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P0420, P0430 THREE WAY CATALYST FUNCTION EC-675 < COMPONENT DIAGNOSIS > [VQ40DE] C D E F G H I J K L M A EC N P O P0420, P0430 THREE WAY CATALYST FUNCTION On Board Diagnosis Logic INFOID:0000000005273644 The ECM monitors the switching frequency ratio of air fuel ratio (A/F) DTC Confirmation Procedure INFOID:0000000005273645 NOTE: 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-III TESTING CONDITION: Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III. 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. Check 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 to 70 ° C (158 ° F). 9. Open engine hood. 10. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUPPORT” mode with CONSULT-III. 11. Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the acceler- ator pedal completely. 12. Wait 5 seconds at idle. “CMPLT” (It will take approximately 5 minutes). ° C (158 ° F) and then retest from step 1. 14. Select “SELF-DIAG RESULTS” mode with CONSULT-III. PBIB2377E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0420 Catalyst system efficien- • Three way catalyst (manifold) does not oper- ate properly. • Three way catalyst (manifold) does not have enough oxygen storage capacity. • Three way catalyst (manifold) P0430 |