TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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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.
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 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