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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 5) >> Engine (ECM) >> DTC P0430: Three Way Catalyst Function >> Confirmation Procedure
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Confirmation Procedure

  1. INSPECTION START 
    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.

    Will CONSULT be used?

    YES

    GO TO 2.

    NO

    GO TO 6.

  2. PERFORM DTC CONFIRMATION PROCEDURE-I 

    SYMBOL WITH CONSULT

    TESTING CONDITION:

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

    1. Start engine and warm it up to the 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 keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    6. Let engine idle for 1 minute.
    7. Select "DATA MONITOR" mode with CONSULT.
    8. Check that "COOLAN TEMP/S" indicates more than 70 deg.C (158 deg.F).

      If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70 deg.C (158 deg.F).

    9. Open engine hood.
    10. Select "DTC & SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT.
    11. Rev engine between 2, 000 and 3, 000 rpm and hold it for 3 consecutive minutes then release the accelerator pedal completely.
    12. Check the indication of "CATALYST".

    Which is displayed on CONSULT screen?

    CMPLT

    GO TO 5.

    INCMP

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE-II 
    1. Wait 5 seconds at idle.
    2. Rev engine between 2, 000 and 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 5.

    NO

    GO TO 4.

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

    GO TO 2.

  5. PERFORM DTC CONFIRMATION PROCEDURE-III 

    Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Refer to DTC Diagnosis Procedure .

    NO

    INSPECTION END

  6. PERFORM COMPONENT FUNCTION CHECK 

    SYMBOL WITH GST

    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.
    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    4. Let engine idle for 1 minute.
    5. Open engine hood.
    6. Check the voltage between ECM harness connector terminals under the following conditions.

      DTC

      ECM

      Condition

      Voltage

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      P0420

      F92

      84

      [HO2S2 (bank 1)]

      F91

      43

      Keeping engine speed at 2, 500 rpm constant under no load

      The voltage fluctuation cycle takes more than 5 seconds.

      • 1 cycle: 0.6 - 1.0 -> 0 - 0.3 -> 0.6 - 1.0

      P0430

      77

      [HO2S2 (bank 2)]

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Refer to DTC Diagnosis Procedure .

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