GTI L4-1.8L Turbo (AWP) (2003)
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Pull the 3 pin connector off the diagnosis pump (V144).
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Connect the VAG 1527 B voltage tester between connector contact 3 (positive) and engine Ground.
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Start engine and run at idling speed: The LED must light up.
If the LED does not light up:
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Switch off ignition.
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Check the wire between connector contact 3 and central electrics for open circuit using wiring diagram: Wire resistance: max. 1.5 Ohms
LED lights up (voltage supply OK.):
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Connect test box V.A.G 1598/31 to control module wiring harness. The engine control module remains disconnected.
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Check wiring between test box and 3 pin connector for open circuit using wiring diagram. Contact 1 + socket 80 Contact 2 + socket 25 Wire