The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine oil 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.

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<Reference data>

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Engine oil 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)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
110 (230)
0.6
0.143 - 0.153
*: These data are reference values and are measured between ECM terminals 27 (Engine oil temperature sensor) and 26 (Sensor ground).