2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws. See Figure .
    1. : GO TO 2.
  2. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect electric throttle control actuator harness connector. See Figure .
    2. Turn ignition switch ON.
    3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage Between Electric Throttle Control Actuator Terminal 1 And Ground
      G00787441Courtesy of NISSAN MOTOR CO., U.S.A.

    Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  3. CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between electric throttle control actuator terminal 5 and engine ground.

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-20
    • Harness for open or short between electric throttle control actuator and ECM
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 83 and electric throttle control actuator terminal 4, ECM terminal 84 and electric throttle control actuator 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: Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK THROTTLE POSITION SENSOR 

    Refer to Component Inspection, COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO  8 .
    2. NG: GO TO 7.
  7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 
    1. Replace the electric throttle control actuator.
    2. Perform THROTTLE VALVE CLOSED POSITION LEARNING  .
    3. Perform IDLE AIR VOLUME LEARNING  .
    1. : INSPECTION END
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END
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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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