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.

Fig 1: Identifying Engine COOLANT Temperature Sensor Components

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

Reference data

Fig 2: Identifying Engine COOLANT Temperature Sensor Thermistor Specifications

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

For thermistor specifications in graph format, see Figure .

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.