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Home >> Nissan-Datsun >> 2007 >> Sentra Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0181 To P0500 (MR20DE) >> DTC P0452 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 screws on the body.

      Refer to "GROUND INSPECTION ".

      • Body ground (1)

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

    Fig 1: Identifying Body Ground
    G04925191
  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 sensor harness connector for water.

      Water should not exist. 

    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
    G04925106
  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 5V 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

    Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 And Ground
    G04875257
  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 E3, F2
    • 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.

  6. CHECK POWER SUPPLY CIRCUITS 

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

    ECM TERMINAL CHART

    ECM terminal Sensor terminal Reference 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 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  11.

    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 51. 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 E3, F2
    • 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 42 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 E3, F2
    • 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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