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Home >> Infiniti >> 2016 >> QX50 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnostic Trouble Codes (DTCS) (P0447-P2138) >> DTC/Circuit Diagnosis >> DTC P0452: EVAP Control System Pressure Sensor Low Input >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  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 STEP 2  .

    NO 

    Repair or replace ground connection.

  2. CHECK CONNECTOR

    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check sensor harness connector for water.
      Water should not exist.

    Is the inspection result normal?

    YES 

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

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    GO TO STEP 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.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 3 M107 107 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    GO TO STEP 5  .

  5. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors M117, B201
    • 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 Name Connector Terminal
    F101 45 Brake booster pressure sensor E48 1
    46 CKP sensor (POS) F2 1
    M107 103 APP sensor E112
    (Without ICC)    		 6
    E116
    (With ICC)    		 3
    107 EVAP control system pressure sensor B252 3
    Refrigerant pressure sensor E77 3

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

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

  7. CHECK COMPONENTS

    Check the following:

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Replace malfunctioning component.

  8. CHECK APP SENSOR

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 15  .

    NO 

    GO TO STEP 9  .

  9. REPLACE ACCELERATOR PEDAL ASSEMBLY

    1. Replace accelerator pedal assembly. Refer to REMOVAL AND INSTALLATION .
    2. Go to 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.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 1 M107 112 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 12  .

    NO 

    GO TO STEP 11  .

  11. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors B201, M117
    • 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.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B252 2 M107 102 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 14  .

    NO 

    GO TO STEP 13  .

  13. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors B201, M117
    • 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 STEP 15  .

    NO 

    Replace EVAP control system pressure sensor. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .

  15. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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