Component Inspection (2.5L)

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Engine Coolant Temperature Sensor

Check resistance between engine coolant temperature sensor terminals No. 1 and 2 as shown. See Fig 1.
If "NG", replace engine coolant temperature sensor.

Fig 1: Inspecting Engine Coolant Temperature Sensor For DTC P0128 (2.5L)

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