Golf L4-1.9L DSL Turbo (ALH) (1999)
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Check wiring between test box and connector for open circuit according to wiring diagram.
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Wire resistance: max. 1.5 ohms
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Additionally check wires for short to one another, to vehicle ground and to battery positive (B+).
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Specification: Infinity ohms
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If no wiring malfunction is detected, replace engine control module.