Coolant Temperature Sensor
- Unplug harness from ECA and install Breakout Box. Leave processor disconnected. Unplug ECT sensor connector. Measure resistance from pin 7 to 40 and from 7 to 60.
- Resistance should be more than 10,000 ohms. If resistance is less, check wiring harness for a short to ground. Measure resistance directly across sensor. Values should be as specified in Coolant Temperature Sensor Resistance table. If not, replace sensor.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Resistance (Ohms) |
|---|---|
| 50 (10) | 58,750 |
| 65 (18) | 40,500 |
| 180 (83) | 3600 |
| 220 (105) | 1840 |