Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Check wiring between test box and 3 pin connector for open circuit according to wiring diagram.
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Wire resistance: max. 1.5 ohms
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Check wires at 3 pin connector for short circuit to one another according to wiring diagram.
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Specification: Infinity ohms
If no wiring malfunction is detected:
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Remove sensor and check sensor wheel for secure fit, damage and run-out.
If no malfunction is detected:
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Replace engine control module.