GENERAL INFORMATION (EVAPORATIVE
EMISSION CONTROL SYSTEM) <Vehicles with catalytic
converter>
The evaporative
emission control system prevents fuel vapours generated in
the fuel tank from escaping into the atmosphere.
Fuel vapours from
the fuel tank flow through the fuel tank pressure control valve and
vapour pipe/hose to be stored temporarily in the canister.
When
driving the vehicle, fuel vapours stored in the canister flow through
the purge control
solenoid valve and purge port and go into the intake manifold to be sent
to the combustion chamber.
When the engine coolant temperature is low
or when the intake air quantity is small (when
the engine is at idle, for example), the engine control unit turns the
purge solenoid off to
shut off the fuel vapour flow to the intake manifold.
This does not
only insure the driveability when the engine is cold or running under
low
load but also stabilize the emission level.
SYSTEM DIAGRAM
<6G72>
<6G75>