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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
Evaporative Emission (EVAP) Two Way
Valve
Testing
'97 model:
1.
Remove
the fuel fill cap.
2.
Remove
the vapor line
from
the EVAP two way
valve on the fuel tank, and connect
it
to aT-fitting
from
a vacuum
gauge
and
a vacuum pump as
shown.
VACUUM
PUMP/GAUGE,
0- 30 in.Hg
A973X
-
041 -
XXXXX
o
VACUUM/
PRESSURE GAUGE
07JAZ
-
0010008
T·FITTING
tf
T~NG
~
3.
Apply
vacuum
slowly and continuously while
watching
the
gauge.
The
vacuum
should
stabilize
momentarily at
0.7
- 2.0 kPa (5 -
15
mmHg,
0.2
-
0.6
in.Hgi.
If
the
vac
uum
stabilizes (valve opens)
bel ow
0
.7 kPa (5
mmHg, 0
.2
in.Hgl
or
above
2.0
kPa
(15 mmHg,
0.6
in.Hg), install
a
new
valve
and
retest.
4.
Move the
vacuum pump
hose
from
the vacuum
fit-
ting to the
pressure
fitting,
and move the vacuum
gauge hose from
the
vacuum side to
th
e pressu
re
side as shown.
5.
Slowly pressurize the vapor
line while watching
the
gauge.
The pressure
should stabilize at 1.3
-
4.7 kPa
(0
- 35
mmHg, 0.4 -
1.4
in.Hgl.
•
If the
pressure momentarily
sta
bilizes
(valve
opensl at 1.3 - 4.7 kPa (10 - 35 mmHg.
0.4 -
1.4
in.
Hg),
the
valve is OK.
•
If
the
pressure stabilizes below 1.3 kPa (10
mmHg,
0.4
in,Hgl
or above
4.7
kPa
(35
mmHg.
1.4 in.Hgl,
install a
new
valve and
retest.
11-224
'9S
- 00 models:
1.
Remove the
fuel fill
cap.
2.
Remove
the
vapor
line from the
EVAP two way
valve (located above
the EVAP
control canister),
and
connect it to a T-fitting from vacuum gauge and
vacu
um
pump as shown.
VACUUM/PRESSURE
GAUGE,
0-
4
in.Hg
07JAZ - 0010008
VACUUM PUMP/
GAUGE,
0 - 30
In.Hg
A973X -041-
~
iti
T·FITTING
3.
Apply vacuum slowly and continuously while
watching the gauge.
The
vacuum should stabilize
momentarily at
0.8
-
2.1
kPa
(6 -
16
mmHg,
0.2 - 0.6
in.Hgl.
If
the va cuum stabilizes (valve
ope
ns)
below
O.S kPa (6 mmHg, 0.2
in.Hgl
or above
2.1
kPa
(16
mmHg,
0.6
in.Hg),
install
a
new
valve and
retest.
4.
Move
the vacuum pump hose
from the
vacuum fit·
ting
to
the
pressure fitting, and
move
the vacuum
gauge
hose
from the vacuum side to the
pressure
side
as
shown
.
PRESSURE
SIDE
5.
Slowly
pressurize the
vapor
line
while watching the
gauge.
The pressure
should stabilize momentarily above
1.0 kPa {S
mmHg,
0.3 in.Hgl
.
•
If the
pressure
momentarily
stabilizes (valve
o pensl
above
1.0
kPa (8 mmHg. 0.3
in.Hgl.
the
valve
is OK.
•
If the pressure
stabilizes
below
1.0 kPa (S
mmHg,
0.3 in.Hg). install
a new valve and retest.
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