B1412 (M2.10.2 only)
Symptom: No idling speed increase takes place when the radiator fan is running. Engine rpm may drop with engine failure as a result.
| B1412 (M2.10.2 only) |
Idling speed increase shorted to battery positive
Fault symptom
No idling speed increase takes place when the radiator fan is running. Engine rpm may drop with engine failure as a result.
Diagnostic procedure
| 1. |
Plug in a BOB and
connect a voltmeter to it. Select "ACT. OTHER FUNCT" on the scan tool and then "IDLING
INCREASE". Check that a reading of 0 V is obtained when "ON" and 12 V when "OFF".
|
|
| 2. |
If these readings are not obtained, check the lead between pin 10 of the ICE
module connector and pin 44 of the M2.10.2 engine management system's control
module connector for shorting to battery positive.
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|
| 3. |
Plug in the ICE control module and ground pin 44 of the engine management
system's control module connector. Take a voltmeter reading and repeat point 1.
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|
| 4. |
If the voltmeter reading is 0 V, consult Service Manual 2:7 for engine
management system fault diagnosis. If the voltmeter reading is not 0 V, proceed to
.
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