ACURA RL KA9 1996 Service Repair Manual

('00 - 0 1 models ) Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0451 : Th e Fue l Tan k Pressur e (FTP )
senso r circui t range/performanc e problem .
The MI L ha s bee n reporte d on .
DT C P045 1 is stored .
Chec k fo r th e fue l tan k pressur e
sensor:1. D o th e PC M Rese t Procedure .2. Remov e th e fue l fil l cap .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Monito r th e FT P Senso r volt -
ag e wit h th e Hond a PG M
Tester , o r measur e voltag e
betwee n PC M connecto r ter -
minal s D1 5 an d D22 .
I s ther e approx . 2. 5 V ?
YE S
Chec k fo r th e fue l tan k pressur esensor:1. Disconnec t th e hos e betwee nthe EVA P tw o wa y valv e an dthe FT P senso r a t th e EVA P tw oway valv e end .2. Connec t a vacuu m pum p t oth e ope n en d o f tha t hose .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Monito r th e FT P Senso r volt -
age wit h th e Hond a PG MTester , o r measur e voltag e
betwee n PC M connecto r ter -
minal s D1 5 an d D22 , an d care -
full y appl y vacuu m o n th e
hos e on e strok e a t a time .
5 . Th e voltag e shoul d smoothl y
dro p fro m th e startin g approx .
2. 5 V dow n t o approx . 1. 5 V .
STO P applyin g vacuu m whe n
the voltag e drop s t o approx .1.5 V or damag e t o th e FT P
senso r ma y occur .
Doe s th e voltag e dro p t o approx .
1. 5 V an d hold ?
YES
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e hos e a t fue l
tan k pressur e senso r an d fue l
tank .
PCM CONNECTO R D (22P )
Wir e sid e o f femal e terminal s
Chec k th e vacuu m line s fo r
restrictio n o r blockag e repai r a s
necessary . I f OK , replac e th e fue l
tan k pressur e sensor .
VACUUM
PUMP /
GAUGE ,0 - 3 0 in.H gA973 X -041 -xxxx x
EVAP TWO-WA YVALVE
Replac e th e fue l tan k pressur esensor.
NO
N O
ProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0452 : A lo w voltag e proble m in th e Fue l Tan k Pressur e
(FTP) sensor .
The fue l tan k pressur e senso r convert s fue l tan k absolut e pressur e int o electrica l signal s an d input s th e PCM .
OUTPU TVOLTAG E(V)
Th e MI L ha s bee n reporte d on .
DT C P045 2 is stored .
Chec k th e vacuu m lines :
Chec k th e vacuu m line s o f th e FT P
senso r fo r misrouting , leakage ,
breakag e an d clogging .
Ar e th e vacuu m line s OK ?
YES
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2. Remov e th e fue l fil l cap .3. Tur n th e ignitio n switc h O N (II) .
4 . Monito r th e FT P sensor volt-
age wit h th e Hond a PG MTester , o r measur e voltag ebetwee n bod y groun d an d
PC M connecto r termina l D15 .
I s ther e approx . 2. 5 V ?
NO
Chec k fo r a n ope n in wir e (VCC 2line):1. Tur n th e ignitio n switc h OFF .
2 . Reinstal l th e fue l fil l cap .
3 . Disconnec t th e FT P senso r 3 P
connector .
4. Tur n th e ignitio n switc h O N (II) .5. Measur e voltag e betwee n th e
FT P senso r 3 P connecto r ter -
minal s No . 1 an d No . 2 .
I s ther e approx . 5 V ?
YE S
Repai r o r replac e vacuu m line sas necessary .
Intermittent failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e wire s a t C41 7
(locate d nea r th e under-das h
fuse/rela y box) , C31 9 (C674) *
(fue l tan k pressur e sensor ) an d
PCM .
Repai r ope n in th e wir e betwee nthe fue l tan k pressur e senso r an d
th e PC M (D21) .
PRESSUR E
PCM CONNECTO R D (22P )
Wire sid e o f femal e terminal s
FUEL TAN KPRESSUR E SENSO R3P CONNECTO R (C31 9 (C674)» )
Wir e sid e o f femal e terminal s
* : '0 0 - 0 1 model s
(T o pag e 11-179 )
YES
NO
N O
ProCarManuals.com

(From pag e 11-178 )
Chec k fo r a shor t i n th e wir e
(PTAN K line) :
Measur e voltag e betwee n th e FT P
senso r 3 P connecto r terminal s
No. 2 an d No . 3 .
FUE L TAN KPRESSUR E SENSO R3P CONNECTO R (C31 9 (C674)* )
PTAN K
(GRN/YEL )
I s ther e abou t 5 V ? Replac
e th e fue l tan k pressur e
sensor.
NO
Chec k fo r a shor t i n th e wir e
{PTAN K line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PC M connec -tor D (22P) .3. Chec k fo r continuit y betwee n
th e FT P senso r connecto r No .
3 termina l an d bod y ground .
PTANK
(GRN/YEL )
Is ther e continuity ?
NO
Repai r shor t i n th e wir e betwee n
th e fue l tan k pressur e senso r an d
PC M (D15) .
Substitut e a known-goo d PC Mand rechec k (se e pag e 11-42 fo rimmobilize r information) . I f nor -mal FT P senso r i s indicated ,
replac e th e origina l PCM .
*: '0 0 - 0 1 model s
YES
Wir e sid e o f femal e terminal s
YES
ProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0453 : A hig h voltag e proble m in th e Fue l Tan k Pressur e
sensor.
The MI L ha s bee n reporte d on .
DT C P045 3 is stored .
Chec k th e vacuu m lines :
Chec k th e vacuu m line s o f th e
fuel tan k pressur e senso r fo r mis -routing , leakage , breakag e an dclogging .
Are th e vacuu m line s OK ?
YES
Proble m verification :1. D o th e PC M Rese t Procedure .2. Remov e th e fue l fil l cap .3. Tur n th e ignitio n switc h O N (II) .
4 . Monito r th e FT P sensor volt-
age wit h th e Hond a PG MTester , o r measur e voltag e
betwee n bod y groun d an d
PC M connecto r termina l D15 .
I s ther e abou t 2. 5 V ?
NO
Chec k fo r a n ope n i n th e wir e
(SG 2 line) :
1. Tur n th e ignitio n switc h OFF .2. Reinstal l th e fue l fil l cap .3. Disconnec t th e fue l tan k pres -
sur e senso r 3 P connector .
4 . Tur n th e ignitio n switc h O N (II) .
5 . Measur e voltag e betwee n th e
fue l tan k pressur e senso r 3 P
connecto r terminal s No . 1 an d
No. 2 .
Is ther e abou t 5 V ?
YE S
Chec k fo r a shor t i n th e wir e
(PTAN K line) :
Measur e voltag e betwee n th e
fue l tan k pressur e senso r 3 P con -
necto r terminal s No . 2 an d No . 3 .
(T o pag e 11-181 ) Repai
r o r replac e vacuu m line s
as necessary .
PCM CONNECTO R D (22P )
YES
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e wire s a t C41 7
(locate d nea r th e under-das h
fuse/rela y box) , C31 9 (C674) *
(fue l tan k pressur e sensor ) an d
PCM .
Wire sid e o f femal e terminal s
FUE L TAN K
PRESSUR E SENSO R
3 P CONNECTO R (C31 9 (C674)* )
Repai r ope n in th e wir e betwee n
th e fue l tan k pressur e senso r an d
PC M (D22) .
* : '0 0 - 0 1 model s
NO
Wir e sid e o f femal e terminal s
NO
ProCarManuals.com

(From pag e 11-180 )
I s ther e abou t 5 V ? Replac
e th e fue l tan k pressur e
sensor.
NO
Chec k fo r a n ope n i n th e wir e
(PTAN K line) :
Measur e voltag e betwee n PC M
connecto r terminal s D1 5 an d D22 . PC
M CONNECTO R D (22P )
I s ther e abou t 5 V ?
NO
Repai r ope n i n th e wir e betwee n
th e fue l tan k pressur e senso r an d
th e PC M (D15) .
Wire sid e o f femal e terminal s
Substitut e a known-goo d PC M
an d rechec k (se e pag e 11-42 fo r
immobilize r information) . I f nor -
ma l fue l tan k pressur e senso r i s
indicated , replac e the origina l
PCM.
YES
YES
ProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1456 : Evaporativ e Emissio n (EVAP ) contro l syste m lea k
detecte d (fue l tan k system) .
'96 - 9 9 models :
Troubleshootin g Flowchar t
The MI L ha s bee n reporte d on .
DT C P145 6 is stored .
Chec k th e fue l fil l cap :
Chec k the fue l fill cap (th e capmus t b e a Hond a ca p an d b e
tightene d a t leas t thre e "clicks "
t o properl y sea l th e system) .
Is th e prope r fue l fil l ca p installe dand properl y tightened ?
Fue l tan k pressur e senso r test .
Chec k th e fue l tan k pressur e sensor :1. Remov e th e fue l fil l cap .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Monito r th e FT P Senso r volt -
age wit h th e Hond a PG MTester , o r measur e voltag e
betwee n PC M connecto r ter -
minal s D1 5 an d D22 .
I s ther e abou t 2. 5 V ?
YE S
Chec k th e fue l tan k pressur e sen -sor1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e hos e betwee n
th e EVA P two-wa y valv e an d
th e fue l tan k pressur e senso r a t
th e EVA P two-wa y valv e end .
3 . Connec t a vacuu m pum p to th e
ope n en d o f tha t hose .
4. Tur n th e ignitio n switc h O N (II) .5. Monito r th e FT P Senso r volt -
ag e wit h th e Hond a PG M
Tester , o r measur e voltag e
betwee n PC M connecto r termi -
nal s D1 5 an d D22 , an d carefull y
pum p vacuu m on th e hos e on e
strok e a t a time .
6 . Th e voltag e shoul d smoothl y
dro p fro m approx . 2. 5 V dow n
t o approx . 1. 5 V . Sto p applyin g
vacuu m whe n th e voltag e
drop s t o approx . 1. 5 V or dam -
ag e t o th e fue l tan k pressur e
senso r ma y occur . Replac
e th e fue l fil l ca p (gra y col -
ore d cap .
NO
Fue l fil l ca p i s OK . D o th e fue l
tan k pressur e senso r test .
PCM CONNECTO R D (22P )
Replac e th e fue l tan k pressur e
sensor.
Wire sid e o f femal e terminal s
VACUU M
PUMP /
GAUGE ,0 - 3 0 in.H g
A973 X -
04 1 -XXXX X
EVAP TWO-WA YVALVE
(To pag e 11-183 )
NO
Replac e o r tighte n th e cap .
NO
YE S
YESChec k th e fue l fil l ca p seal :Chec k the fue l fill ca p seal .
Is th e fue l fill ca p sea l missin g ordamaged ?
ProCarManuals.com

(From pag e 11-180 )
Dos e th e voltag e dro p t o
approx . 1. 5 V an d hold ?
NO
Replac e th e fue l tan k pressur esensor.
EVAP purg e contro l solenoi d
valv e test .
Chec k th e EVA P purg e contro l
solenoid valve :1. Disconnec t th e vacuu m hos e
fro m th e EVA P purg e contro l
solenoi d valve , an d connec t a
hos e an d a vacuu m pum p t o
th e EVA P purg e contro l
solenoi d valve .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Appl y vacuu m to th e hose .
Dos e th e valv e hol d vacuum ?
NO
Chec k th e EVA P purg e contro lsolenoid valve :1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e EVA P purg e
contro l solenoi d valv e 2 P con -
nector .3. Chec k fo r continuit y betwee n
th e EVA P purg e contro l
solenoi d valv e 2 P connecto r
terminal No . 1 an d bod yground .
I s ther e continuity ?
YES
Chec k fo r a shor t i n th e wir e (PC S
line) :
1 . Disconnec t th e PC M connecto r
A (26P) .2. Chec k fo r continuit y betwee n
th e EVA P purg e contro l
solenoi d valv e 2 P connecto r
termina l No . 1 an d bod y
ground .
I s ther e continuity ?
NO
Substitut e a known-goo d PC Mand rechec k (se e pag e 11-42 fo rimmobilize r information) . I f
symptom/indicatio n goe s away ,
replac e th e origina l PCM . Fue
l tan k pressur e senso r i s OK .
D o th e EVA P purg e contro l
solenoi d valv e test .
EVA P purg e contro l solenoi d
valve i s OK . D o th e EVA P bypas ssolenoi d valv e tes t (se e pag e 11 -184) .
EVA P PURG E CONTRO L SOLENOI D
VALV E 2P CONNECTO R (C127 )
Replac e th e EVA P purg e contro l
solenoi d valve .
Repai r shor t i n th e wir e betwee n
PCM (A23 ) an d EVA P purg e con -trol solenoi d valve . Wir
e sid e o f
femal eterminal s
YES
YE S
NO
YE S
ProCarManuals.com

Emission Control System
Evaporative 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 two-wa y
valve , an d connec t a vacuu m
pum p t o th e hose .
2 . Connec t th e PC M connecto r
terminal F 1 t o th e bod ygroun d wit h 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 .
Dos e th e valv e hol d vacuum ?
I s ther e batter y voltage ?
EVAP TWO-WA YVALVE
VACUU MPUMP/GAUGE ,0 - 3 0 in.H g
A973 X -
041 -XXXX X
PCM CONNECTO R F (8P )
EVA PBYPAS SSOLENOI DVALVE
Wire sid e o f
femal e
terminal s
EVA P bypas s solenoi d valve /
EVA P two-wa y valv e i s OK. Do
th e EVA P contro l caniste r ven t
shu t valv e tes t (se e pag e 11-185 ).
EVAP BYPAS S SOLENOI D
VALV E 2P CONNECTO R (C320 )
NORepai r ope n i n th e wir e betwee n
th e EVA P bypas s solenoi d valv e
and PC M (F1) .
Replac e th e EVA P bypas s solenoi d
valv e an d O-rings .
O-RINGReplace .
Repair ope n i n th e wir e betwee n
th e EVA P bypas s solenoi d valv e
and No . 2 0 EC U (PCM ) (20 A) .
NO
YE S
Chec k fo r a n ope n in 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 bypas s solenoi d valv e
2 P connecto r termina l No . 1
an d bod y ground .
Is ther e continuity ?
YES
Wir e sid e o f
femal e
terminal s
YES
NO
Chec k fo r a n ope n i n the wir e
(2WB S line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EVA P bypas s
solenoi d valv e 2 P connector .
3 . Chec k fo r continuit y betwee n
th e EVA P bypas s solenoi d
valv e 2 P connecto r termina l
No. 2 an d bod y ground .
JUMPE RWIRE
ProCarManuals.com

EVAP contro l caniste r ven t shu t
valv e test .
Chec k th e EVA P contro l caniste r
ven t shu t valve :
1 . Disconnec t th e vacuu m hos e
fro m th e EVA P thre e wa y
valve , an d connec t a vacuu m
pum p t o th e hose .
2. Tur n th e ignitio n switc h O N (II) .3. Appl y vacuu m to th e hose .
Dos e th e valv e hol d vacuum ?
YES
Chec k th e EVA P contro l caniste r
ven t shu t valve :
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 contro l caniste r ven t
shu t valv e 2 P connecto r termi -
na l No . 2 an d bod y ground .
I s ther e continuity ?
YES
Chec k fo r a n shor t i n th e wir e
(VS V 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 contro l caniste r ven t
shu t valv e 2 P connecto r termi -
nal No . 2 an d bod y ground .
Is ther e continuity ?
NO
Substitut e a known-goo d PC M
an d rechec k (se e pag e 11-42 fo r
immobilize r information) . I f
symptom/indicatio n goe s away ,
replac e th e origina l PCM .
EVAPCONTRO LCANISTER
EVAP contro l caniste r ven t shu t
valv e is OK . D o th e vacuu m hose s
an d connection s tes t (se e pag e
11-186 ).
VACUU M
PUMP/GAUGE , 0 - 3 0 in.H g
A973 X - 04 1 - XXXX X
EVAPTHRE E WA YVALV E
EVAP CONTRO LCANISTER VEN T SHU T
VALV E 2P CONNECTO R (C316 )
Wir e sid e o f femal e terminal s
Replac e th e EVA P contro l caniste r
ven t shu t valv e an d O-ring .
Repai r shor t i n th e wir e betwee n
PC M (F5 ) an d EVA P contro l canis -
te r ven t shu t valve .
YES
NO
N
O
ProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
Are th e part s OK ?
Repair o r replac e th e parts .
YES
Substitut e a known-goo d PC M
an d rechec k (se e pag e 11-42 fo r
immobilize r information) . I f
symptom/indicatio n goe s away ,
replac e th e origina l PCM .
Vacuu
m hose s an d connection s
test .
Chec k th e vacuu m hose s an d con -
nections :Check followin g part s fo r leakag e
t o atmospher e (se e pag e 11-175 ):
Fue l tan k
Fue l
fill ca pFue l fil l pip e
EVA P two-wa y valv e
Fue l tan k pressur e senso r
NO
ProCarManuals.com