Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace ground connections.
  
  Fig 1: Retightening Two Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
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. Refer to "THERMOSTAT AND THERMOSTAT HOUSING ".
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END