Jetta GLS L4-1.8L Turbo (AWD) (2001)
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Check wiring between test box and 4-pin connector contact 3 for short circuit to wire contact 4 and to vehicle Ground using wiring diagram.
Contact 3 + socket 108
Contact 3 + vehicle Ground
Specification: Infinity ohms
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Additionally check both wires for short to battery positive.
If no fault in wire is detected:
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Perform resistance measurement on Engine Coolant Temperature (ECT) sensor (G62) contact C (signal) and D (Ground).
Scale A shows resistance values for temperature range 0 - 50 °C and scale B the values for temperature range 50 - 100 °C.
Examples:
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30 °C is in range A and corresponds to a resistance of 1.5 - 2.0 kOhms
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80 °C is in range B and corresponds to a resistance of 275 - 375 ohms
If the specification is not obtained:
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Replace Engine Coolant Temperature (ECT) sensor (G62).
If there is no fault in the wiring and the resistance measurement values are OK.:
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Replace engine electronics control module.