- This fault can be ignored and erased.
Affected functions:
- Engine output
1. This fault can be ignored and erased.
Note:This fault can be ignored and erased.
2. No further information available.
2234
The coolant temperature is implausible relative to the intake air temperature.
Possible cause:
- B2/5 (Hot film mass air flow sensor)
- B11/4 (Coolant temperature sensor)
Affected functions:
- Engine diagnosis
-------------------------------------------------
Test 1: Check component B2/5b1 (Intake air temperature sensor).
Test 2: Check component B11/4 (Coolant 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.
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