Possible Causes
| POSSIBLE CAUSES |
|---|
| LOW COOLANT LEVEL |
| THERMOSTAT |
| ECT SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| ECT SIGNAL CIRCUIT SHORTED TO GROUND |
| ECT SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT |
| ECT SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE |
| SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| ENGINE COOLANT TEMPERATURE (ECT) SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .