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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
[°C (°F)]
Voltage* (V)Resistance (kΩ)
–10 (14)4.47.0 - 11.4
20 (68)3.52.37 - 2.63
50 (122)2.20.68 - 1.00
90 (194)1.00.236 - 0.260
*: These data are reference values and are measured between ECM terminals.