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EC-260 < COMPONENT DIAGNOSIS > [QR25DE] P0420 THREE WAY CATALYST FUNCTION • It will take at most 3 minutes until “INCMP” of “CATALYST” changes to “CMPLT”. 9. Check 1st trip DTC. With GST 1. Activate “INSPECTION MODE 1” ( ) to start engine, and warm up engine to 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. Turn ignition switch ON (READY). 6. Repeat following procedure 3 times. - Drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive minutes. NOTE: Keep the vehicle speed as steady as possible during the cruising. - Stop vehicle. NOTE: Never turn ignition switch OFF. 7. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004211497 1. CHECK EXHAUST SYSTEM Visually check exhaust tubes and muffler for dent. YES >> GO TO 2. NO >> Repair or replace. 2. CHECK EXHAUST GAS LEAK 1. Activate “INSPECTION MODE 1” ( ) to start engine. 2. Listen for an exhaust gas leak before the three way catalyst (manifold). Is exhaust gas leak detected? YES >> Repair or replace. NO >> GO TO 3. 3. CHECK INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. YES >> Repair or replace. NO >> GO TO 4. 4. CHECK IDLE SPEED AND IGNITION TIMING 1. Check idle speed. - For procedure, refer to EC-14, "IDLE SPEED : Special Repair Requirement" - For specification, refer to 2. Check ignition timing. - For procedure, refer to EC-14, "IGNITION TIMING : Special Repair Requirement" . JMBIA0163GB |