Evaporative Emission Control System; General Information; System Diagram; Component Location - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

17-10
ENGINE AND EMISSION CONTROL -

EVAPORATIVE EMISSION CONTROL SYSTEM

GENERAL INFORMATION

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 solenoid and
purge port and go into the intake manifold to be
sent to the combustion chamber.

SYSTEM DIAGRAM

Purge control
solenoid valve
(ON: Open)

COMPONENT LOCATION

Purge control solenoid valve
Vacuum tank
Canister
Check
valve
Control
relay
Battery
Alternator
Emission Control System
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.
Air flow sensor
Engine coolant
temperature sensor
Intake air
temperature sensor
Barometric pressure
sensor
Engine-ECU