[4matic] Tabelka objawy - przyczna - test.pdf

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Diagnosis - Troubleshooting chart

1

Complaint

Possible cause

Remedy/Test step

Read out fault memory

)

ASD/4MATIC function indicator lamp (A1e25) comes on

Steering angle sensor (N49): Cable transposed; plug

12

sometimes when driving without skid

connection makes poor contact

23 10.0, 11.0, 12.0

Read out fault memory

ASD/4MATIC function indicator lamp (A1e25) comes on

Speed sensors (L6, L6/1, L6/2)

12

when driving round a tight bend without skid

23

13.0, 14.0, 15.0

23

ASD/4MATIC warning lamp (A1e24) comes on or flashes

Service valve (up to 05/91)

2

33,

34

after starting engine, fault memory cannot be read out

)

4-MATIC valve control unit (A7/2)

Oil pressure switch (A7/2s1)

Pressure oil pump

ABS warning lamp (A1e17) comes on approx. 20 s after

4MATIC - ABS signal cable open-circuit

23

7.0

starting engine (fault memory cannot be read out)

Severe roughness when driving round a tight bend (4MATIC

Service valve (up to 05/91)

33,

34

shift stage 1)

4MATIC valve control unit (A7/2)

43

Solenoid valves

33,

34

Severe roughness when driving round a tight bend (4MATIC

Service valve (up to 05/91)

shift stage 0)

4MATIC valve control unit (A7/2)

43

Solenoid valves

Constant higher oil consumption without external leaks

Seals on pistons of multiple-disc clutches defective

32

Booming, droning, vibrating when cornering (Service valve in

Rear engine mount has settled

Adjust or replace rear engine mount

test position)

1 )

Note conditions for test

2 )

To diagnose a potential hydraulic fault more rapidly, the plug connection (x1) at the valve control unit (A7/2, location under right rear seat bench) must be disconnected.

Remove pin 7 or 8 and connect plug coupling. If the fault memory can now be read out, there is a hydraulic fault.

© Daimler AG, 14.07.12, G/03/09 / dh0801pf20013x / 8.1 - 4MATIC 13 - Diagnosis - Troubleshooting chart Model 124.2/3

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