2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 824

Test sequence

- Switch off ignition.

- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).

- Measure direct current with multimeter between sockets [F.4] 100 and [F.19] 115 of the 126-pole socket box tester.

- Switch on ignition.

Warning!Perform the measurement only for a short time so that component M33 (electric air pump) does not overheat.Specified value

- Amperage[0.1...0.3] A

- Component M33 (electric air pump) is switched on and is heard to run.

Question

- Is the measurement value OK?

YES

The test was okay.End of test

NO

The measurement value is not OK.Possible cause and remedy

- N10/1f61 (Fuse 61)

- Lines to component N10/1kR (Air pump or oil cooler fan relay)

- N10/1kR (Air pump or oil cooler fan relay)

End of test

1069

Y32 (Air pump switchover valve) : Short circuit to positive (P0413)

Possible cause:

- Y32 (Air pump switchover valve)

Affected functions:

- Engine diagnosis

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Test 1: Check component Y32 (Air pump switchover valve).