Component Description

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.See Figure .

Fig 1: Identifying Engine Coolant Temperature Sensor

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

Fig 2: Engine Coolant Temperature/Voltage/Resistance Specifications

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

*: These data are reference values and are measured between ECM terminal 93 (Engine coolant temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.