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Home >> Infiniti >> 2020 >> QX50 Essential, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (5 Of 12) >> DTC/Circuit Diagnosis >> DTC P0441: EVAP Control System >> DTC Description >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. PRECONDITIONING 

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    Will CONSULT be used?

    YES

    GO TO 2.

    NO

    GO TO 5.

  2. PERFORM DTC CONFIRMATION PROCEDURE-1 

    SYMBOL With CONSULT

    TESTING CONDITION:

    Always perform test at a temperature of 5 deg.C (41 deg.F) or more.

    1. Start the engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Turn ignition switch ON.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Start engine and let it idle for at least 70 seconds.
    6. Select "PURG FLOW P0441" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode of "ENGINE" using CONSULT.
    7. Touch "START".

    Is "COMPLETED" displayed on CONSULT screen?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE-2 

    When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 35 seconds.)

    Selector lever

    Suitable position

    VHCL SPEED SE

    32 - 120 km/h (20 - 75 MPH)

    ENG SPEED

    500 - 3, 300 rpm

    B/FUEL SCHDL

    1.0 - 6.5 msec

    COOLANT TEMP/S

    More than 0 deg.C (32 deg.F)
    CAUTION: Always drive vehicle at a safe speed.
    NOTE: If "TESTING" does not change for a long time, retry from step 2.

    Is "COMPLETED" displayed on CONSULT screen?

    YES

    GO TO 4.

    NO

    Perform DTC CONFIRMATION PROCEDURE again. GO TO 2.

  4. PERFORM DTC CONFIRMATION PROCEDURE-3 

    Touch "SELF-DIAG RESULTS".

    Is "OK" displayed on CONSULT screen?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    Proceed to Diagnosis Procedure .

  5. PERFORM COMPONENT FUNCTION CHECK 
    NOTE: Use component function check to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

    SYMBOL With GST

    1. Lift up drive wheels.
    2. Start engine (VDC switch OFF) and warm it up to normal operating temperature.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Start engine and wait at least 70 seconds.
    5. Set voltmeter probes to ECM harness connector terminals as per the following.

      ECM

      Connector

      +

      -

      Terminal

      E16

      131

      158
    6. Check EVAP control system pressure sensor value at idle speed and note it.
    7. Establish and maintain the following conditions for at least 1 minute.

      Air conditioner switch

      ON

      Headlamp switch

      ON

      Rear window defogger switch

      ON

      Engine speed

      Approx. 3, 000 rpm

      Selector lever position

      Any position other than P, N or R
    8. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (measured at step 6) for at least 1 second.

    Is the inspection result normal?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    Proceed to Diagnosis Procedure .

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