2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1019

YES

The measurement values are OK.End of test

NO

The measurement values are not OK.Possible cause and remedy

- Lines to component B28 (Pressure sensor)

- B28 (Pressure sensor)

Further possible causes of fault

- Vacuum line

End of test

1858

Ratio of HFM signal to intake manifold pressure is too low.

Possible cause:

- B28 (Pressure sensor)

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

Affected functions:

- Engine output

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

Test 2: Check component B28 (Pressure sensor).

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.