Engine Coolant Temperature Sensor
- Ensure engine is cold. Connect scan tool to Data Link connector (DLC) located in center console, in front of shift lever. Start engine and allow it to idle.
- With scan tool in READ TEST VALUE BLOCK function, select group "01" and read coolant temperature value in field No. 2 of scan tool. Temperature value must increase uniformly without interruption. If value increases as specified, select END OUTPUT function on scan tool.
- If displayed value does not change or if engine malfunctions during certain temperature range, turn ignition off and disconnect ECT sensor connector. Measure ECT sensor resistance. See ECT SENSOR RESISTANCE table.
- If resistance is not as specified, check circuit using PIN VOLTAGE CHARTS article. If necessary, replace ECT sensor. After repairs, erase DTC memory (if applicable) and select END OUTPUT function on scan tool.
ECT SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 86 (30) | 1500-2000 |
| 104 (40) | 1000-1500 |
| 122 (50) | 800-1000 |
| 140 (60) | 500-700 |
| 158 (70) | 375-500 |
| 176 (80) | 275-375 |
| 194 (90) | 225-275 |