Honda Civic Service Manual page 537

1
\
Evaporative Emission (EVAPI Controls
Description
The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The
system consists of the foliowing components:
A. Evaporative Emission (EVAP) Control Canisto]
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. Vapor Purge Control System
EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a port
on the intake manifold. The purging vacuum is controlled by the EVAP purge control solenoid valve.
I ' 9 6 D 1 6 Y 5 e n g i n e , ' 9 6 D l 6 Y 7 e n g i n e , ' 9 6 D 1 6 Y 8
e n g i n e ( s e d a n ) , ' 9 7 D 1 6 Y 5 e n g i n e , ' 9 7 D 1 6 Y 7
e n g i n e ( c o u p e r K A , K C m o d e l s , s e d a n : K A , K c '
K L i D X ) m o d e l s , h a t c h b a c k : a l l m o d e l s ) ,
' 9 7
D 16Y8 engine (sedan: KA, KC models)l
I ' 9 6 D 1 6 Y 8 e n g i n e ( c o u p e ) , ' 9 7 D 1 6 Y 7 e n g i n e
( c o u p e : K L m o d e l , s e d a n : K L ( L X ) m o d e l ) " 9 7
D16Y8 engine (coupe: all models, sedan: KL model)
'98-all models,'99-all models,'00-all modelsl
I
c.
D.
o r
l'lc COMPRESSOR CLUTCH ON
a n d
INTAKE AIR TEMPERATURE ABOVE 160"F (41'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 valve opens and
regulates the flow of fuel vapor to the EVAP control canister.
Onboard Refueling Vapor Recovery (ORVRI System {'99 - 00 models}
During refueling. the oRVR {onboard Refueling Vapor Recovery) vent shut valve opens with the pressure in the fuel
tank. and feeds the fuel vapor to the EVAP control canister.
t
(cont'd)
11-267
EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-
TROLLED AFTER STARTING ENGINE
ENGINE COOLANT TEMPERATURE
ABOVE 154'F {68"C)
INTAKE AIR TEMPERATURE ABOVE 32'F (O'C)
a n d
VEHICLE SPEED ABOVE O MILE (O KM/h}
ENGINE COOLANT TEMPERATURE ABOVE 154'F (68'C)