Golf GL L4-2.0L (AZG) (2001)
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Check wiring between test box and 6-pin connector for open circuit using wiring diagram.
Cylinder 1 contact 2 + socket 102
Cylinder 2 contact 3 + socket 95
Cylinder 3 contact 4 + socket 103
Cylinder 4 contact 5 + socket 94
Wire resistance: Max. 1.5 Ohms
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Also check wires for short to one another and to positive and Ground.
Specification: Infinity Ohms
If wiring is OK and voltage was present between contacts 1 + 6:
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Replace engine control module.