audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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Connect VAG1527B voltage tester between sockets 2 (CMP sensor signal) and 1(B+).

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

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Operate starter for a few seconds.
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LED must blink briefly at every second engine rotation.

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.

If LED does not blink:

Checking voltage supply

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Disconnect connector at respective Camshaft Position (CMP) sensor.

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Switch ignition on.

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Connect multimeter for voltage measurement as follows:

Harness connector Terminal

Measure to

1

Engine Ground (GND)

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Specification: about 5 V

Checking signal wire

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