2010 Hyundai Sonata Owner's Manual - Page 256

7 EMISSION CONTROL SYSTEMS 2 EMISSION CONTROL SYSTEMS H010A02NF-AAT H010B01A-AAT The emission control system of your vehicle is covered by a written limited warranty. Please see the warranty information contained in the Owner's Handbook & Warranty Information booklet in your vehicle. Your vehicle is equipped with an emission control system to meet all applicable emission regulations. There are three emission control systems, as follows. (1) Crankcase emission control system (2) Evaporative emission control system (3) Exhaust emission control system In order to assure the proper function of the emission control systems, it is recommended that you have your vehicle inspected and maintained by an authorized Hyundai dealer in accordance with the maintenance schedule in this manual. Caution for the Inspection and Maintenance Test With Electronic Stability Control (ESC) system o To prevent the vehicle from misfiring during dynamometer testing, turn the Electronic Stability Control (ESC) system off by pressing the ESC switch. o After dynamometer testing is completed, turn the ESC system back on by pressing the ESC switch again. 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 fresh filtered air to the crankcase through the air intake hose. Inside the crankcase, the fresh air mixes with blow-by gases, which then pass through the PCV valve into the induction system. H010C01S-AAT 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 surge tank through the purge control solenoid valve. 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 warms-up during ordinary driving, the PCSV opens to introduce evaporated fuel to the engine. 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.)