Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 1995 Mazda 929. However, it is still accessible from the selected car via links, so may be relevant.
Remove engine coolant temperature sensor. Place sensor and thermometer in container of coolant. Connect ohmmeter to sensor terminals. Slowly heat coolant. Note resistance at specified temperatures. See ECT SENSOR RESISTANCE table. Replace sensor as necessary.
ECT SENSOR RESISTANCE
| Temperature | Ohms |
|---|---|
| 68°F (20°C) | 2200-2700 |
| 104°F (40°C) | 1000-1300 |
| 140°F (60°C) | 500-650 |
| 176°F (80°C) | 200-400 |