Checking activation

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

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

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: