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EC-190 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE] P0171, P0174 FUEL INJECTION SYSTEM FUNCTION OK >> GO TO 12. NG >> Perform trouble diagnosis for FUEL INJECTOR, refer to EC-399, "Component Description" 11. CHECK FUNCTION OF FUEL INJECTOR 1. Start engine. 2. Listen to fuel injectors No.2, No.4, No.6 operating sound. OK or NG OK >> GO TO 12. NG >> Perform trouble diagnosis for FUEL INJECTOR, refer to EC-399, "Component Description" . 12. CHECK FUEL INJECTOR 1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle. 2. Turn ignition switch OFF. 3. Disconnect all injector harness connectors. 4. Remove fuel tube assembly. Refer to EM-47, "Removal and Installation" . Keep fuel hose and all fuel injectors connected to fuel tube. 5. For DTC P0171, reconnect fuel injector harness connectors on bank 1. For DTC P0174, reconnect fuel injector harness connectors on bank 2. 6. Disconnect all ignition coil harness connectors. 7. Prepare pans or saucers under each fuel injector. 8. Crank engine for about 3 seconds. For DTC P0171, make sure that fuel sprays out from fuel injec- tors on bank 1. For DTC P0174, make sure that fuel sprays out from fuel injec- tors on bank 2. OK or NG OK >> GO TO 13. NG >> Replace fuel injectors from which fuel does not spray out. Refer to EM-47, "Removal and Installation" replace O-ring with new ones. 13. CHECK INTERMITTENT INCIDENT GI-37, "Intermittent Incident" >> INSPECTION END Clicking noise should exist. PBIB1986E Fuel should be sprayed evenly for each fuel injector. PBIB1726E 2011 Pathfinder |