Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to , "GROUND INSPECTION ".
  
  Fig 1: Locating Body Ground Screws E24, E15, F9 And E133
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK : GO TO 2.

NG : Repair or replace ground connections.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to , "COMPONENT INSPECTION ".

OK or NG

OK : GO TO 3.

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

OK : GO TO 4.

NG : Repair or replace thermostat. Refer to , "THERMOSTAT AND THERMOSTAT HOUSING ".
CHECK INTERMITTENT INCIDENT
Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

Refer to , "WIRING DIAGRAM ".

: INSPECTION END