Component Description

NOTE: If DTC P0125 is displayed with P0117 or P0118, first perform trouble diagnosis for DTC P0117 or P0118, DTC P0117, P0118 ECT 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.

Fig 1: Identifying ECT Sensor Components

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

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Fig 2: Voltage Chart

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

Fig 3: Resistance Vs Temperature Chart

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

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.