DTC P0116: ECT Sensor: Description

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 Sensor, Gasket And Terminal

Courtesy of NISSAN NORTH AMERICA, INC.

Engine coolant temperature [°C (°F)]

Voltage⁽¹⁾ (V)

Resistance (kΩ)

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.10 - 2.90

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

⁽¹⁾	This data is reference values and is measured between ECM terminal 46 (Engine coolant temperature sensor) and ground.

Fig 2: Resistance And Temperature Graph

Courtesy of NISSAN NORTH AMERICA, INC.

CAUTION: Never 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.