2004 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure: Notes

  1. INSPECTION START 

    Do you have CONSULT-II?

    Yes or No

    Yes: GO TO 2.

    No: GO TO  3.

  2. CHECK COOLING FAN MOTOR OPERATION 

    WITH CONSULT-II 

    1. Start engine and let it idle.
    2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that cooling fan operates.

    OK or NG

    OK: GO TO  4.

    NG: Check cooling fan control circuit. (Go to PROCEDURE A ).

    Fig 1: DTC P1217 Selecting "COOLING FAN" In "ACTIVE TEST" Mode With CONSULT-II
    G02691646Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK COOLING FAN MOTOR OPERATION 

    WITH CONSULT-II 

    1. Disconnect engine coolant temperature sensor harness connector.
    2. Connect 150Ω resistor to engine coolant temperature sensor harness connector.
    3. Start engine and let it idle.
    4. Make sure that cooling fan operates.

    OK or NG

    OK: GO TO 4.

    NG: Check cooling fan control circuit. (Go to PROCEDURE A .)

    Fig 2: Connecting 150Ω Resistor To Engine Coolant Temperature Sensor Harness Connector
    G02691647Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK COOLING SYSTEM FOR LEAK 

    Apply pressure to the cooling system with a tester, and check if the pressure drops.

    Testing pressure: 157 kPa (1.6 kg/cm 2  , 23 psi) 

    CAUTION: Higher than the specified pressure may cause radiator damage. Pressure should not drop.

    OK or NG

    OK: GO TO 5.

    NG: Check the following for leak.

    • Hose
    • Radiator
    • Water pump
      Fig 3: DTC P1217 Checking Cooling System For Leak
      G02691648Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK RADIATOR CAP 

    Apply pressure to cap with a tester.

    Radiator cap relief pressure: 59-98 kPa (0.6 -1.0 kg/cm 2  , 9-14 psi) 

    OK or NG

    OK: GO TO 6.

    NG: Replace radiator cap.

    Fig 4: DTC P1217 Checking Radiator Cap
    G02691649Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK THERMOSTAT 
    1. Check valve seating condition at normal room temperatures. It should seat tightly. 
    2. Check valve opening temperature and valve lift.

      Valve opening temperature: 82°C (180°F) [standard] 

      Valve lift: More than 10.0 mm/95°C (0.394 in/203°F) 

    3. Check if valve is closed at 5°C (9°F) below valve opening temperature.

      For details, refer to THERMOSTAT AND WATER PIPING .

    OK or NG

    OK: GO TO 7.

    NG: Replace thermostat

    Fig 5: DTC P1217 Checking Thermostat
    G02691650Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to COMPONENT INSPECTION .

    OK or NG

    OK: GO TO 8.

    NG: Replace engine coolant temperature sensor.

  8. CHECK MAIN 12 CAUSES 

    If the cause cannot be isolated, go to MAIN 12 CAUSES OF OVERHEATING .

    INSPECTION END 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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