FUNCTION OF MAIN COMPONENTS
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. |
| Charcoal Canister Sub-assembly | 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 has been absorbed by the charcoal canister sub-assembly into the intake manifold. | |