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B1412

B1412

Idle speed increase short-circuited to Batt+



Fault symptom

Idling speed does not increase when the radiator fan starts. The engine speed could drop causing it to stall.

Measures


1. Connect a BOB and a voltmeter. Select "ACT.OTHER FUNCT" on the diagnostics instrument and then "IDLING INCREASE".

Check that the voltage is 0 V at "ON" and 12 V at "OFF".

2. If that is not the case, check the cable between ICE connection 10 and MOTRONIC engine control module's pin 44 for any short circuit to positive voltage.

3. Connect the ICE control module and ground pin 44 on the MOTRONIC engine control module.

Measure with a voltmeter and repeat point 1.

4. If the voltmeter shows 0 V, go to Service Manual 2.7 for fault-tracing in the engine control system.

If the voltmeter shows a voltage which is not 0 V, continue with the fault-tracing in Service Manual 3.5 under section ICE.