2004 Infiniti FX35 AWDFACTORY OEM SERVICE PROCEDURE

Procedure B

  1. Check Cooling Fan Power Supply Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connectors E6.
    3. Check voltage between IPDM E/R terminal 16 and ground with CONSULT-II or tester.
      Fig 1: Testing Power To Cooling Fan Relays
      G00727211Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 

      OK or NG

      1. OK: Go to 3.
      2. NG: Go to 2.

  2. Detect Malfunctioning Part 

    Check the following.

    • 40A fusible link
    • Harness for open or short between IPDM E/R and battery
      1. Repair open circuit or short to ground in harness or connectors.

  3. Check Cooling Fan Ground Circuit 
    1. Turn ignition switch OFF.
    2. Check harness continuity between IPDM E/R terminal 15 and ground.

      Refer to wiring diagram. see WIRING DIAGRAM .

      1. Continuity should exist  .
    3. Also check harness for short to power.

      OK or NG

      1. OK: Go to 4.
      2. NG: Repair open circuit or short to power in harness or connectors.

  4. Check Cooling Fan Motor-1 Circuit-I 
    1. Disconnect cooling fan motor-1 harness connector. See Figure.
    2. Check voltage between cooling fan motor-1 terminals 1, 2 and ground with CONSULT-II or tester.
      Fig 2: Testing Power To Cooling Fan Motor 1
      G00727213Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 

      OK or NG

      1. OK: Go to 6.
      2. NG: Go to 5.

  5. Detect Malfunctioning Part 

    Check the following.

    • 40A fusible link
    • Harness connectors E29, E121
    • Harness for open or short between cooling fan motor-1 and battery
      1. Repair open circuit or short to ground in harness or connectors.

  6. Check Cooling Fan Motor-1 Circuit-II 
    1. Disconnect IPDM E/R harness connector E6.
    2. Check harness continuity between cooling fan motor-1 terminal 3 and IPDM E/R terminal 13, cooling fan motor-1 terminal 4 and IPDM E/R terminals 10, 12.

      Refer to Wiring diagram. See WIRING DIAGRAM .

      1. Continuity should exist  .
    3. Also check harness for short to ground and short to power.

      OK or NG

      1. OK: Go to 8.
      2. NG: Go to 7.

  7. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E29, E121
    • Harness for open or short between cooling fan motor-1 and IPDM E/R
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  8. Check Cooling Fan Motor-2 Circuit-I 
    1. Disconnect cooling fan motor-2 harness connector.
    2. Check harness continuity between cooling fan motor-2 terminals 3, 4 and ground.

      Refer to Wiring diagram. See WIRING DIAGRAM .

      1. Continuity should exist  .

    3. Also check harness short to power.

      OK or NG

      1. OK: Go to 10.
      2. NG: Go to 9.

  9. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E29, E121
    • Harness for open or short between cooling fan motor-2 and ground
      1. Repair open circuit or short to power in harness or connectors.

  10. Check Cooling Fan Motor-2 Circuit-II 
    1. Check harness continuity between cooling fan motor-2 terminal 1 and IPDM E/R terminal 8, cooling fan motor-2 terminal 2 and IPDM E/R terminals 11, 14.

      Refer to wiring diagram. See WIRING DIAGRAM .

      1. Continuity should exist  .

    2. Also check harness for short to ground and short to power.

      OK or NG

      1. OK: Go to 12.
      2. NG: Go to 11.

  11. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E29, E121
    • Harness for open or short between cooling fan motor-2 and IPDM E/R
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  12. Check Cooling Fan Motors 

    Refer to COMPONENT INSPECTION .

    OK or NG

    1. OK: Go to 13.
    2. NG: Replace cooling fan motors.

  13. Check Intermittent Incident 

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG

    1. OK: Replace IPDM E/R. Refer to COMPONENT LOCATIONS .
    2. NG: Repair or replace harness or connector.

Factory Service Tools

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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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