Evaporative Emission (Evap) Controls - Honda Prelude 1993 Service Manual

Emission Control SYstem
Evaporative Emission (EVAPI Controls
Description
The evaporative emission controts are designed to minimize the amount of fuel
vapor escaping to the atmosphere' The
system consists of the following components:
A. Evaporative Emission (EVAPI Control Caniatot
An EVAP control canister is used tor 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 Putgo Control System
E V A P c o n t r o | c a n i s t e r p u r g | n g i s a c c o m p | i s h e d b y d r a w i n g f r e s h a i r t h r o u g h t h e E V A P c o n t r o | c a n i s t e r a n d i n t o a
p o r t o n t h e t h r o t t | e b o d y . T h e p u r g i n g v a c u u m i s c o n t r o | | e d b y t h e E V A P p u r g e c o n t r o | d i a p h r a g m v a | v e a n d t h e
EVAP putge control solenoid valve
Fuel Tank Vapor Conttol 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 lhe EVAP control canister.
EVAP PURGE CONTROL SOLENOID VALVE OFF AFTER
STARTING ENGINE
ENGINE COOLANT TEMPERATURE ABOVE I67OF (75OC)
[ H 2 2 A 1 e n g i n e ( U S A : S i V T E C / C a n a d a : S R - V ) : 1 5 8 " F ( 7 O o C ) 1
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