Engine Coolant Temperature Sensor

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.

Fig 1: Checking Resistance Between Engine Coolant Temperature Sensor Terminals 1 & 2

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

Reference data

ECT SENSOR - ENGINE COOLANT TEMPERATURE AND RESISTANCE SPECIFICATIONS (DTC P0128)

Engine coolant temperature °C (°F)	Resistance kΩ
20(68)	2.1 - 2.9
50(122)	0.68 - 1.00
90(194)	0.236 - 0.260

If NG, replace engine coolant temperature sensor.

Fig 2: Temperature/Resistance Graph
Courtesy of NISSAN MOTOR CO., U.S.A.