DTC P0117, P0118: ECT Sensor: Description

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

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, Gasket And Terminal

Courtesy of NISSAN NORTH AMERICA, INC.

VOLTAGE AND RESISTANCE REFERENCE DATA

Engine coolant temperature [°C (°F)]

Voltage⁽¹⁾ (V)

Resistance (kΩ)

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.37 - 2.63

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

⁽¹⁾	These data are reference values and are measured between ECM terminals 24 (Engine coolant temperature sensor) and 23 (Sensor ground).

Fig 2: Engine Coolant Temperature Sensor Resistance Versus Temperature Graph

Courtesy of NISSAN NORTH AMERICA, INC.