Exhaust System Temperature Indicator: Testing and Inspection

Fig. 13a Heat hazard sensor light.:

Circuit Test
1. Turn the ignition on. The heat hazard warning light comes on.
2. Start the engine the warning light should go off Fig. 13,.

Fig. 7 Heat hazard sensor.:

3. Disconnect the sensor, Fig. 7, make sure the warning light comes on when a jumper wire is connected to both terminals of the connector.

Sensor test
1. Remove sensor, then wrap sensor and a thermometer with aluminum foil and place into a suitable container filled with oil.
2. Connect battery voltage and test lamp to the electrical connector sensor terminals.
3. Using a suitable heater, gradually heat the oil. Test lamp should illuminate when oil temperature is between 221-239°F (105-115°C). Do not exceed 302°F (150°C).
4. If sensor does not operate within specified limit, replace heat hazard sensor.