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Home >> Nissan-Datsun >> 2012 >> Versa SL, 4D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0181 To P0507 (Hatchback) >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Grounds
      G08275578Courtesy 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 (1) harness connector.
      Fig 2: Identifying EVAP Canister, EVAP Canister Vent Control Valve & EVAP Control System Pressure Sensor
      G08275579Courtesy 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 COMPONENTS POWER SUPPLY

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

    ECM terminal Sensor terminal Wiring Diagram
    74 Refrigerant pressure sensor terminal 3 "WIRING DIAGRAM "
    75 Crankshaft position sensor (POS) terminal 1 "WIRING DIAGRAM "
    76 EVAP control system pressure sensor terminal 3 "WIRING DIAGRAM "
    102 APP sensor terminal 5 "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.

  5. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly. Refer to "REMOVAL AND INSTALLATION ".

    : INSPECTION END 

  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace EVAP control system pressure sensor. Refer to "EXPLODED VIEW ".

  8. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    : INSPECTION END