Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Remove engine coolant temperature sensor.
3. Check resistance between engine coolant temperature sensor terminals under the following conditions.
  
  Fig 1: Checking Engine Coolant Temperature Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK or NG
1. OK: INSPECTION END
2. NG: Replace engine coolant temperature sensor.