Engine Coolant Temperature Sensor
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 | Voltage* | Resistance |
|---|---|---|
| - 10°C (14°F) | 4.4 V | 7.0 - 11.4 kΩ |
| 20°C (68°F) | 3.5 V | 2.37 - 2.63 kΩ |
| 50°C (122°F) | 2.2 V | 0.68 - 1.00 kΩ |
| 90°C (194°F) | 0.9 V | 0.236 - 0.260 kΩ |
*: These data are reference values on the diagnosis tool.