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Home >> Infiniti >> 2009 >> FX50 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0453 (VK50VE) >> DTC P0452: EVAP Control System Pressure Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check that water is not inside connectors.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness connector.

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch ON.
    2. Check the voltage between EVAP control system pressure sensor harness connector and ground.
      VOLTAGE REFERENCE CHART

      EVAP control system pressure sensor Ground Voltage (V)
      Connector Terminal
      B252 3 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 4.

  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
      CONTINUITY REFERENCE CHART

      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 3 F111 95 Existed

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B201, M117
    • Harness connectors M116, F103
    • Harness for open between ECM and EVAP control system pressure sensor

      Repair open circuit.

  6. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM SENSOR CONNECTOR TERMINAL REFERENCE CHART

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F111 87 Crankshaft position sensor F2 1
    91 Camshaft position sensor (bank 1) F84 1
    EVT control position sensor (bank 1) F59 1
    95 Battery current sensor E21 1
    EVAP control system pressure sensor B252 3
    Manifold pressure sensor F65 3
    M160 99 APP sensor 2 (Without ICC) E112 6
    APP sensor 2 (With ICC) E116 3

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair short to ground or short to power in harness or connectors.

  7. CHECK COMPONENTS

    Check the following.

  8. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  15.

    NO: GO TO 9.

  9. REPLACE ACCELERATOR PEDAL ASSEMBLY
    1. Replace accelerator pedal assembly
    2. Perform "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

  10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
      CONTINUITY REFERENCE CHART

      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 1 F111 70 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 11.

  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B201, M117
    • Harness connectors M116, F103
    • Harness for open or short between EVAP control system pressure sensor and ECM

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

  12. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
      CONTINUITY REFERENCE CHART

      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 2 F111 80 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  14.

      NO: GO TO 13.

  13. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B201, M117
    • Harness connectors M116, F103
    • Harness for open or short between EVAP control system pressure sensor and ECM

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

  14. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 15.

    NO: Replace EVAP control system pressure sensor.

  15. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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