Fault Fault Code Possible Causes Elimination Remarks

Connect a 2-pin DME test lead (Bosch No. 1 684 463 093) between the speed control and plug.

Connect and adjust engine tester in accordance with manufacturer's instructions.

Ensure that the lead connections do not have any ground contact with the vehicle. (Danger of short-circuit)

The following display must be visible when the engine is running:

Frequency approx. 100 Hz.

If no audible pulse exists in spite of the voltage and signal being present, replace the idle speed control.

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