2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 994

- Engine diagnosis

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Test 1: Test control unit.

1. Test control unit.

Test control unit.

Possible cause and remedy

- Erase fault memory and start engine.

- Reread fault memory of control unit N3/10 (ME-SFI [ME] control unit).If fault reoccurs, replace component N3/10 (ME-SFI [ME] control

unit).

Read coding and transfer to the new control unit.End of test

1389

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.

1390

Air injection diagnosis

Possible cause:

- Secondary air injection

Affected functions:

- Engine output

-------------------------------------------------

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.