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Home >> Infiniti >> 2007 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ35DE) - DTCS P0448 To P1212 >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screw on the body. Refer to "GROUND INSPECTION ".
    Fig 1: Identifying Body Ground, Steering Column And Blower Motor
    G05216434Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  2.

    NG: Repair or replace ground connections.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER 
    1. Disconnect EVAP control system pressure sensor harness connector.
      Fig 2: Identifying EVAP Canister, EVAP Control System Pressure Sensor And Muffler
      G05216183Courtesy of NISSAN NORTH AMERICA, INC.
    2. Check sensor harness connector for water.

      Water should not exist. 

    OK or NG 

    OK: GO TO  3.

    NG: Repair or replace harness connector.

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  4.

    NG: Replace EVAP control system pressure sensor.

  4. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    For Wiring Diagram, refer to WIRING DIAGRAM .

    >> INSPECTION END