2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Check Starting System 

    Turn ignition switch to START position.

    1. Does the engine turn over? 
    2. Does the starter motor operate? 

    Yes or No

    1. Yes: go to 2.
    2. No: Check starting system.. Refer to STARTERS .

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

  3. Check Camshaft Position (CMP) Sensor (PHASE) Power Supply Circuit 
    1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector. See Figure .
    2. Turn ignition switch ON.
    3. Check voltage between CMP sensor (PHASE) terminal 3 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to  5 .
    2. NG: go to 4.
      Fig 1: Testing CMP Sensor Circuit (W/DVOM)
      G00344927Courtesy of NISSAN MOTOR CO., U.S.A.

  4. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E211, M41
    • Harness connectors F102, M82
    • Harness for open or short between camshaft position sensor (PHASE) and ECM
    • Harness for open or short between camshaft position sensor (PHASE) and IPDM E/R
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  5. Check CMP Sensor (PHASE) Ground Circuit For Open And Short 
    1. Turn ignition switch OFF.
    2. Check harness continuity between CMP sensor (PHASE) terminal 1 and ground.
      1. Continuity should exist  .
    3. Also check harness for short to power.

    OK or NG

    1. OK: go to  7 .
    2. NG: go to 6.

  6. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors F102, M82
    • Harness for open or short between CMP sensor (PHASE) and ground
      1. Repair open circuit or short to power in harness or connectors.

  7. Check CMP Sensor (PHASE) Input Signal Circuit For Open And Short 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 14 and CMP sensor (PHASE) terminal 2.

      Refer to wiring diagram. See Fig 1 .

      1. Continuity should exist  .
    3. Also check harness for short to ground or short to power.

    OK or NG

    1. OK: go to 8.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

  8. Check Camshaft Position Sensor (PHASE) 

    Refer to COMPONENT INSPECTION  .

    OK or NG

    1. OK: go to 9.
    2. NG: Replace camshaft position sensor (PHASE).

  9. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. Inspection end 
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.