P0112
Intake air temperature sensor 1 has a short circuit to ground. The limit value for electrical voltage has not been attained.
Possible cause:
- B2/5b1 (Intake air temperature sensor)
Affected functions:
- Engine diagnosis
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Test 1: Check component B2/5b1 (Intake air 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 177.
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 sequence
- Switch on ignition.
Status of relevant actual value:
- Intake air temperature:Warning! Communication with ECU required.
Specified value
- Current temperature in area surrounding component B2/5b1 (Intake air temperature sensor)
Question
- Is the actual value o.k.?
YES
The actual value is okay.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 177.
Image legends
- B2/5 (Hot film mass air flow sensor)
- Connector (5-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° 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° C ] for a short period of time and drops back down to the substitute value of approx. [ 40° C ].
Question
- Is the actual value o.k.?
YES
The actual value is okay.Further possible causes of fault
- Check internal resistance of component B2/5b1 (Intake air temperature sensor).
NO
The actual value is not o.k.Possible cause and remedy
- Signal wire
End of test
1.3. Check internal resistance of component B2/5b1 (Intake air temperature sensor).
Test sequence
- Switch off ignition.
- Detach coupling at component B2/5 (Hot film mass air flow sensor).
- Measure resistance with multimeter between pins (B2/5) 2 and (B2/5) 3
Specified value
- Resistor(20° C): [2350...2500]ohms
- Resistor(30° C): [1600...1700]ohms
- Resistor(40° C): [1100...1200]ohms
- Resistor(50° C): [800...900]ohms
Question
- Are the measurement values OK?
YES
The measurement values are OK.End of test
NO
The measurement values are not OK.Possible cause and remedy
- B2/5b1 (Intake air temperature sensor)
End of test