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
| 2.1 - 2.5
|
50 (122)
| 2.3
| 0.68 - 1.00
|
90 (194)
| 0.9
| 0.236 - 0.260
|
*: These data are reference values and are measured between ECM terminals 46 (Engine coolant temperature sensor) and 26 (Sensor ground).