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Home >> Infiniti >> 2007 >> G35 Base, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1212 To P2A03 (Coupe) >> DTC P1217 Engine Over Temperature >> Diagnostic Procedure >> Notes

Diagnostic Procedure: Notes

  1. INSPECTION START 

    Do you have CONSULT-II?

    Yes or No 

    Yes : GO TO 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.

    OK or NG 

    OK : GO TO 3.

    NG : Check cooling fan low speed control circuit. (Go to ,"PROCEDURE A ".)

    Fig 1: CONSULT-II Display - ACTIVE TEST
    G04180082Courtesy of NISSAN MOTOR CO., U.S.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.

    OK or NG 

    OK : GO TO  6.

    NG : Check cooling fan high speed control circuit. (Go to ,"PROCEDURE B ".)

    Fig 2: CONSULT-II Display - ACTIVE TEST
    G04180083Courtesy of NISSAN MOTOR CO., U.S.A.
  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.

    OK or NG 

    OK : GO TO 5.

    NG : Check cooling fan low speed control circuit. (Go to ,"PROCEDURE A ".)

    Fig 3: Identifying Cooling Fan
    G04180084Courtesy of NISSAN MOTOR CO., U.S.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.

    OK or NG 

    OK : GO TO 6.

    NG : Check cooling fan high speed control circuit. (Go to ,"PROCEDURE B ".)

    Fig 4: Identifying Cooling Fan
    G04180085Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK COOLING SYSTEM FOR LEAK 

    Refer to "LEAK CHECK ".

    OK or NG 

    OK : GO TO 7.

    NG : Check the following for leak.

    • Hose
    • Radiator
    • Water pump
  7. CHECK RADIATOR CAP 

    Refer to "Checking Radiator Cap ".

    OK or NG 

    OK : GO TO 8.

    NG : Replace radiator cap.

  8. CHECK THERMOSTAT 

    Refer to "WATER INLET AND THERMOSTAT ASSEMBLY ".

    OK or NG 

    OK : GO TO 9.

    NG : Replace thermostat

  9. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to ,"COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 10.

    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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