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Home >> Infiniti >> 2006 >> G35 x >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0643 To P2A03 (Sedan) >> DTC P1217 Engine Over Temperature >> Diagnostic Procedure >> Notes
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Diagnostic Procedure: Notes

  1. INSPECTION START 

    Do you have CONSULT-II?

    Yes or No 

    1. Yes: GO TO 2.
    2. No: GO TO  4.
  2. CHECK COOLING FAN LOW SPEED OPERATION 

    With CONSULT-II 

    1. Start engine and let it idle.
    2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT- II and touch "LOW" on the CONSULT-II screen.
    3. Make sure that cooling fans-1 and -2 operate at low speed.
      Fig 1: CONSULT-II Screen Display - ACTIVE TEST Mode For Low Speed Operation
      G04120144Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Check cooling fan low speed control circuit. (Go to "PROCEDURE A ".)
  3. CHECK COOLING FAN HIGH SPEED OPERATION 

    With CONSULT-II 

    1. Touch "HIGH" on the CONSULT-II screen.
    2. Make sure that cooling fans-1 and -2 operate at higher speed than low speed.
      Fig 2: CONSULT-II Screen Display - ACTIVE TEST Mode For High Speed Operation
      G04120145Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  6.
    2. NG: Check cooling fan high speed control circuit. (Go to "PROCEDURE B ".)
  4. CHECK COOLING FAN LOW SPEED OPERATION 

    Without CONSULT-II 

    1. Start engine and let it idle.
    2. Turn air conditioner switch ON.
    3. Turn blower fan switch ON.
    4. Make sure that cooling fans-1 and -2 operate at low speed.
      Fig 3: Identifying Cooling Fan Low Speed Operation
      G04120146Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Check cooling fan low speed control circuit. (Go to "PROCEDURE A ".)
  5. CHECK COOLING FAN HIGH SPEED OPERATION 

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Turn air conditioner switch and blower fan switch OFF.
    3. Disconnect engine coolant temperature sensor harness connector.
    4. Connect 150Ω resistor to engine coolant temperature sensor harness connector.
    5. Restart engine and make sure that cooling fans-1 and -2 operate at higher speed than low speed.
      Fig 4: Identifying Cooling Fan High Speed Operation
      G04120147Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Check cooling fan high speed control circuit. (Go to "PROCEDURE B ".)
  6. CHECK COOLING SYSTEM FOR LEAK 

    Refer to "LEAK CHECK ".

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Check the following for leak.
      • Hose
      • Radiator
      • Water pump
  7. CHECK RADIATOR CAP 

    Refer to "CHECKING RADIATOR CAP ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace radiator cap.
  8. CHECK THERMOSTAT 

    Refer to "WATER INLET AND THERMOSTAT ASSEMBLY ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace thermostat
  9. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace engine coolant temperature sensor.
  10. CHECK MAIN 12 CAUSES 

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

    INSPECTION END 

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