Jetta V6-2.8L (BDF) (2002)
If the voltage supply and wiring is OK.:
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Connect multimeter to measure voltage at connector terminal 4 and engine ground (GND).
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Switch on ignition
Specification: at least 4.5 V
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Switch off ignition.
If no voltage is present:
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Check the signal and ground (GND) wires for Mass Air Flow (MAF) sensor.
See:
Checking signal and ground (GND) wires for Mass Air Flow (MAF) sensor
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Remove wiper arms and cowl panel:
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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 5-pin connector referring to Electrical Wiring Diagrams.
Terminal 3 and socket 27
Terminal 4 and socket 53
Terminal 5 and socket 29
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: