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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check Ground Connections 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. See Figure. Refer to GROUND INSPECTION .

    OK or NG

    1. OK: Go to 2.
    2. NG: Repair or replace ground connections.

  2. Check Engine Coolant Temperature Sensor 

    Refer to COMPONENT INSPECTION .

    OK or NG

    1. OK: Go to 3.
    2. NG: Replace engine coolant temperature sensor.

  3. 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 WATER INLET AND THERMOSTAT ASSEMBLY .

  4. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    Refer to WIRING DIAGRAM .

    1. Inspection end 
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