Passat Sedan V6-2792cc 2.8L DOHC (AAA) SFI (1997)
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Connect VAG 1598/18 test box to ECM wiring harness (arrow).
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Disconnect 2-pin connector (arrow) at Intake Air Temperature (IAT) sensor -G72-.
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Check wiring between test box and 2-pin connector for open circuit according to wiring diagram.
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Terminal 1 and test box socket 36.
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Terminal 2 and test box socket 33.
Resistance: max. 1.5 ohms.
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Check wire between ECM connector and 2-pin connector terminal 2 for short circuit to wire terminal 1 and to vehicle Ground (GND), according
to wiring diagram.
Terminal 2 and test box socket 36.
Specification: infinite ohms.
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Additionally, check both wires for short circuit to battery positive (B+).
Specification: infinite ohms.
If no malfunction in wire is detected:
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Perform resistance measurement on IAT sensor -G72- terminals 1 and 2, resistance values See Fig. 1.