Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Check wiring between test box and 10-pin connector for open circuit according to wiring diagram.
Terminal 9 + socket 79
Terminal 10 + socket 2
Terminal 10 + socket 28
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Wire resistance: max. 1.5 ohms
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Check wires for short to one another, to vehicle earth and to battery positive.
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Specification: Infinity ohms
If wiring and the resistance measurement values are OK:
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Replace engine control module. See: Computers and Control Systems/Engine Control Module/Service and Repair