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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 7) >> Engine (ECM) >> P0430 Three Way Catalyst Function >> Confirmation Procedure

Confirmation Procedure

  1. INSPECTION START 

    Do you have CONSULT '

    YES>>

    GO TO 2.

    NO>>

    GO TO 7.

  2. 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.

    TESTING CONDITION:

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

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE-I 

    SYMBOL With CONSULT

    1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
    2. Start engine and warm it up to the normal operating temperature.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Turn ignition switch ON.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    7. Let engine idle for 1 minute.
    8. Make sure that "COOLAN TEMP/S" indicates 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).

    9. Open engine hood.
    10. Select "DTC and SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT.
    11. Rev engine up to about 2, 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 6.

    INCMP>>

    GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE-II 
    1. Wait 5 seconds at idle.
    2. Rev engine up to about 2, 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>>

    Refer to DTC Diagnosis Procedure .

    NO>>

    INSPECTION END

  7. PERFORM 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.

    SYMBOL Without CONSULT

    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 condition.
      DTC ECM Condition Voltage
      Connector + -
      Terminal Terminal
      P0430 F143 51
      [HO2S2 (bank 2)]      		 81 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

    Is the inspection result normal?

    YES-1>>

    To check malfunction symptom before repair: Refer to Inspection .

    YES-2>>

    Confirmation after repair: INSPECTION END

    NO>>

    Refer to DTC Diagnosis Procedure .

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