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HOMESERVICE MANUALSINFINITI2006FX35 AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (ENGINE CONTROL SYSTEM - DTCS P0451 TO P1212 (VK45DE))DTC P0643 SENSOR POWER SUPPLYDIAGNOSTIC PROCEDURE
2006 Infiniti FX35 AWD

Diagnostic Procedure

2006 Infiniti FX35 AWDSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2006 Infiniti FX45. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Ground Connections Of Blower Motor And Steering Column
      G04075075Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO 2.

    NG : Repair or replace ground connections.

  2. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Identifying Accelerator Pedal Position Sensor
      G04075076Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between APP sensor terminal 6 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

    OK or NG 

    OK : GO TO  5.

    NG : GO TO 3.

    Fig 3: Identifying Voltage Between APP Sensor Terminal 6 And Ground With CONSULT-II Or Tester
    G04075077Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK SENSOR POWER SUPPLY CIRCUITS 

    Check harness for short to power and short to ground, between the following terminals.

    TERMINALS REFERENCE WIRING DIAGRAM CHART

    ECM terminal Sensor terminal Reference Wiring Diagram
    90 APP sensor terminal 6 WIRING DIAGRAM 
    48 EVAP control system pressure sensor terminal 3 WIRING DIAGRAM 
    49 Refrigerant pressure sensor terminal 1 WIRING DIAGRAM
    68 PSP sensor terminal 1 WIRING DIAGRAM 

    OK or NG 

    OK : GO TO 4.

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

  4. CHECK COMPONENTS 

    Check the following.

    OK or NG 

    OK : GO TO  7.

    NG : Replace malfunctioning component.

  5. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO  7.

    NG : GO TO 6.

  6. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
    3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
    4. Perform "IDLE AIR VOLUME LEARNING ".

      : INSPECTION END 

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

RENDER: 1.0x

NO RELATED

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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.