Jetta GLS Wagon L4-2.0L (AZG) (2002)
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Disconnect 5-pin connector from Mass Air Flow (MAF) sensor -G70- with Intake Air Temperature (IAT) sensor -G42- (arrow).
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Check for open circuits in wires between test box and the 5-pin connector according to wiring diagram.
Terminal 1 and test box socket 26
Terminal 3 and test box socket 27
Wire resistance: max: 1.5 Ohms
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Also check wires for short circuits to each other, to vehicle Ground (GND) and to B+.
Specification: Infinity Ohms
If wiring is OK:
