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Evaporative Emission (EVAP) Controls
,J
a
DescriDtion
The evaporative emission controls are designed to minimize the amount of luel vapor escaping to the atmosphere. The
system consists of the following components:
A. EvaporativeEmission lEVAPlControlCanister
An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the
EVAP control canister into the engine and burned.
B. Vapol Purge Control System
EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a pon
on the intake manifold. The purging vacuum is controlled by the EVAP purge control solenoid valve.
C. Fuel Tank Vapor Control System
When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the varve opens ano
regulates the flow of fuel vapor to the EVAP control canister.
Frcm
No. 15
FUEL
TANK
PRESSURE
SENSOR
EVAP
THREE WAY
VALVE
EVAP CONTROL
CANISTEN
VENT SHUT VALVE
YEL/
-
BLK
EVAP
BYPASS
SOLENOID
VALVE
LT GRN
RED/
EVAP
TWO WAY
VALVE
FUEL TANK
EVAP VALVE
FUEL TANK
EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-
TROLLED AFTER STARTING ENGINE
?!l
----
311'AiS-*
(7.s Al
From
PGM.FI
MAIN RELAY
VARIOUS
SENSORS
----<
YEL
EVAP PURGE
CONTROL
SOLENOID VALVE
(cont'd)
-141
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