- Engine output
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Test 1: Check component B2/5b1 (Intake air temperature sensor).
Test 2: Check component B14 (Ambient temperature display temperature sensor).
1. Check component B2/5b1 (Intake air temperature sensor).
Test 1.1: Check component B2/5b1 (Intake air temperature sensor) using actual value.
Test 1.2: Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module ME 9.7.
Test 1.3: Check internal resistance of component B2/5b1 (Intake air temperature sensor).
1.1. Check component B2/5b1 (Intake air temperature sensor) using actual value.
Test prerequisites
- Switch off ignition.
- Leave vehicle with engine hood open for > 12 h.
Note
- The test prerequisites must be fulfilled for the test result to be meaningful.
Test sequence
- Switch on ignition.
Status of relevant actual value:
- Intake air temperature:Warning! Communication with ECU required.
- 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).
