E20CC

'Rough road detection' signal (by comparing wheel speeds)


Possible cause:

- Control unit ABR
Affected functions:

- Engine running

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Test 1: Test wheel speed signals.

1. Test wheel speed signals.
The actual values are supplied through CAN bus from component N47-5 (ESP control unit).Test prerequisites

- CAN communication to control module N47-5 (ESP control unit) is o.k.
- Current fault code '20CC' present.
Status of relevant fault code:Test sequence

- Switch on ignition.
- Rotate relevant wheel.( >60 1/min)
Status of the relevant actual values:
- Vehicle speed left front axle:Warning! Communication with ECU required.
- Vehicle speed left rear axle:Warning! Communication with ECU required.
Specified values

- Vehicle speed>3 km/h
Question

- Are the actual values o.k.?


YES
The actual values are okay.End of test

NO
The actual values are not okay.Possible cause and remedy

- Read fault memory from control unit ABR and rectify faults.
End of test