Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Check wiring between test box and 2- pin connector -1- for open circuit according to wiring diagram.
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Terminal 1 + Socket 85
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Terminal 2 + Socket 108
Wire resistance: max. 1.5 Ohms
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Additionally check both wires for short to battery positive.
Specification: Infinity Ohms
If no wiring malfunctions are detected:
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Perform resistance measurement at intake air temperature sender (G42) contacts 1 (signal) and 2 (Ground).