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Home >> Nissan-Datsun >> 2009 >> Cube Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0181 To P0607 >> DTC P0420: Three Way Catalyst Function >> DTC Logic >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. INSPECTION START

    Do you have CONSULT-III?

    Do you have CONSULT-III? 

    YES: GO TO 2.

    NO: GO TO  7.

  2. 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.

    TESTING CONDITION: 

    Do not hold engine speed for more than the specified minutes below. 

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE-I

    With CONSULT-III 

    1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
    2. Start engine and warm it up to normal operating temperature.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
    5. Let engine idle for 1 minute.
    6. Make sure that "COOLAN TEMP/S" indication is more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches 70°C (158°F).
    7. Open engine hood.
    8. Select "DTC & SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT-III.
    9. Rev engine up to 2, 000 to 3, 000 RPM and hold it for 3 consecutive minutes then release the accelerator pedal completely.
    10. Check the indication of "CATALYST".

      Which is displayed on CONSULT-III screen? 

      CMPLT: GO TO  6.

      INCMP: GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE-II
    1. Wait 5 seconds at idle.
    2. Rev engine up to 2, 000 to 3, 000 RPM and maintain it until "INCMP" of "CATALYST" changes to "CMPLT" (It will take approximately 5 minutes).

    Does the indication change to "CMPLT"? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. PERFORM DTC CONFIRMATION PROCEDURE AGAIN
    1. Stop engine and cool it down to less than 70°C (158°F).
    2. Perform DTC CONFIRMATION PROCEDURE again.

    GO TO  3.

  6. PERFORM DTC CONFIRMATION PROCEDURE-III

    Check 1st trip DTC.

    Is 1st trip DTC detected? 

    YES: Go to "DIAGNOSIS PROCEDURE ".

    NO: INSPECTION END

  7. PERFORM COMPONENT FUNCTION CHECK

    Perform component function check. Refer to "COMPONENT FUNCTION CHECK ".

    NOTE: Use component function check to check the overall function of the three way catalyst (manifold). During this check, a 1st trip DTC might not be confirmed.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".