2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 655

Test prerequisite

- The actuation was not okay.

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 [M.53] 53 of the 126-pole socket box tester.

- Switch on ignition.

Specified value

- Amperage[0.3...0.6] A

Question

- Is the measurement value OK?

YES

The measurement value is OK.End of test

NO

The measurement value is not OK.Possible cause and remedy

- N10/1f57 (Fuse 57)

- N10/1kI (Circuit 87 relay, engine)

- Line between component N3/10 (ME-SFI [ME] control unit) and component Y32 (Air pump switchover valve)

- Line between component N10/1 (Driver-side SAM control unit with fuse and relay module) and component Y32 (Air pump switchover valve)

- Y32 (Air pump switchover valve)

End of test

0817

The secondary air valve (cylinder bank 1) is jammed open. (P2440)

Possible cause:

- Y32 (Air pump switchover valve)