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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 11 (ENGINE CONTROL SYSTEM (5.6L) (DTC/CIRCUIT DIAGNOSIS) (5 OF 9))DTC/CIRCUIT DIAGNOSISDTC P0453: EVAP CONTROL SYSTEM PRESSURE SENSORDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Diagnosis Procedure
WARNING: This page is about a different variant/trim than selected.
  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 
    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

      B73

      3

      Ground

      Approx. 5

    Is the inspection result normal?

    YES

    GO TO 5.

    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

      B73

      3

      M56

      125

      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 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

      B73

      1

      M56

      148

      Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    GO TO 6.

  6. 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.

  7. 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

      B73

      2

      M56

      121

      Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    GO TO 8.

  8. 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.

  9. CHECK RUBBER TUBE 
    1. Disconnect rubber tube connected to EVAP canister vent control valve. Refer to Hydraulic Layout .
    2. Check the rubber tube for clogging.

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

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

  10. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to Component Inspection (EVAP Canister Vent Control Valve) .

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

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

  11. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to Component Inspection (EVAP Control System Pressure Sensor) .

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

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

  12. 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. Refer to Exploded View .
    2. Check if water will drain from the EVAP canister (1).
      G04138169Courtesy of NISSAN NORTH AMERICA, INC.
      • EVAP canister vent control valve (2)

    Does water drain from EVAP canister?

    YES

    GO TO 13.

    NO

    GO TO 15.

  13. 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

    GO TO 15.

    NO

    GO TO 14.

  14. 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. Refer to Exploded View .

  15. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    INSPECTION END

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.