-function steeringwheel for scrolling

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Service Menu Screen

Initial screen that appearswhen accessing FSS PLUS

Scroll up and down using

the and buttons Select menu using button

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Service Data Screen

58M21 used in the futurefor generating a service

sheet via SDS/WIS

Weighting time it willtake to perform the service

items

- displayed in minutes

Miles/days remaining

- same as before

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Items Screen

Required service items

Refer to service sheet

for detailed break-down

or indicator in thedisplay indicates additional

items

- use / buttonsfor scrolling

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Confirmation Screen

Confirms service performed

in central gateway (N93)

All service items listed can

be confirmed and cancelled Individual service items can

be cancelled

Scroll up and down using

the and buttons

Select option using button

Key must be in position 2 in order to confirm service

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Special Work Screen

Allows you to manually set

a date for:

- exhaust gas analysis

- general inspection

Scroll up and down usingthe and buttons

Change month and year using

the and buttons

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Service Tip

(Brake Pad Wear Gauge)

Used for measuring

pad thickness (E320 only)

Also a tire tread depth

gauge 211 589 06 23 00

Rear caliper (right) Front caliper (right)

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Using the Tool

Move the slide (2) against

the driver (3)

Insert the gauge pin (4) in

the inspection hole

Move the gauge against

pad carrier

Read the pad thickness

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Service Notes

For CGW (N93) replacement store information in

SDS/DAS then download into new CGW

If CGW is damaged, information can be uploaded into

new CGW manually

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