EMISSION CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components of the exhaust emission control system are as follows:

      Components Quantity Function
      ECM 1

      • The ECM controls the fuel injection timing, fuel injection volume and Exhaust Gas Recirculation (EGR) gas flow volume to reduce the exhaust gas emissions in accordance with the signals from the air fuel ratio sensor.

      • Controls the air fuel ratio sensor heater.
      NOx Storage Reduction (NSR) Catalyst 1 Stores the NOx.
      Diesel Particulate Filter (DPF) Catalyst 1 Captures the Particulate Matter (PM).
      H2S Sweeper Catalytic Converter 1 Reduces the H2S in the exhaust gas.
      Air Fuel Ratio Sensor 2 Detects the oxygen concentration in the exhaust gas. For details, see the 1WW Engine Control section.

  2. SYSTEM CONTROL


    1. The ECM controls the air fuel ratio sensor heater according to the engine condition in order to promote the warm-up of the air fuel ratio sensor.

  3. FUNCTION


    1. Maintains the temperature of the air fuel ratio sensor at an appropriate level to increase detection accuracy of the oxygen concentration in the exhaust gas.