2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 970

- Signal wire

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

End of test

NO

The measurement value is not OK.Possible cause and remedy

- N10/1f43 (Fuse 43)

- Cable for voltage supply

End of test

1347

B2/5 (Hot film mass air flow sensor) : Open circuit / Short circuit to ground or to positive (P0102)

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

Test 2: Possible cause:

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

Affected functions:

- Engine diagnosis

- Engine output

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).