2006 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No 

    Yes (With CONSULT-II) : GO TO 2.

    Yes (Without CONSULT-II) : GO TO  3.

    No : GO TO  3.

  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG 

    OK : INSPECTION END 

    NG : GO TO 3.

    Fig 1: Consult-II ACTIVE TEST Display Screen
    G04080452Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUNCTION OF FUEL INJECTOR-I 
    1. Turn ignition switch OFF.
    2. Disconnect harness connector F21, F201 (bank 1) and F41, F221 (bank 2).
      Fig 2: Identifying Harness Connector F21, F201 (Bank 1) And F41, F221 (Bank 2)
      G04075271Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between the following;

      harness connector F21 terminal 5 and ground,

      harness connector F41 terminal 5 and ground

      with CONSULT-II or tester.

      Voltage: Battery voltage 

    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
    7. Check harness continuity between the following terminals.
      Fig 3: Identifying Voltage Between Harness Connector F21 Terminal 5 And Ground And Harness Connector F41 Terminal 5 And Ground
      G04075272Courtesy of NISSAN MOTOR CO., U.S.A.
      HARNESS CONNECTOR TERMINAL REFERENCE

      Cylinder Harness connector terminal ECM terminal
      1 F21 terminal 3 23
      3 F21 terminal 2 22
      5 F21 terminal 1 21
      7 F21 terminal 6 44
      2 F41 terminal 3 42
      4 F41 terminal 2 41
      6 F41 terminal 1 40
      8 F41 terminal 6 63

      Continuity should exist. 

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

    OK or NG 

    OK : GO TO  5.

    NG : GO TO 4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M82, F102
    • Harness connectors F21, F201
    • Harness connectors F41, F221
    • Fuse block (J/B) connector M1
    • 15A fuse
    • Harness for open or short between harness connector F21 and fuse
    • Harness for open or short between harness connector F41 and fuse
    • Harness for open or short between harness connector F21 and ECM
    • Harness for open or short between harness connector F41 and ECM

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

  5. CHECK FUNCTION OF FUEL INJECTOR-II 

    Provide battery voltage between the following terminals, and then interrupt it. Listen to each fuel injector operating sound.

    HARNESS CONNECTOR TERMINAL REFERENCE

    Cylinder Harness connector terminal
    (+) (-)
    1 F201 5 3
    3 2
    5 1
    7 6
    2 F221 5 3
    4 2
    6 1
    8 6

    Operating sound should exist. 

    Fig 4: Identifying Function Of Fuel INJECTOR-II
    G04075273Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : INSPECTION END 

    NG : GO TO 6.

  6. CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect fuel injector harness connectors.
      Fig 5: Identifying Fuel Injector
      G04075274Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between the following terminals. Refer to Wiring Diagram.
      HARNESS CONNECTOR TERMINAL REFERENCE

      Harness connector terminal Fuel injector terminal
      F201 terminal 1 2
      F201 terminal 2
      F201 terminal 3
      F201 terminal 6
      F201 terminal 5 1
      F221 terminal 1 2
      F221 terminal 2
      F221 terminal 3
      F221 terminal 6
      F221 terminal 5 1

      Continuity should exist. 

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

    OK or NG 

    OK : GO TO 7.

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

  7. CHECK FUEL INJECTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 8.

    NG : Replace fuel injector.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

Factory Service Tools

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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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