2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Inspection Start 

    Which malfunction (P0102 or P0103) is duplicated?

    P0102 or P0103

    1. P0102: go to  2 .
    2. P0103: go to  3 .

  2. Check Intake System 

    Check the following for connection.

    • Air duct
    • Vacuum hoses
    • Intake air passage between air duct to intake manifold

    OK or NG

    1. OK: go to  3 .
    2. NG: Reconnect the parts.

  3. 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  4 .
    2. NG: Repair or replace ground connections.

  4. Check Maf Sensor Power Supply Circuit 
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.

      For mass air flow sensor & intake air temperature sensor location, see Figure .

    3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage At Mass Air Flow Sensor Terminals 2 & 4 (W/DVOM)
      G00344661Courtesy of NISSAN MOTOR CO., U.S.A.
Chapter Navigation
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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.