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P0420 THREE WAY CATALYST FUNCTION EC-289 < COMPONENT DIAGNOSIS > [QR25DE FOR CALIFORNIA] C D E F G H I J K L M A EC N P O YES >> GO TO 8. NO >> Check ignition coil, power transistor and their circuits. Refer to . 8. CHECK SPARK PLUG Check the initial spark plug for fouling, etc. YES >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to . NO >> Repair or clean spark plug. Then GO TO 9. 9. CHECK FUNCTION OF IGNITION COIL-III 1. Reconnect the initial spark plugs. 2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion. Is the inspection result normal? YES >> INSPECTION END NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to . 10. CHECK FUEL INJECTOR 1. Turn ignition switch OFF. 2. Remove fuel injector assembly. EM-36, "Removal and Installation" Keep fuel hose and all fuel injectors connected to fuel tube. 3. Disconnect all ignition coil harness connectors. 4. Reconnect all fuel injector harness connectors disconnected. 5. Turn ignition switch ON. YES >> GO TO 11. NO >> Replace the fuel injector(s) from which fuel is dripping. 11. CHECK INTERMITTENT INCIDENT GI-42, "Intermittent Incident" . Is the inspection result normal? YES >> Replace three way catalyst assembly. NO >> Repair or replace harness or connector. SEF156I Spark should be generated. |