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EC-212 < COMPONENT DIAGNOSIS > [VQ40DE] P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE 2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion. OK or NG OK >> GO TO 9. NG >> Check ignition coil, power transistor and their circuits. Refer to . 9. 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 10. 10. 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. OK or NG OK >> INSPECTION END NG >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to . 11. CHECK COMPRESSION PRESSURE Check compression pressure. Refer to . OK or NG OK >> GO TO 12. NG >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets. 12. CHECK FUEL PRESSURE 1. Install all removed parts. 2. Release fuel pressure to zero. Refer to 3. Install fuel pressure gauge and check fuel pressure. Refer to OK or NG OK >> GO TO 14. NG >> GO TO 13. 13. DETECT MALFUNCTIONING PART Check the following. • Fuel pump and circuit (Refer to • Fuel pressure regulator (Refer to • Fuel lines • Fuel filter for clogging >> Repair or replace. Spark should be generated. SEF156I Spark should be generated. At idle: Approx. 350 kPa (3.57 kg/cm 2 , 51 psi) 2010 Pathfinder |