2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1411

Possible cause:

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

- M16/6 (Throttle valve actuator)

- Selfadaptation of mixture formation

Affected functions:

- Engine output

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Test 1: Check component B2/5 (Hot film mass air flow sensor).

Test 2: Check self-adaptation of mixture formation.

Test 3: Check component B2/5b1 (Intake air temperature sensor).

Test 4: Check component M16/6 (Throttle valve actuator).

1. Check component B2/5 (Hot film mass air flow sensor).

Test 1.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.

Test 1.2: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.

Test 1.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).

Test 1.4: Check power supply of component B2/5 (Hot film mass air flow sensor).

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

Warning!Communication with ECU required.

1.2. 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.

1.3. 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)

1.4. Check power supply of component B2/5 (Hot film mass air flow sensor).

Image legends

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