2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Procedure B

  1. CHECK COOLING FAN POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relays-2 and -3.
    3. Turn ignition switch ON.
    4. Check voltage between cooling fan relays-2 and1, 3 terminals 1,3 and ground with CONSULT-II or tester.
    Fig 1: Checking Voltage Between Cooling Fan Relays And Ground
    G00787179Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  3 .
    2. NG: GO TO 2.
  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-8
    • Joint connector-9
    • Harness for open or short between cooling fan relays-2 and -3 and joint connectors-8, -9
    1. : Repair harness or connectors.
  3. CHECK COOLING FAN CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan motor-1 harness connector and cooling fan motor-2 harness connector.
    3. Check harness continuity between cooling fan relay-2 terminal 5 and cooling fan motor-1 terminal 1, cooling fan relay-2 terminal 7 and cooling fan motor-1 terminal 4, cooling fan relay-2 terminal 6 and body ground. Refer to Wiring Diagram.

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.
    5. Check harness continuity between cooling fan relay-3 terminal 5 and cooling fan motor-2 terminal 1, cooling fan relay-3 terminal 7 and cooling fan motor-2 terminal 4, cooling fan relay-3 terminal 6 and body ground. Refer to Wiring Diagram.

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK COOLING FAN OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 36 and cooling fan relay-2 terminal 2, cooling fan relay-3 terminal 2. Refer to Wiring Diagram.
    3. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  6 .
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E8, E17
    • Joint connector-10
    • Harness for open or short between cooling fan relays-2 and -3 and ECM
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK COOLING FAN RELAYS-2 AND -3 

    Check continuity between cooling fan relay-2, -3 terminals 3 and 5, 6 and 7 under the following conditions. See Figure .

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace cooling fan relays.
  7. CHECK COOLING FAN MOTORS 

    Supply battery voltage between the following terminals and check operation.

    Fig 2: Checking Cooling Fan Motors
    G00787181Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace cooling fan motors.
  8. CHECK INTERMITTENT INCIDENT 
    1. Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .
    1. : INSPECTION END
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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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