Evaporative Emission (Evap) Control Diagram - Honda Civic 2002-2003 Service Manual

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Evaporative Emission (EVAP) Control Diagram
The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.
• The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant
temperature is above 149°F (65°C).
• When 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 canister.
• During refueling, the fuel tank vapor control valve opens with the pressure in the fuel tank, and feeds the fuel vapor
to the EVAP canister.
FUEL TANK
VAPOR
FUEL TANK SIGNAL TUBE FTP
VAPOR
RECIRCULATION __ / SENSOR
VA~LVE
I t /
·-11
~
~
' 1 "'
EVAP
~I:l
,
=
--"1'
VALVE
!I'---
ill
.i !
Ii
___________ 'r!-
F' t:J----,
FUEL FILL CAP
FUEL TANK
VAPOR
RECIRCULATION
TUBE
FUEL TANK
VAPOR
CONTROL VALVE
,..------YEL/BLU
LTGRN----~
I , . . - - - - - P N K - - - {
LTGRN/REO
ECM
/'----: VARIOUS
"~SENSOR
YELl BLK
BLU
EVAP
1
CANISTER =
VENT SHUT
VALVE
From
r;==::±:=~-BLK/YEL ~No. 4 ACG
110 Allus.
EVAPTWOWAY
VALVE
EVAP CANISTER
PURGE VALVE
(conl'd)
11-37