2004 Infiniti FX35 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Check Ground Connections 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. See Figure. Refer to GROUND INSPECTION .

    OK or NG

    1. OK: Go to 2.
    2. NG: Repair or replace ground connections.

  2. Check PSP Sensor Power Supply Circuit 
    1. Disconnect PSP sensor harness connector. See Figure.
    2. Turn ignition switch ON.
    3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.

      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.
      Fig 1: Testing PSP Sensor Reference Voltage (DVOM)
      G00727493Courtesy of NISSAN MOTOR CO., U.S.A.

  3. Check PSP Sensor Ground Circuit For Open And Short 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connectors.
    3. Check harness continuity between PSP sensor terminal 3 and ECM terminal 67. Refer to wiring diagram. See Figure.

      Continuity should exist  .

    4. Also check harness for short to ground and 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 PSP Sensor Input Signal Circuit For Open And Short 
    1. Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.

      Continuity should exist  .

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

    OK or NG

    1. OK: Go to 5.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

  5. Check PSP Sensor 

    Refer to COMPONENT INSPECTION .

    OK or NG

    1. OK: Go to 6.
    2. NG: Replace PSP sensor.

  6. 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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