2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 854

- Engine output

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Test 1: Check component B2/5b1 (Intake air temperature sensor).

Test 2: Check component B14 (Ambient temperature display temperature sensor).

1. Check component B2/5b1 (Intake air temperature sensor).

Test 1.1: Check component B2/5b1 (Intake air temperature sensor) using actual value.

Test 1.2: Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module ME 9.7.

Test 1.3: Check internal resistance of component B2/5b1 (Intake air temperature sensor).

1.1. Check component B2/5b1 (Intake air temperature sensor) using actual value.

Test prerequisites

- Switch off ignition.

- Leave vehicle with engine hood open for > 12 h.

Note

- The test prerequisites must be fulfilled for the test result to be meaningful.

Test sequence

- Switch on ignition.

Status of relevant actual value:

- Intake air temperature:Warning! Communication with ECU required.

- Ambient temperature:Warning! Communication with ECU required.

Specified value

- The intake air temperature may be max. 5锟斤拷 C below the ambient temperature or 15锟斤拷 C above the ambient temperature.

Question

- Is the actual value for intake air temperature OK?

YES

The actual value is okay.Further procedure

- If only fault codes 1599 and 1600 occur in control unit ME-SFI, erase the fault memory.

- The component may not be replaced.

End of test

NO

The actual value is not o.k.Possible cause and remedy

- Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module N3/10 (ME-SFI [ME] control unit).

- Check internal resistance of component B2/5b1 (Intake air temperature sensor).

1.2. Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module ME 9.7.

Image legends

- Picture1

- B2/5 (Hot film mass air flow sensor)

- Connector (5-pin)

- Picture2

- B2/5 (Hot film mass air flow sensor)

- Connector (4-pin)

Test prerequisite

- The actual value is not o.k.

Test sequence

- Detach coupling at component B2/5 (Hot film mass air flow sensor).