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EC-870 < COMPONENT DIAGNOSIS > [MR18DE] P0420 THREE WAY CATALYST FUNCTION P0420 THREE WAY CATALYST FUNCTION DTC Logic INFOID:0000000001161837 DTC DETECTION LOGIC The ECM monitors the switching frequency ratio of heated oxygen 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 >> 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 the 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” 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). 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 10. Check the indication of “CATALYST”. SEF484YF 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) |