Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
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Engine code ATW
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Fuse 34 must be OK
Checking sequence
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Disconnect 3-pin connector from Leak Detection Pump (LDP) -V144-.
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Connect voltage tester VAG 1527B between connector contact 3 (positive) and engine Ground.
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Start engine and run at idling speed: LED must light up.
If the LED does not light up:
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Check wire between connector contact 3 and central electric for open circuit using wiring diagram, repair as necessary.