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Home >> Nissan-Datsun >> 2009 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0443 To P0643 (Qr25DE) >> DTC P0452 EVAP Control System Pressure Sensor >> Diagnosis Procedure
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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 Ground Connection, Washer Tank, Fuse And Fusible Link Box
      G05924003Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK CONNECTOR
    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 that water is not inside connectors.

      OK or NG 

      OK: GO TO 3.

      NG: Repair or replace harness connector.

      Fig 2: Identifying EVAP Control System Pressure Sensor, EVAP Canister And EVAP Canister Vent Control Valve
      G04925106Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch ON.
    2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-III or tester.

      Voltage: Approximately 5 V 

      OK or NG 

      OK: GO TO  11.

      NG: GO TO 4.

      Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 And Ground
      G04875257Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between EVAP control system pressure sensor terminal 3 and ECM terminal 76. Refer to WIRING DIAGRAM .

      Continuity should exist  .

      OK or NG 

      OK: GO TO  6.

      NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B9, E13
    • Harness for open between EVAP control system pressure sensor and ECM

      Repair open circuit.

  6. CHECK POWER SUPPLY CIRCUITS

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

    ECM TERMINAL REFERENCE CHART

    ECM terminal Sensor terminal Reference Wiring Diagram
    72 Refrigerant pressure sensor terminal 3 "WIRING DIAGRAM "
    76 Crankshaft position sensor (POS) terminal 1 "WIRING DIAGRAM "
    87 APP sensor terminal 5 "WIRING DIAGRAM "
    91 EVAP control system pressure sensor terminal 3 "WIRING DIAGRAM "

    OK or NG 

    OK: GO TO 7.

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

  7. CHECK REFRIGERANT PRESSURE SENSOR

    Refer to TROUBLE DIAGNOSIS .

    OK or NG 

    OK: GO TO 8.

    NG: Replace refrigerant pressure sensor.

  8. CHECK CRANKSHAFT POSITION SENSOR (POS)

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Replace crankshaft position sensor (POS).

  9. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  16.

    NG: GO TO 10.

  10. 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 

  11. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 96. Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

      OK or NG 

      OK: GO TO  13.

      NG: GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B9, E13
    • Harness for open or short between EVAP control system pressure sensor and ECM

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

  13. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between ECM terminal 86 and EVAP control system pressure sensor terminal 2. Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

      OK or NG 

      OK: GO TO  15.

      NG: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B9, E13
    • Harness for open or short between ECM and EVAP control system pressure sensor

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

  15. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 16.

    NG: Replace EVAP control system pressure sensor.

  16. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    INSPECTION END 

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