Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body.
  
  Fig 1: Locating Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Refer to Ground Inspection .
OK or NG
1. OK >> GO TO 2.
2. NG >> Repair or replace ground connections.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to Component Inspection .

OK or NG
1. OK >> GO TO 3.
2. NG >> Replace engine coolant temperature sensor.
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow.

OK or NG
1. OK >> GO TO 4.
2. NG >> Repair or replace thermostat.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. >> INSPECTION END