2004 Infiniti FX45FACTORY 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 Crankshaft Position (CKP) Sensor (POS) Power Supply Circuit 
    1. Disconnect crankshaft position (CKP) sensor (POS) harness connector. See Figure .
    2. Turn ignition switch ON.
    3. Check voltage between CKP sensor (POS) terminal 3 and ground with CONSULT-II or tester.
      Fig 1: Testing Crankshaft Position Sensor Circuit Voltage (W/DVOM)
      G00344916Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to  4 .
    2. NG: go to 3.

  3. Detect Malfunctioning Part 

    Check the following.

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

  4. Check CKP Sensor (POS) Ground Circuit For Open And Short 
    1. Turn ignition switch OFF.
    2. Check harness continuity between CKP sensor (POS) terminal 1 and ground.

      Refer to wiring diagram. See Figure .

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

    OK or NG

    1. OK: go to  6 .
    2. NG: go to 5.

  5. Detect Malfunctioning Part 

    Check the following.

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

  6. Check CKP Sensor (POS) Input Signal Circuit For Open And Short 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 13 and CKP sensor (POS) terminal 2.

      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 7.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

  7. Check Crankshaft Position Sensor (POS) 

    Refer to COMPONENT INSPECTION  .

    OK or NG

    1. OK: go to 8.
    2. NG: Replace crankshaft position sensor (POS).

  8. Check Gear Tooth 

    Visually check for chipping signal plate gear tooth.

    OK or NG

    1. OK: go to 9.
    2. NG: Replace the signal plate.

  9. 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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