Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
<Reference data>
| Engine coolant temperature [°C (°F)] | Voltage* (V) | Resistance (kΩ) |
|---|---|---|
| -10 (14) | 4. 4 | 7. 0 - 11. 4 |
| 20 (68) | 3. 5 | 2. 37 - 2. 63 |
| 50 (122) | 2. 2 | 0. 68 - 1. 00 |
| 90 (194) | 0. 9 | 0. 236 - 0. 260 |
*: These data are reference values and are measured between ECM terminals.