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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (ENGINE CONTROL SYSTEM (5.6L) (DTC/CIRCUIT DIAGNOSIS) (4 OF 9))DTC/CIRCUIT DIAGNOSISDTC P0451: EVAP CONTROL SYSTEM PRESSURE SENSORDTC LOGICDTC CONFIRMATION PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

DTC Confirmation Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION DTC Confirmation Procedure
WARNING: This page is about a different variant/trim than selected.
NOTE: Never remove fuel filler cap during DTC confirmation procedure.
  1. PRECONDITIONING 

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

    With CONSULT

    GO TO 2 .

    Without CONSULT

    GO TO 5 .

  2. PERFORM DTC CONFIRMATION PROCEDURE-1 

    SYMBOL With CONSULT

    1. Start engine and let it idle for least 40 seconds.
      NOTE: Do not depress accelerator pedal even slightly.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    GO TO 3 .

  3. PERFORM DTC CONFIRMATION PROCEDURE-2 

    SYMBOL With CONSULT

    1. Select "EVAP DIAG READY" in "DATA MONITOR" mode of "ENGINE".
    2. Let it idle until "OFF" of "EVAP DIAG READY" changes to "ON".
      NOTE: It will take at most 2 hours until "OFF" of "EVAP DIAG READY" changes to "ON".
    3. Turn ignition switch OFF and wait at least 90 minutes.
      NOTE: Never turn ignition switch ON during 90 minutes.
    4. Turn ignition switch ON.
    5. Select "EVAP LEAK DIAG" in "DATA MONITOR" mode of "ENGINE".
    6. Check that "EVAP LEAK DIAG" indication.

    Which is displayed on CONSULT?

    CMPLT

    GO TO 4 .

    YET

    1. Perform DTC CONFIRMATION PROCEDURE again.
    2. GO TO 1 .
  4. PERFORM DTC CONFIRMATION PROCEDURE-3 

    SYMBOL With CONSULT

    Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    INSPECTION END

  5. PERFORM DTC CONFIRMATION PROCEDURE-4 

    SYMBOL With GST

    1. Start engine and let it idle for least 40 seconds.
      NOTE: Do not depress accelerator pedal even slightly.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    GO TO 6 .

  6. PERFORM DTC CONFIRMATION PROCEDURE-5 

    SYMBOL With GST

    1. Let it idle for at least 2 hours.
    2. Turn ignition switch OFF and wait at least 90 minutes.
      NOTE: Never turn ignition switch ON during 90 minutes.
    3. Turn ignition switch ON.
    4. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    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.