audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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

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

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Operate starter for a few seconds.
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LED must blink.

NOTE:  Voltage testers do not go out completely during low current pick-up between activations by 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 Camshaft Position (CMP) sensor.

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Connect multimeter for voltage measurement as follows:

Harness connector

Measure to

Terminal

1

Engine Ground (GND)

 

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Switch ignition on.
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Specification: about 5 V

Checking signal wire

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Connect multimeter for voltage measurement as follows:

Harness connector

Measure to

Terminal

2

Engine Ground (GND)

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Switch ignition on.
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Specification: approx. battery voltage

Checking Ground (GND) wire

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