Emission Control Systems - Hyundai Accent 2001 Owner's Manual

7. 7. 7. 7. 7. EMISSION CON- EMISSION CON- EMISSION CON-
EMISSION CON- EMISSION CON-
TR TR TROL SYSTEMS OL SYSTEMS OL SYSTEMS OL SYSTEMS
TR TR OL SYSTEMS
H010A01A-AAT
EMISSION CONTROL SYSTEM EMISSION CONTROL SYSTEM EMISSION CONTROL SYSTEM
EMISSION CONTROL SYSTEM EMISSION CONTROL SYSTEM
Your Hyundai is equipped with an emission
control system to meet all requirements of the
U.S. Environmental Protection Agency or Cali-
fornia 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 main-
tained by an authorized Hyundai dealer in ac-
cordance with the maintenance schedule in this
manual.
H010B01A-AAT
1. 1. 1. 1. 1. CRANKCASE EMISSION CONTROL CRANKCASE EMISSION CONTROL CRANKCASE EMISSION CONTROL CRANKCASE EMISSION CONTROL CRANKCASE EMISSION CONTROL
SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM
The positive crankcase ventilation system is
employed to prevent air pollution caused by
blow-by gases being emitted from the crank-
case. This system supplies filtered fresh air to
the crankcase through the air intake hose.

EMISSION CONTROL SYSTEMS

EMISSION CONTROL SYSTEMS EMISSION CONTROL SYSTEMS EMISSION CONTROL SYSTEMS EMISSION CONTROL SYSTEMS
Inside the crankcase, the fresh air mixes with
blow-by gases, then passes through the PCV
valve into the induction system.
H010C01S-AAT
2. Evaporative Emission Control (In- 2. Evaporative Emission Control (In- 2. Evaporative Emission Control (In-
2. Evaporative Emission Control (In- 2. Evaporative Emission Control (In-
cluding ORVR: Onboard Refueling cluding ORVR: Onboard Refueling cluding ORVR: Onboard Refueling cluding ORVR: Onboard Refueling cluding ORVR: Onboard Refueling
Vapor Recovery) System Vapor Recovery) System Vapor Recovery) System Vapor Recovery) System 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 (The ORVR system is designed to allow the (The ORVR system is designed to allow the (The ORVR system is designed to allow the (The ORVR system is designed to allow the
vapors from the fuel tank to be loaded into vapors from the fuel tank to be loaded into vapors from the fuel tank to be loaded into vapors from the fuel tank to be loaded into vapors from the fuel tank to be loaded into
a canister while refueling at the gas station, a canister while refueling at the gas station, a canister while refueling at the gas station,
a canister while refueling at the gas station, a canister while refueling at the gas station,
preventing the escape of fuel vapors into preventing the escape of fuel vapors into
preventing the escape of fuel vapors into preventing the escape of fuel vapors into preventing the escape of fuel vapors into
the atmosphere.) the atmosphere.) the atmosphere.) the atmosphere.) the atmosphere.)
Canister Canister Canister
Canister 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 so-
lenoid valve.
Purge Control Solenoid Valve (PCSV) Purge Control Solenoid Valve (PCSV) Purge Control Solenoid Valve (PCSV) Purge Control Solenoid Valve (PCSV) 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.
H010D01A-AAT
3. 3. 3. 3. 3. EXHAUST EMISSION EXHAUST EMISSION EXHAUST EMISSION
EXHAUST EMISSION EXHAUST EMISSION
CONTROL SYSTEM CONTROL SYSTEM
CONTROL SYSTEM CONTROL SYSTEM 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 CATALYTIC CONVERTER
CATALYTIC CONVERTER CATALYTIC CONVERTER CATALYTIC CONVERTER
Catalytic Converter
All Hyundai vehicles are equipped with a mono-
lith type three-way catalytic converter to re-
duce 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 unburned gasoline into the exhaust may
cause the catalytic converter to overheat and
create a fire hazard. This risk may be reduced
by observing the following:
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