EMISSION CONTROL SYSTEM


  1. OUTLINE


    1. Exhaust Emission Control System


      1. Three-Way Catalytic converters (TWCs) are used in order to reduce exhaust emissions.

      2. The ECM performs air fuel ratio feedback control based on signals from the air fuel ratio sensor and the oxygen sensor, and controls the fuel injection amount so that the air fuel ratio comes close to the stoichiometric air fuel ratio, at which the highest purifying efficiency of CO, HC and NOx is obtained.

      3. Air fuel ratio sensor and oxygen sensor heater control, which maintains the temperature of the respective sensors at an appropriate level, is used to improve the detection accuracy of oxygen concentration in the exhaust gas.

    2. Evaporative Emission Control System


      1. Destination Package for South Korea


        1. The evaporative emission control system prevents the fuel vapor that is created in the fuel tank assembly from being released directly into the atmosphere.

        2. The canister stores the fuel vapor that has been created in the fuel tank assembly.

        3. This system consists of a purge VSV, canister, canister pump module and ECM.

        4. The ECM controls the purge VSV in accordance with the driving conditions in order to direct the fuel vapor into the engine, where it is burned.

        5. In this system, the ECM checks for evaporative emission leaks and stores Diagnostic Trouble Codes (DTCs) in the event of a malfunction. An evaporative emission leak check consists of an application of vacuum to the evaporative emission system, which the ECM monitors the system for changes in pressure in order to detect a leak.

        6. The Onboard Refueling Vapor Recovery (ORVR) system is used.

        7. The canister pressure sensor is included in the canister pump module.

        8. A canister filter is provided on the fresh air line. This canister filter is maintenance-free.

      2. Except Destination Package for South Korea


        1. The evaporative emission control system prevents the fuel vapor that is created in the fuel tank assembly from being released directly into the atmosphere.

        2. The canister stores the fuel vapor that has been created in the fuel tank assembly.

        3. This system consists of a purge VSV, canister and ECM.

        4. The ECM controls the purge VSV in accordance with the driving conditions in order to direct the fuel vapor into the engine, where it is burned.