Jetta L4-2.0L (AEG) (2000)
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Disconnect 5-pin harness connector from Mass Air Flow (MAF) sensor -G70- with Intake Air Temperature (IAT) sensor -G42- (arrow).
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Check wiring between test box and 5-pin harness connector -1- for open circuit according to wiring diagram.
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Terminal -1- + socket 40
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Terminal -3- + socket 12
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Wire resistance: max. 1.5 ohms
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Check wiring additionally for short circuit to battery positive (B+).
Specified value: Infinity ohms
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If no malfunction is found in wiring:
Perform resistance measurement on Intake Air Temperature (IAT) sensor -G42-, terminals -1- (signal) and 3 (Ground (GND)).