Exhaust Temperature Sensor: Testing and Inspection

Inspection (Warning system)
1. Turn the ignition switch to ON and verify that the heat hazard warning light illuminates.
2. Start the engine and verify that the warning lamp goes out.
3. Disconnect the heat hazard sensor connector.




4. Check that the heat hazard warning light illuminates on when a jumper wire is connected to the terminals of the sensor connector (harness side).

Removal
1. Remove the right front seat.
2. Lift up the floor mat.
3. Disconnect the heat hazard sensor connector and remove the sensor.

Installation
Install in the reverse order of removal.




Inspection (Sensor)
1. Wrap the sensor and a thermometer in aluminum foil and place them in a container of oil.
2. Connect a test lamp and battery positive voltage to the terminals of the sensor connector as shown.
3. Gradually heat the oil.
4. Verify that the test lamp comes on when the temperature in the aluminum foil reaches 95-105°C (203-221°F).
5. Replace the sensor if necessary.