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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0463 >> DTC P0452: EVAP Control System Pressure Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. 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 2.

    NO: Repair or replace harness connector.

  2. 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.
    EVAP control system pressure sensor Ground Voltage (V)
    Connector Terminal
    C17 3 Ground Approx. 5

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 3.

  3. 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.
    EVAP control system pressure sensor ECM Continuity
    Connector Terminal Connector Terminal
    C17 3 E80 133 Existed

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open between ECM and EVAP control system pressure sensor
    • Loose or poor connection for each connector and harness

    : Repair open circuit.

  5. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F110 76 Crankshaft position sensor F74 1
    77 Camshaft position sensor (bank 1) F84 1
    E80 133 EVAP control system pressure sensor C17 3
    Battery current sensor E63 2
    Refrigerant pressure sensor E77 1
    131 APP sensor 2 (Without ICC) E110 1
    APP sensor 2 (with ICC) E67 9

    Is the inspection result normal? 

    YES: GO TO 6.

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

  6. CHECK COMPONENTS

    Check the following.

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace malfunctioning component.

  7. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  14.

    NO: GO TO 8.

  8. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly.

    Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION "

    (Without distance control assist system)

    Refer to "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (With distance control assist system).

    : INSPECTION END

  9. 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.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      C17 1 E80 150 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between EVAP control system pressure sensor and ECM
    • Loose or poor connection for each connector and harness

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

  11. 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.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      C17 2 E80 143 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between EVAP control system pressure sensor and ECM
    • Loose or poor connection for each connector and harness

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

  13. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION (EVAP CONTROL SYSTEM PRESSURE SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace EVAP control system pressure sensor. Refer to "EXPLODED VIEW ".

  14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT "

    : INSPECTION END

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