When Monitored and Set Condition
- When Monitored: With the engine running and no fault in the throttle valve actuator.
- Set Condition: LOW LIMIT: The ECT Sensor value is less than -39°C (-38°F ) for more than 1 second. HIGH LIMIT: The ECT Sensor value is more than 170°C (338°F) for more than 1 second. CLOSED LOOP TEMPERATURE NOT REACHED: The engine coolant temperature does not reach 15°C (60°F) in a predetermined time. Failure time varies from 2 to 20 minutes and is calculated from start up temperature, engine speed, and ambient temperature.
| Possible Causes |
| ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE |
| ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND |
| ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR GROUND CIRCUIT |
| ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN |
| SENSOR GROUND CIRCUIT OPEN |
| IMPROPER COOLANT LEVEL |
| ENGINE COOLANT THERMOSTAT |
| ENGINE COOLANT TEMPERATURE SENSOR |
| POWERTRAIN CONTROL MODULE |
For a complete Powertrain Control Module Circuit Diagram, (Refer to ENGINE - SCHEMATICS AND DIAGRAMS) .