Engine Oil Temperature Sensor

WARNING: This page is about a different car, the 2011 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.

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.

Fig 1: Identifying Gasket And Terminal Of Engine Coolant Temperature Sensor

Courtesy of NISSAN MOTOR CO., U.S.A.

< Reference data >

TEMPERATURE AND RESISTANCE SPECIFICATION CHART

Engine oil temperature [°C (°F)]

Voltage⁽¹⁾ (V)

Resistance (kΩ)

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

110 (230)

0.6

0.143 - 0.153

⁽¹⁾	These data are reference values and are measured between ECM terminals 78 (Engine oil temperature sensor) and 84 (Sensor ground).

Fig 2: Identifying Thermistor Resistance Vs Temperature Characteristics Graph

Courtesy of NISSAN MOTOR CO., U.S.A.