EMISSION CONTROL SYSTEM
7-1
SH010A1-E
EMISSION CONTROL SYSTEMS
(Not all models)
Depending upon the market for which the vehicle
is destined, the emission control system will
comprise one or more of the following emission
control devices.
(1) Crankcase emission control system
(2) Evaporative emission control system
(3) Exhaust emission control system
In order that the proper functioning of the emis-
sion control systems may be ensured, it is
recommended that the vehicle is inspected and
maintained by an authorized Hyundai dealer in
accordance with the maintenance schedule in
this manual.
SH000A1-E
7. EMISSION
CONTROL SYSTEM
SH010B1-E
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
by introducing fresh air to the crankcase through
the air cleaner where this mixes with blow-by
gases and then passes through the PCV valve
into the intake manifold from where it subse-
quently enters the combustion chamber and is
burned.
SH010D1-E
3. EXHAUST EMISSION CONTROL
SYSTEM
The exhaust emission control system is a highly
effective system which controls exhaust emis-
sion while maintaining good vehicle performance.
SH010C1-E
2. EVAPORATIVE EMISSION
CONTROL SYSTEM
The Evaporative Emission Control System is
designed to prevent fuel vapours from escaping
into the atmosphere through the fuel tank venti-
lation system.
Whilst the engine is not running, fuel vapours
generated inside the fuel tank are absorbed and
stored in a charcoal canister. When the engine is
started, the vapours stored in the canister are
drawn into the induction system through the
purge control solenoid valve and are subse-
quently burned.
The purge control solenoid valve is controlled by
the ECU; when the engine coolant temperature
is low or the engine is idling, the purge control
valve is closed and fuel vapours remain stored in
the canister. Under normal running conditions
when the engine is warm, the valve opens and
the vapours are drawn into the inlet tract and
subsequently burned in the combustion cham-
ber.
SH020A1-E
CATALYTIC CONVERTOR OPERATING
PRECAUTIONS
Hyundai Coupe models are fitted with catalytic
convertors which require special operating con-
siderations. The catalytic convertor serves to
oxidize certain noxious elements of the exhaust
gases leaving the engine to reduce the level of
pollutants emitted from the vehicle and, provided
that care is exercised to prevent damage, the
catalyst will operate efficiently for the life of the
vehicle.
It is of the utmost importance that the following
information is read and understood by the ve-
7
Catalytic
Converter
SSA7020A
