System

SYSTEM PURPOSE
The emission control systems are installed to reduce the amount of HC, CO and NOx exhausted from the engine ((3), (4) and (5)), to prevent the atmospheric release of blow-by gas-containing HC (1) and evaporated fuel containing HC being released from the fuel tank (2).
The function of each system is in the following.

System: Function:
(1) Positive Crankcase Ventilation (PCV) Reduces HC

(2) Evaporative Emission Control (EVAP) Reduces evaporated HC

(3) Exhaust Gas Recirculation (EGR) Reduces NOx

(4) Three-Way Catalytic Converter (TWC) Reduces HC, CO and NOx

(5) Multiport Fuel Injection* (MFI) Injects a precisely timed, optimum amount of fuel for reduced exhaust emissions.

NOTE: * For inspection and repair of the MFI system, refer to Fuel Delivery and Air Induction.