2003 Hyundai Accent Owner's Manual - Page 167

7- 2 EMISSION CONTROL SYSTEMS H010C01S-AAT H010D01A-AAT H010A01A-AAT EMISSION CONTROL SYSTEM Your Hyundai is equipped with an emission control system to meet all requirements of the U.S. Environmental Protection Agency or California Air Resources Board. There are three emission control systems which are as follows. 1) Crankcase Emission Control System 2) Evaporative Emission Control System 3) Exhaust Emission Control System In order to ensure the proper function of the emission control systems, it is recommended that you have your car inspected and maintained by an authorized Hyundai dealer in accordance with the maintenance schedule in this manual. H010B01A-AAT 2. Evaporative Emission Control (Including ORVR: Onboard Refueling Vapor Recovery) System The Evaporative Emission Control System is designed to prevent fuel vapors from escaping into the atmosphere. (The ORVR system is designed to allow the vapors from the fuel tank to be loaded into a canister while refueling at the gas station, preventing the escape of fuel vapors into the atmosphere.) 3. EXHAUST EMISSION CONTROL SYSTEM The Exhaust Emission Control System is a highly effective system which controls exhaust emissions while maintaining good vehicle performace. H020A01A-AAT CATALYTIC CONVERTER Canister Fuel vapors generated inside the fuel tank are absorbed and stored in the onboard canister. When the engine is running, the fuel vapors absorbed in the canister are drawn into the induction system through the purge control solenoid valve. 1. CRANKCASE EMISSION CONTROL SYSTEM The positive crankcase ventilation system is employed to prevent air pollution caused by blow-by gases being emitted from the crankcase. This system supplies filtered fresh air to the crankcase through the air intake hose. Inside the crankcase, the fresh air mixes with blow-by gases, then passes through the PCV valve into the induction system. Purge Control Solenoid Valve (PCSV) The purge control solenoid valve is controlled by the Engine Control Module (ECM); when the engine coolant temperature is low during idling, the PCSV closes so that evaporated fuel is not taken into the engine. After the engine warmsup during ordinary driving, the PCSV opens to introduce evaporated fuel to the engine. Catalytic Converter HLC5022 All Hyundai vehicles are equipped with a monolith type three-way catalytic converter to reduce the carbon monoxide, hydrocarbons and nitrogen oxides contained in the exhaust gas. Exhaust gases passing through the catalytic converter cause it to operate at a very high temperature. The introduction of large amounts of