With Generic Scan Tool

Exhaust Gas Temperature Sensor, Checking






Special Tools and Equipment
- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31

Checking voltage supply
- Switch ignition off.







- Remove bolts (arrows) and remove engine covers -A- through -C-.
- Disconnect connector at respective exhaust gas temperature sensor.







- Connect VAG1527B voltage tester as follows:

Harness connector Measure to
Terminal
3 Engine Ground(GND)

- Operate starter briefly.
LED must light up.

If LED does not light up:
- Perform the following tests marked with dots:







- Check Fuse in fuse holder -S234- (position 34).
- Check wire connection from exhaust gas temperature sensor via Fuse in fuse holder -S234- (position 34) to Fuel Pump (FP) relay for open circuit.
- Check Fuel Pump (FP) relay.

- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM.
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector VAG1598/31 test box
Terminal Socket
1(Bank 1) 61
1(Bank 2) 20
2 50

If wire connection is OK:
- Replace exhaust gas temperature sensor.

If the same malfunction occurs again after replacing the exhaust gas temperature sensor:
- Replace Engine Control Module (ECM) -J220-.