EMISSION CONTROL SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS


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

      Component Function
      Exhaust Emission System ECM Determines an optimal fuel injection volume based on the signals from various sensors.
      TWC Reduces CO, HC and NOx in the exhaust gas.
      Oxygen Sensor Detects the oxygen concentration in the exhaust emissions by measuring the electromotive force generated in the sensor itself. For details, see the 1GR-FE Engine Control.
      Air Fuel Ratio Sensor
      Evaporative Emission Control ECM Sends signals to the VSV (for EVAP) to control the purge flow.
      Canister Contains activated charcoal to absorb the fuel vapor created in the fuel tank.
      VSV (for EVAP) Opens in accordance with the signals from the ECM when the system is purging, in order to send the fuel vapor that was absorbed by the charcoal canister into the intake manifold.

  2. CONSTRUCTION


    1. Three-Way Catalyst (TWC)


      1. 4 TWCs have been provided in the exhaust manifold and exhaust pipe.

      2. This TWC improves exhaust emissions by optimizing the cell density and the wall thickness.

        A01J2QWE01
        Text in Illustration
        *1 TWC - -

  3. OPERATION


    1. Evaporative Emission Control System


      1. Based on the signals from various sensors, the ECM opens and closes the VSV (for EVAP). Thus, it controls the purge flow of evaporative emissions (HC) in the canister in accordance with the engine conditions.