Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 7) >> Engine (ECM) >> P0453 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 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 RUBBER TUBE 
    1. Disconnect rubber tube connected to EVAP canister vent control valve.
    2. Check the rubber tube for clogging.

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    Clean the rubber tube using an air blower, repair or replace rubber tube.

  8. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Replace EVAP canister vent control valve. Refer to EVAP CANISTER : Exploded View .

  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

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

    YES>>

    GO TO 10.

    NO>>

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

  10. CHECK IF EVAP CANISTER IS SATURATED WITH WATER 
    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
    2. Check if water will drain from the EVAP canister SYMBOL .
      GNSDB106259Courtesy of NISSAN NORTH AMERICA, INC.
      SYMBOL : EVAP canister vent control valve

    Does water drain from EVAP canister?

    YES>>

    GO TO 11.

    NO>>

    INSPECTION END

  11. CHECK EVAP CANISTER 

    Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

    The weight should be less than 2.1 kg (4.6 lb).

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    GO TO 12.

  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • EVAP canister for damage
    • EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

    >>

    Repair hose or replace EVAP canister.

scientia non olet · About Mike's Workshop Manuals