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P0420, P0430 THREE WAY CATALYST FUNCTION EC-885 < DTC/CIRCUIT DIAGNOSIS > [VK50VE] C D E F G H I J K L M A EC N P O Diagnosis Procedure INFOID:0000000005237361 1. CHECK EXHAUST SYSTEM Visually check exhaust tubes and muffler for dents. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace malfunctioning part. 2. CHECK EXHAUST GAS LEAKAGE 1. Start engine and run it at idle. 2. Listen for an exhaust gas leakage before the three way catalyst (manifold). Is exhaust gas leakage detected? YES >> Repair or replace malfunctioning part. NO >> GO TO 3. 3. CHECK INTAKE AIR LEAKAGE Listen for an intake air leakage after the mass air flow sensor. YES >> Repair or replace malfunctioning part. NO >> GO TO 4. 4. CHECK IDLE SPEED AND IGNITION TIMING Check idle speed and ignition timing. EC-576, "BASIC INSPECTION : Special Repair Requirement" Is the inspection result normal? YES >> GO TO 5. NO >> Follow the EC-576, "BASIC INSPECTION : Special Repair Requirement" . 5. CHECK FUEL INJECTORS 1. Stop engine and then turn ignition switch ON. 2. Check the voltage between ECM harness connector terminals as per the following. PBIB1216E ECM Voltage + – Connector Terminal Connector Terminal F110 17 M160 128 Battery voltage 21 25 29 33 37 41 45 |