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Checking activation

If installed, slide back rubber grommet from connector for Camshaft Position (CMP) sensor.
Connect voltage tester e.g. 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.
NOTE: Connector sockets are numbered respectively on the rear side of the connector.

Fig 1: Connecting Voltage Tester V.A.G 1527 B With Measuring Probes To CMP Sensor

G03451403

Courtesy of AUDI OF AMERICA, INC.

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: