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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (3.7L) (DTC/CIRCUIT DIAGNOSIS) (4 OF 9)DTC/CIRCUIT DIAGNOSISDTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSORDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Diagnosis Procedure
  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M11, M95. Refer to Circuit Inspection .

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace error-detected parts.

  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 error-detected parts.

  3. 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

      Voltage (V)

      Connector

      Terminal

      Connector

      Terminal

      B73

      3

      B73

      1

      Approx. 5

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    GO TO 4.

  4. CHECK EVAP CONTROL 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

      M124

      148

      Existed

      3

      125

    Is the inspection result normal?

    YES

    Refer to Intermittent Incident .

    NO

    Repair or replace error-detected parts.

  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT 
    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

      M124

      121

      Existed
    2. 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 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.