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Exhau
Emission Co
1
System
I
M
ISSION CONTROL SYSTEM
SECOO2
1
When
temperature
of the
engine
coolant
is
low
Below
ISoC S90F
California
models
Below
600 1400F
Non
California modals
Below
SOOC
1220F
Canada models
Make
sure
that E G
R
control valve
does
not
operate
when
engine
speed
is
increased from idle
to 2
000
2 500
rpm
2
When
temperature
of the
engine
coolant
is
high
Above
ISoC S90F
California
models
Above
600C
1400F
Non
California models
Above
SOOC
1220F
Canada
models
1
Make
sure
that E G R
control
valve operates when
engine
speed
is
increased from idle
to 2
000
2
SOO
rpm
2
If EG R control valve does
not
operate
properly
check
it
as
follows
Disconnect
one
end KG
R
control
valve side
of
vacuum
h
which
connects
3 way
connecter
to
E G R control valve
Increase
engine
speed
from idle
to
2 000
2 SOO
rpm
Make
sure
that
thennal
vacuum
valve
is
closed
and that throttle
EC
14
vacuuin
is
present
at
the
end
E
GR
control
valve
side
of
vacuum
hose
Type
Al
Type
A2
Canada
Airregulatort
f
T V
V J
C035
If
vacuum
pressure is either weak
or
nonexistent
replace
thermal
vacuum
valve If
vacuum
Pse
ss
lJ
e
is
detected
replace
E G R valve
If
any
difficulty
is
encountered
in
judging
the condition
of any
com
ponent during
above
inspection
check
the
questionable
component
inde
pendently
as
follows
E G R corit ol valve
Dismount
E G
R
control
valve
from
engine
1
Apply
vacuum to
E G
R
control
valve
referring
to
the
following figure
If
the
valve
moves
to
full
position
it is
nonnal
E
G R
control
valve
will
remain
open for
more
than 30 seconds after
vacuum
has
cut
off
seC018
I
I
ucsl
2
Visually
check
E G R
control
valve for
damage
wrinkle
or
deforms
lion
Thermal
vacuum
valve
Dismount
thennal
vacuum
valve
from
engine
Before
dismounting
drain
engine
coolant
from
engine
Apply
vacuum
to
thennal
vacuum
valve and check
to
be
sure
that ther
mal
vacuum
valve opens
or
closes in
c
to
engine
coolant tempera
ture
as
specified
Thennal
vacuum
valve should open
or
close
at
a
temperature
specified
below
completing
the
vacuum
pa5Sage
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