Hyundai Elantra: 1. Crankcase emission control system - Emission control system - Maintenance - Hyundai Elantra HD 2006Ц2010 Owners ManualHyundai Elantra: 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.