2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

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. Disconnect cooling fan relays-2 and -3.
      Fig 1: Identifying Cooling Fan Relays 1, 2 And 3
      G00787165Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Perform COOLING FAN in ACTIVE TEST mode with CONSULT-II.
      Fig 2: Displaying CONSULT-II Active Test Cooling Fan Screen
      G00787166Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Make sure that cooling fans-1 and -2 operate at low speed.

    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. Turn ignition switch OFF.
    2. Reconnect cooling fan relays -2 and -3.
    3. Turn ignition switch ON.
    4. Perform COOLING FAN in ACTIVE TEST mode with CONSULT-II.
      Fig 3: Displaying CONSULT-II Active Test Cooling Fan Screen
      G00787167Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Make sure that cooling fans-1 and -2 operate at high speed.

    OK or NG 

    1. OK: GO TO  11 .
    2. NG: Check cooling fan high speed control circuit. (Go to PROCEDURE B  .)
  4. CHECK COOLING FAN LOW SPEED OPERATION 

    Without CONSULT-II

    1. Disconnect cooling fan relays-2 and -3.
      Fig 4: Identifying Cooling Fan Relays 1, 2 And 3
      G00787168Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Start engine and let it idle.
    3. Set temperature lever at full cold position.
    4. Turn air conditioner switch ON.
    5. Turn blower fan switch ON.
    6. Make sure that cooling fans-1 and -2 operate at low speed.
      Fig 5: Checking Cooling Fan Low Speed Operation
      G00787169Courtesy of NISSAN MOTOR CO., U.S.A.
    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. Reconnect cooling fan relays-2 and -3.
    3. Turn air conditioner switch and blower fan switch OFF.
    4. Disconnect engine coolant temperature sensor harness connector.
    5. Connect 150ohm resistor to engine coolant temperature sensor harness connector.
    6. Restart engine and make sure that cooling fans-1 and -2 operate at high speed.
      Fig 6: Checking Cooling Fan High Speed Operation
      G00787170Courtesy of NISSAN MOTOR CO., U.S.A.
      1. OK: GO TO 6.
      2. NG: Check cooling fan high speed control circuit. (Go to PROCEDURE B  ).
  6. 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.
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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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