Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
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Connect multimeter to measure voltage using auxiliary cables front V.A.G 1594 to connector contacts 1 + 3.
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Switch ignition on.
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Specification: min. 4.5 V
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Switch ignition off.
If the specification is not obtained:
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Connect test box V.A.G 1598/31 to control unit wiring harness (The engine control module remains disconnected).
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Check wiring between test box and connector for open circuit according to wiring diagram.
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Contact 1 + socket 108
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Contact 2 + socket 98
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Contact 3 + socket 101
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Wire resistance: Max. 1.5 ohms
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Additionally check wires for short to one another.
If no faulty wiring is detected and voltage was present between contains 1 + 3:
See Checking function, below.
If no faulty wiring is detected and no voltage was present between contacts 1 + 3:
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Replace engine control module.
Checking function