Jetta Sedan V6-2.8L (BDF) (2003)
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Connect VAG 1598/31 test box to control module wiring harness. The Motronic Engine Control Module (ECM) -J220- remains disconnected.
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Check wiring for open circuit between test box and 4-pin connector referring to Electrical Wiring Diagrams.
Terminal 3 and socket 93
Terminal 4 and socket 108
Wire resistance: max. 1.5 ohms
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Additionally check wiring for short to one another, to vehicle ground (GND) and to battery positive.
Specification: infinity ohms
If no wiring malfunction is detected:
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Perform resistance measurement on Engine Coolant Temperature (ECT) sensor -G62- terminal C (signal) and D (ground).
Scale A shows resistance values for temperature range 0 to 50 degrees C and scale B the values for temperature range 50 to 100 degrees C.
Examples: