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Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> Engine (ECM) >> DTC P0451: EVAP Control System Pressure Sensor >> Confirmation Procedure
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Confirmation Procedure

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.

    >>

    GO TO 2.

  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>>

    Refer to DTC 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>>

    Refer to DTC 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>>

    Refer to DTC 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>>

    Refer to DTC Diagnosis Procedure .

    NO>>

    INSPECTION END