Jetta L4-2.0L (AEG) (2000)
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Connect VAG1598/22 test box to control module wiring harness connector.
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Check wiring between test box and 4-pin harness connector for open circuit according to wiring diagram.
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Terminal 1 + socket 71
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Terminal 3 + socket 78
Wire resistance: max. 1.5 ohms
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Also, check if wires are shorted together.
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Terminal -3- + socket 71
Specified value: Infinity ohms
If no malfunction is found in the wiring and voltage was present between terminals -2- + -4-:
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Replace Engine Control Module (ECM).
Checking secondary winding