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Home >> Nissan-Datsun >> 2012 >> Sentra Base, Automatic CVT Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0447 To P1148 (MR20DE) (CALIFORNIA) >> 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 ".

    • ←: Vehicle front
    • Body ground (1)
    Fig 1: Identifying Body Ground
    G04925191Courtesy 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.
      • This illustration is a view from under vehicle
      • EVAP canister (2)
      • EVAP canister vent control valve (3)
    2. Check sensor harness connector for water.

    Water should not exist  .

    Fig 2: Identifying EVAP Control System Pressure Sensor, EVAP Canister And EVAP Canister Vent Control Valve
    G04925106Courtesy of NISSAN NORTH AMERICA, INC.

    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. Refer to , "REMOVAL AND INSTALLATION ".

  4. CHECK POWER SUPPLY CIRCUITS

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

    ECM terminal Sensor terminal Reference Wiring Diagram
    69 Tumble control valve position sensor terminal 1 "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 5.

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

  5. CHECK TUMBLE CONTROL VALVE POSITION SENSOR

    Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace intake manifold adapter. Refer to , "COMPONENT ".

  6. CHECK REFRIGERANT PRESSURE SENSOR

    Refer to TROUBLE DIAGNOSIS .

    OK or NG 

    OK: GO TO 7.

    NG: Replace refrigerant pressure sensor. Refer to , "REMOVAL AND INSTALLATION FOR REFRIGERANT PRESSURE SENSOR ".

  7. CHECK CRANKSHAFT POSITION SENSOR (POS)

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace crankshaft position sensor (POS). Refer to , "COMPONENT ".

  8. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  10.

    NG: GO TO 9.

  9. REPLACE ACCELERATOR PEDAL ASSEMBLY

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

    INSPECTION END 

  10. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    For wiring diagram, refer to "WIRING DIAGRAM ".

    INSPECTION END 

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