2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 995

1392

Air injection diagnosis

Possible cause:

- Secondary air injection

Affected functions:

- Engine output

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Test 1: Test secondary air injection (function chain).

1. Test secondary air injection (function chain).

Test sequence

- Switch on ignition.

- Test secondary air injection (function chain).(Move on to actuation with button F2)

Warning!Communication with ECU required.

1425

Wheel speed signal is implausible.

Possible cause:

- The signal transmitted by the CAN databus for the wheel speeds is implausible.

Affected functions:

- Electronic stability program ESP

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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, SPS [PML] and BAS control unit).Test prerequisites

- CAN communication to control module N47-5 (ESP, SPS [PML] and BAS control unit) is o.k.

Test sequence

- Switch on ignition.

- Rotate relevant wheel.(n >60 1/min)

Status of the relevant actual values:

- Vehicle speed at rear axle:Warning! Communication with ECU required.

- Vehicle speed at front 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