FUEL SYSTEM


  1. OUTLINE


    1. The 2UR-GSE engine uses the Direct injection 4-stroke gasoline engine Superior version (D-4S) system which has both direct and port type fuel injectors. This system optimally controls the fuel injectors for direct injection and port injection according to engine load. The system achieves improved engine performance, fuel economy and clean emissions.

    2. A fuel returnless system is used. This system controls the fuel pressure for the low-pressure part of the fuel system using a pressure regulator installed in the fuel tank assembly. However, the unused fuel from the high pressure fuel pump and the fuel from the relief valve return to the fuel tank assembly.

    3. Fuel cut control is used to stop the fuel pump (for low pressure) when any of the SRS airbags has deployed.

    4. In order to ensure excellent serviceability, quick connectors are used to connect the fuel pipes to the fuel hoses.

    5. High pressure slit-nozzle type fuel injectors are used for direct injection.

  2. MAIN FEATURES


    1. D-4S System


      1. The Direct injection 4-stroke gasoline engine Superior version (D-4S) system is based on 2 types of fuel injection systems: the direct injection system and the port injection system.

      2. The direct injection system mainly consists of the fuel pump with seal sub-assemblies (for high pressure), delivery pipes (for direct injection), and direct fuel injector assemblies. In this system, the ECM controls the high pressure fuel pumps and direct fuel injector assemblies via the injector drivers (EDUs: Electronic Driver Units) based on signals from various sensors, optimally controlling fuel pressure, injection volume, and injection timing.

      3. The port injection system mainly consists of the fuel pump (for low pressure), delivery pipes (for port injection), and port fuel injector assemblies. In this system, the ECM controls the port fuel injector assemblies based on signals from various sensors, optimally controlling injection volume and timing.

      4. Fuel sent from the fuel tank assembly is delivered to the low pressure and high pressure fuel systems. The fuel delivered to the low pressure fuel system is injected from the port fuel injector assemblies to the intake ports.

      5. The fuel delivered to the high pressure fuel system is pressurized by the high pressure fuel pumps and injected from the direct fuel injector assemblies to the combustion chambers.

        A004D99C03
        *1 ECM *2 No. 1 EDU (Injector Driver)
        *3 No. 2 EDU (Injector Driver) *4 No. 2 Fuel Delivery Pipe Sub-assembly (for Port Injection)
        *5 Fuel Delivery Pipe Sub-assembly (for Port Injection) *6 Port Fuel Injector Assembly
        *7 Fuel Delivery Pipe LH (for Direct Injection) *8 Fuel Delivery Pipe RH (for Direct Injection)
        *9 Direct Fuel Injector Assembly *10 Fuel Pump with Seal Sub-assembly (for High Pressure)
        *11 Fuel Pressure Pulsation Damper *12 Intake Camshaft (Cam to Drive Fuel Pump)
        *13 Fuel Tank Assembly *14 Fuel Pump (for Low Pressure)
        *15 Jet Pump *16 Fuel Main Valve Assembly
        *17 Fuel Pressure Regulator Assembly *18 Fuel Filter
        *19 Fuel Pressure Sensor - -
        *a Low Pressure Fuel System *b High Pressure Fuel System