- 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.?
