Checking wiring
- Disconnect connector to Intake Air Temperature (IAT) sensor -G42-.
- Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See ELECTRICAL TESTING USING VAG1598/31 TEST BOX .
- Check for open circuit, short to positive, or short to ground in following wiring connections:
IAT SENSOR CIRCUIT CHECK: TERMINAL 1, 2 & SOCKET 85, 108
| Connector terminal | Test box V.A.G 1598/31 Socket |
|---|---|
| 1 | 85 |
| 2 | 108 |
- Test for short circuits between two wires.
- Repair any open/short circuit as necessary.
If no wiring problems are found: