1996 ACURA RL KA9 Service Repair Manual

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
EVAP bypas s solenoi d valv e test .
Chec k th e EVA P bypas s solenoi d
valve :
1 . Disconnec t th e vacuu m hos e
fro m th e EVA P tw o wa y valve ,
and connec t a vacuu m pum pto th e hose .2. Tur n th e ignitio n switc h O N (II) .3. Appl y vacuu m to th e hose .
Dose th e valv e hol d vacuum ?
NO
Chec k th e EVA P bypas s solenoi d
valve :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EVA P bypas ssolenoid valv e 2 P connector .3. Chec k fo r continuit y betwee n
th e EVA P bypas s solenoi d
valve 2 P connecto r termina lNo. 2 an d bod y ground .
Is ther e continuity ?
YES
Chec k fo r a shor t i n th e wir e(2WB S line) :
1 . Disconnec t th e PC M connec -
tor F (8P) .2. Chec k fo r continuit y betwee n
th e EVA P bypas s solenoi d
valve 2 P connecto r termina lNo. 2 an d bod y ground .
Is ther e continuity ?
NO
Substitut e a known-goo d PC Mand recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
EVAP TWO-WA YVALVE
VACUU MPUMP/GAUGE ,
0 - 3 0 in.H g
A973 X -
04 1 -XXXX X
EVA P bypas s solenoi d valve/EVA P
two-wa y valv e is OK . D o th e EVA P
caniste r ven t shu t valv e tes t (se e
pag e 11-99 ).EVA PBYPAS SSOLENOI DVALVE
Replac e th e EVA P bypas s solenoi d
valv e an d O-rings .
Repai r shor t i n th e wir e betwee n
PC M (F1 ) an d EVA P bypas s
solenoi d valve .
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Does th e valv e hol d vacuum ?
I s ther e batter y voltage ?
NO
Repai r ope n i n th e wir e betwee n
th e EVA P caniste r ven t shu t
valve an d No . 2 0 EC U (PCM ) (2 0A)fuse .
VACUUM
PUMP/GAUGE , 0-3 0 in.H g
A973 X - 04 1 - XXXX X
EVA P caniste r ven t shu t valv e is
OK . D o th e caniste r syste m lea k
tes t (se e pag e 11-100 ).
N ORepai r ope n i n th e wir e betwee n
th e EVA P caniste r ven t shu t
valve an d PC M (F5) .
Replac e th e EVA P caniste r ven t
shu t valv e an d O-ring .
EVA
P caniste r ven t shu t valv e
test .
Chec k th e EVA P caniste r ven t
shu t valve :
1 . Disconnec t th e vacuu m hos e
an d connec t a vacuu m pum p
t o th e hose .
2 . Connec t th e PC M connecto r
termina l F 5 t o th e bod y groun d
with a jumpe r wire .3. Tur n th e ignitio n switc h O N (II) .4. Appl y vacuu m to th e hose .
I s ther e continuity ?
Chec k fo r a n ope n i n th e wir e
(IG 1 line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n th e
EVA P caniste r ven t shu t valv e
2 P connecto r termina l No . 1
an d bod y ground .
Chec
k fo r a n ope n i n th e wir e
(VS V line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EVA P caniste r
ven t shu t valv e 2 P connector .
3 . Chec k fo r continuit y betwee n
th e EVA P caniste r ven t shu t
valv e 2 P connecto r termina l
No . 2 an d bod y ground .
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Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
Canister syste m lea k test .
Chec k th e EVA P caniste r ven t
shu t valv e lin e an d connections :
1 . Tur n th e ignitio n switc h OFF .
2 . Connec t t o three-wa y te e fit -
ting s int o th e hos e fro m th e
EVA P caniste r t o th e EVA P tw oway valve . Connec t th e fue l
tan k pressur e senso r t o on e o f
th e te e fitting s an d th e vacuu m
pum p to th e other .
3 . Remov e th e ven t hos e fro m
th e EVA P caniste r ven t shu t
valv e an d ca p th e por t t o sea l
th e fres h ai r ven t fo r th e EVA P
canister .4. Tur n th e ignitio n switc h O N (II) .
5 . Whil e monitorin g th e FT P
Senso r voltag e wit h th e HD S o r
th e sca n tool , o r measurin g volt -
ag e betwee n PC M connecto r ter -
minal s D1 5 an d D2 2 slowl y
pum p th e vacuu m pum p usin g a
strok e ever y 1- 2 seconds .
6 . Continu e t o pum p vacuu m
until tha t voltag e drop s t oabou t 1.5V .
NOTE : Mak e sur e tha t th e
engin e coolan t temperatur e
stil l abov e 95° F (35°C ) an d you r
vacuu m pum p ha s n o leak .
7 . Monito r tha t voltag e fo r 2 0
seconds .
Doe s th e voltag e dro p to 1. 5 V
an d hold s a t leas t 2 0 seconds ?
NO
Chec k th e EVA P contro l Fue l tan k
vapo r ven t lin e an d connections :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e Fue l tan k vapo r
ven t tub e fro m th e EVA P can -
iste r an d plu g th e port .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Whil e monitorin g th e FT P
Senso r voltag e wit h th e HD S o r
th e sca n tool , o r measurin g volt -
ag e betwee n PC M connecto r ter -
minal s D1 5 an d D2 2 slowl y
pum p th e vacuu m pum p usin g a
strok e ever y 1 - 2 seconds .
5 . Continu e t o pum p vacuu m
until tha t voltag e drop s t oabou t 1.5V .
NOTE : Mak e sur e tha t th e
engin e coolan t temperatur e
stil l abov e 95° F (35°C ) an d you r
vacuu m pum p ha s n o leak .
6 . Monito r tha t voltag e fo r 2 0
seconds .
CAP
EVA PCANISTE R
EVAPCANISTE RVENTSHU TVALV E
VACUU M PUMP/GAUGE ,
0 - 3 0 In.H g
A973 X - 04 1 - XXXX X
TEEFITTING S
EVAP TW OWAYVALV E
Inspec t th e EVA P caniste r ven t
shu t valv e lin e an d connections .
FUEL TANK VAPOR
VENT TUBE
CA P
(To page 11-101)
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