Checking activation

Connect voltage tester V.A.G 1527 B with measuring probes and connector adapters from V.A.G 1594 A between socket 2 (CMP sensor signal) and socket 1 (B+); the harness connector remains connected.

Fig 1: Connecting Voltage Tester V.A.G 1527 B Between Socket 2 (CMP Sensor Signal) And Socket 1 (B+)

Courtesy of AUDI OF AMERICA, INC.

NOTE: Connector socket numbers are shown on the rear side of the connector.

Operate starter for a few seconds.
- LED must blink.

NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.

Switch ignition off.

If LED does not blink: