Jetta L4-1.8L Turbo (AWD) (2000)
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.
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Check wiring between test box and 4-pin connector to Motronic control module for open circuit using wiring diagram.
Contact 3 and socket 68
Contact 4 and socket 69
Wire resistance: max. 1.5 ohms
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Additionally check wiring at 4-pin connector for short to one another.
Contact 4 and socket 68
Specification: Infinity ohms
If no wiring fault is detected:
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Replace engine electronics control module.