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DTC P0420 THREE WAY CATALYST FUNCTION EC-299 [KA24DE] C D E F G H I J K L M A EC DTC P0420 THREE WAY CATALYST FUNCTION PFP:20905 On Board Diagnosis Logic UBS00D74 The ECM monitors the switching frequency ratio of heated oxygen DTC Confirmation Procedure UBS00D75 NOTE: ● Open engine hood before conducting following procedure. ● Do not hold engine speed more than specified minutes below. With CONSULT-II 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 5 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. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUP- 6. Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecu- 7. Wait 5 seconds at idle. PBIB0067E DTC No. Trouble diagnosis name DTC detecting condition Possible Cause P0420 Catalyst system efficiency below ● Three way catalyst (manifold) does not ● Three way catalyst (manifold) does not ● Three way catalyst (manifold) ● Exhaust tube ● Intake air leaks ● Fuel injector ● Injector leaks ● Spark plug ● Improper ignition timing PBIB0822E |