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EC-230 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE] P0420, P0430 THREE WAY CATALYST FUNCTION • It might cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is made. NOTE: When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal- functioning. OK or NG OK >> GO TO 10. NG >> GO TO 7. 7. CHECK FUNCTION OF IGNITION COIL-II 1. Turn ignition switch OFF. 2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion. OK or NG OK >> GO TO 8. NG >> Check ignition coil, power transistor and their circuits. Refer to 8. CHECK SPARK PLUG Check the initial spark plug for fouling, etc. OK >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to . NG >> 1. Repair or clean spark plug. 2. GO TO 9. 9. CHECK FUNCTION OF IGNITION COIL-III 1. Reconnect the initial spark plugs. 2. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and the grounded portion. OK or NG OK >> INSPECTION END NG >> 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-47, "Removal and Installation" Keep fuel hose and all fuel injectors connected to fuel tube. 3. Reconnect all fuel injector harness connectors. 4. Disconnect all ignition coil harness connectors. 5. Turn ignition switch ON. Check that fuel does not drip from fuel injector. OK or NG OK (Does not drip.)>>GO TO 11. NG (Drips.)>>Replace the fuel injector(s) from which fuel is dripping. Refer to . 11. CHECK INTERMITTENT INCIDENT Spark should be generated. SEF156I Spark should be generated. 2011 Pathfinder |