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P0420 THREE WAY CATALYST FUNCTION ECM-273 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace error-detected parts. Refer to . 2. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before the three way catalyst (manifold). Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace error-detected parts. Refer to . 3. CHECK INTAKE AIR LEAK AND PCV HOSE 1. Start engine and let it idle. 2. Listen for an intake air leak after the mass air flow sensor. Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace error-detected parts. Refer to . 4. CHECK IGNITION TIMING AND IDLE SPEED Check the following items. Refer to . Is the inspection result normal? YES >> GO TO 5. NO >> Follow the . 5. CHECK FUEL INJECTOR Check the fuel injector. Refer to ECM-372, "Component Function Check" . Is the inspection result normal? YES >> GO TO 6. NO >> Perform ECM-372, "Diagnosis Procedure" . 6. CHECK FUNCTION OF IGNITION COIL-1 CAUTION: Do the following procedure in the place where ventilation is good without the combustible. Turn ignition switch OFF. 2. Remove fuel pump fuse in IPDM E/R to release fuel pressure. 3. Start engine. 4. After engine stalls, crank it two or three times to release all fuel pressure 5. Turn ignition switch OFF. 6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils. 1: Three way catalyst 2: A/F sensor 1 3: HO2S2 4: Muffler PBID0288J |