Power supply

Connect the voltmeter to terminal 2 and ground of the disconnected plug of the idle speed control using test leads. Switch ignition on.

Display: Battery voltage If no display:

Check power supply in accordance with wiring diagram. Control signal test

Using the system tester 9288, it is possible to read the pulse duty factor in percent directly in the „Actual value" menu. Function test: Switch on loads during idle operation. The pulse duty factor must change, while the idling speed remains constant. If not:

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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