Toyota Celica Supra 1986 Service And Repair Manual page 97

..
121
131
EMISSION CONTROl SYSTEMS - Exhaust Gas Recirculetion lEGAl System
EGR
Coo lor
EGR Port
Pressuft
Clvmbt•
EGR
Vtcuum
ModulatOt
EC·11
....
~
"""'
To reduce NO·x emission. p.n: of the exh.eu!.t gases • • recwcutated through the EGA Vltve to the inteke maniit<*i to
tower thl maximum comtxlstton
c~e1ure.
Cool ....
VSV
Ttvot ... V.tv.
Pftt.su.re
In tht EGA
EGA Vaouwn
EGR
hhlutt
a..
Ttmp. Ol)tlf'lllng Ano ..
v.ave ,,.,,..,.
Chlmber
M OduiMOt
V.tvt
8tlow
s?•c
OPEN
CLOSED
Nor
CI3&'FI
-
- -
rtc.irculet~
Pothlonld
betow
CLOSED
Nor
EGA""''
-
-
rtcncul••~
Polhton.d be·
Ill • Plll.lfJJI c.oft•
OPENS PHiage
CLOSED
Nor
Above
&3•c ClOSE
tWHn
EGA
pott
lOW atanlty alteJ·
to ttmOtDhrtre
ftc:ltctJa.ted
114S• Ft
end R
port
121
nat'"t between
ClOSES
-•ego
HIGH
low
end
high
to 11mo....,n.re
OPEN Rtcireullted
Po•itlontd tbove 131
..
CLOSE$
pasuoe
Rtehcul<~ttd
R pon
HIGH
to atmojphere
OPEN
(lntftastl
Remar·k t :
•Pfessure incretlt - Modult tor doses - EGA varve O()e(\S -
Preaaurr drops
EGA v.tve
d0511 -
Moduletor opens
• •when
the thto11Jo valve is positioned tbove the R
port.
the EGA vKuum moctulatcw
wil
close
the
etmosl)hefe P.IS1.191 and open
rho
EGR >Jitve 10 inetellt
the
EGA 91$. evan
if
the
exhaust pressure
it:
insufftciotntty
tow.