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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 7) >> Engine (ECM) >> P0452 EVAP Control System Pressure Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E191. Refer to Ground Inspection in Refer to Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 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 3.

    NO>>

    Repair or replace harness connector.

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY 
    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
      B108 3 Ground Approx. 5

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    GO TO 4.

  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    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
      B108 3 E152 177 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    Check sensor power supply 3 circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair or replace error-detected parts.

  5. 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
      B108 1 E152 200 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    Repair or replace error-detected parts.

  6. 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
      B108 2 E152 173 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

    Repair or replace error-detected parts.

  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Check EVAP control system pressure sensor. Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace EVAP control system pressure sensor. Refer to EVAP CANISTER : Exploded View .

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