Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Check Ground Connections
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws. Refer to GROUND INSPECTION .
1. OK or NG
2. OK: GO TO 2.
3. 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 under 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 WATER CONTROL VALVE .
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END