2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 811

1.1.5. Check exhaust system for leaks.

Possible cause of fault

- Leaks

Possible remedy

- Check entire exhaust system for leaks.

1.1.6. Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.

Test 1.1.6.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.

Test 1.1.6.2: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.

Test 1.1.6.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).

1.1.6.1. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.

Warning!Communication with ECU required.

1.1.6.2. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.

Warning!Communication with ECU required.

1.1.6.3. Check reference signal of component B2/5 (Hot film mass air flow sensor).

Test sequence

- Switch on ignition.

Status of relevant actual value:

- HFM-SFI ( Reference signal ):Warning! Communication with ECU required.

Specified value

- Reference signal[46...59] ms

Question

- Is the measurement value OK?

YES

The actual value is okay.End of test

NO

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

- Check lines from component N3/10 (ME-SFI [ME] control unit) to component B2/5 (Hot film mass air flow sensor).

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

1053

This fault can be ignored and erased.

Possible cause:

- This fault can be ignored and erased.

Affected functions:

- Engine diagnosis

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Test 1: This fault can be ignored and erased.

1. This fault can be ignored and erased.

Note:This fault can be ignored and erased.