2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 859

- 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).

- Switch on ignition.

Status of relevant actual value:

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

Specified value

- If the connector is unplugged at component B2/5b1 (Intake air temperature sensor), value [ -40锟斤拷 C ] is displayed.

- Bridge pin 2 in pin 3 at the unplugged connection of component B2/5b1 (Intake air temperature sensor).The value is approx. [ 150锟斤拷 C ] for a

short period of time and drops back down to the substitute value of approx. [ -40锟斤拷 C ].

Question

- Is the actual value o.k.?