2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Procedure A

  1. CHECK COOLING FAN POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relay-1.
    3. Turn ignition switch ON.
    4. Check voltage between cooling fan relay-1 terminals 1, 3, 6 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage Between Cooling Fan Relay-1 Terminals 1, 3, 6 And Ground
      G00787175Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Battery voltage 

      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
    • 15A fuse
    • 40A fusible links
    • Harness for open or short between cooling fan relay-1 and fuse
    • Harness for open or short between cooling fan relay-1 and battery
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  3. CHECK COOLING FAN MOTORS CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan motor-1 harness connector and cooling fan motor-2 harness connector.
      Fig 2: Locating Cooling Fan Motors 1 & 2
      G00787176Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check harness continuity between cooling fan relay-1 terminal 5 and cooling fan motor-1 terminal 2, cooling fan motor-1 terminal 3 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-1 terminal 7 and cooling fan motor-2 terminal2, cooling fan motor-2 terminal 3 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 35 and cooling fan relay-1 terminal 2. Refer to Wiring Diagram.

      Continuity should exist. 

    3. 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, F17
    • Harness for open or short between cooling fan relay-1 and ECM
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK COOLING FAN RELAY-1 

    Check continuity between cooling fan relay-1 terminals 3 and 5, 6 and 7 under the following conditions.

    Fig 3: Checking Continuity Between Relays
    G00787177Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Supply battery voltage between the following terminals and check operation.

    Fig 4: Checking Cooling Fan Motors-1 And -2
    G00787178Courtesy 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 

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END 
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  • • 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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