LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2017 >> QX60 Base, FWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (Except Hybrid) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> DTC Description >> DTC Confirmation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC 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.

    With CONSULT 

    GO TO STEP 2  .

    With GST 

    GO TO STEP  5.

  2. PERFORM DTC CONFIRMATION PROCEDURE-I

    G-20With 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 DTC P0451 detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO 

    GO TO STEP 3  .

  3. PERFORM DTC CONFIRMATION PROCEDURE-II

    G-20With CONSULT 

    1. On CONSULT screen, select "ENGINE">>"Data Monitor">>"EVAP DIAG READY".
    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. On CONSULT screen, select "ENGINE">>"Data Monitor">>"EVAP LEAK DIAG".
    6. Check that "EVAP LEAK DIAG" indication.

    Which is displayed on CONSULT?

    CMPLT 

    GO TO STEP 4  .

    YET 

    1. Perform DTC CONFIRMATION PROCEDURE again.
    2. GO TO STEP  1.

  4. PERFORM DTC CONFIRMATION PROCEDURE-III

    G-20With CONSULT 

    Check 1st trip DTC.

    Is DTC P0451 detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO-1 

    To check malfunction symptom before repair: Refer to INTERMITTENT INCIDENT .

    NO-2 

    Confirmation after repair: INSPECTION END

  5. PERFORM DTC CONFIRMATION PROCEDURE-IV

    NSM020With 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 DTC P0451 detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO 

    GO TO STEP 6  .

  6. PERFORM DTC CONFIRMATION PROCEDURE-V

    NSM020With 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 DTC P0451 detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO-1 

    To check malfunction symptom before repair: Refer to INTERMITTENT INCIDENT .

    NO-2 

    Confirmation after repair: INSPECTION END

scientia non olet · About LEMON Manuals