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EC-726 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE OK >> GO TO 10. NG >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets. 10. 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 12. NG >> GO TO 11. 11. 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 malfunctioning part. 12. CHECK IGNITION TIMING Check the following items. Refer to OK or NG OK >> GO TO 13. NG >> Follow the 13. CHECK AIR FUEL RATIO SENSOR 1 INPUT SIGNAL FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between A/F sensor 1 terminals and ECM terminals as per the following. Refer to Wiring Diagram. At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi) Items Specifications Target idle speed 650 ± 50 rpm (in P or N position) Ignition timing 15 ± 5 ° BTDC (in P or N position) ALBIA0360ZZ 1. A/F sensor 1 (bank 2) harness connector 2. A/F sensor 1 (bank 2) 3. A/F sensor 1 (bank 1) 4. A/F sensor 1 (bank 1) harness connector 2011 Pathfinder |