2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Check DTC With TCM 

    Refer to ON BOARD DIAGNOSTIC (OBD) SYSTEM .

    OK or NG

    1. OK: go to 2.
    2. NG: Repair or replace.

  2. Check Starting System 

    Turn ignition switch OFF, then turn it to START.

    Does starter motor operate? 

    Yes or No

    1. Yes: go to 3.
    2. No: Refer to STARTERS .

  3. Check PNP Switch Input Signal Circuit For Open And Short-I 
    1. Turn ignition switch OFF.
    2. Disconnect TCM harness connector.
    3. Disconnect unified meter and A/C amp. harness connector.
    4. Check harness continuity between TCM terminal 9 and unified meter and A/C amp. terminal 32.

      Refer to wiring diagram. See Figure .

      1. Continuity should exist  .
    5. 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.

    • Harness connectors F102, M82
    • Harness for open or short between TCM and unified meter and A/C amp."
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  5. Check PNP Switch Input Signal Circuit For Open And Short-II 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 102 and unified meter and A/C amp. terminal 25.

      Refer to wiring diagram. See Figure .

      1. 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 Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    OK or NG

    1. OK: go to 7.
    2. NG: Repair or replace.

  7. Replace Unified Meter And A/C AMP 

    Refer to UNIFIED METER AND A/C AMP .

    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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