ACURA RL KA9 1996 Service Repair Manual

ABS Indicato r Ligh t Doe s No t G o Of f (N o DTC )
The AB S indicato r ligh t doe s no t g o of f afte r th e engine is starte d
Whe n n o proble m is foun d durin g th e initia l diagnosis , th e AB S contro l uni t turn s th e AB S indicato r ligh t driv e transisto r
of f t o tur n th e AB S indicato r ligh t off .
Possibl e cause s fo r a n AB S indicato r ligh t tha t doe s no t g o off , bu t n o Diagnosti c Troubl e Cod e (DTC ) i s indicated :
Blow n R/ C MIRRO R (7. 5 A ) fus e
Ope n circui t betwee n th e under-das h fuse/rela y bo x an d AB S contro l uni t
Ope n circui t betwee n th e batter y an d under-hoo d fuse/rela y bo x
Blow n AB S B 2 (1 5 A ) fus e
Ope n circui t insid e th e under-hoo d fuse/rela y bo x
Ope n circui t betwee n th e under-hoo d fuse/rela y bo x an d AB S contro l uni t
Fault y alternato r
Ope n circui t betwee n th e alternato r an d AB S contro l uni t
Shor t t o bod y groun d in th e WAR N circui t betwee n th e AB S indicator light an d AB S contro l uni t
Fault y AB S contro l uni t
Wit h engin e running , AB Sindicato r ligh t i s ON .With th e SC S servic e connec -
to r connecte d (se e pag e 19-40 ),
n o DT C is indicated .
Chec k th e chargin g system :
Star t th e engin e an d chec k th e
chargin g syste m indicato r light .
Does i t g o off ?
Chec k th e IG 2 powe r sourc e fuse :
1. Tur n th e ignitio n switc h OFF .2. Chec k th e R/ C MIRRO R (7. 5 A )
fus e i n th e under-das h fuse /
rela y box .
I s th e fus e OK ?
Chec k th e AB S B 2 (1 5 A ) fus e i n
th e under-hoo d fuse/rela y box .
I s th e fus e OK ?
(T o pag e 19-46 ) Chec
k th e chargin g syste m (se e
sectio n 4) .
Replac e th e fus e an d recheck . UNDER-HOO
D FUSE/RELA Y BO X
NOTE : Reinstal l th e fus e i f i t i s OK .
Replac e th e fus e an d recheck .
NOTE : Reinstal l th e fus e i f i t i s OK .
ABS B 2 (1 5 A ) FUS E
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Troubleshooting
ABS Indicato r Ligh t Doe s No t G o Of f (N o DTC ) (cont'd )
(From pag e 19-45 )
Chec k th e under-hoo d fuse /
relay box :Measur e th e voltag e betwee n th e
under-hoo d fuse/rela y bo x 9 P
connecto r termina l No . 1 an dbody ground .
Is ther e batter y voltage ?
Chec k fo r a n ope n in th e +B 2 cir -
cuit :
1 . Disconnec t th e AB S contro l
unit 22 P an d 26 P connectors .2. Measur e th e voltag e betwee nthe AB S contro l uni t 26 P con -necto r termina l No . 1 3 an dbody ground .
I s ther e batter y voltage ? UNDER-HOO
D FUSE/RELA Y BO X
9 P CONNECTO R
Replac e th e under-hoo d fuse /
rela y box .
Wire sid e o f femal e terminal s
AB S CONTRO L UNI T 26 P CONNECTO R
Repair ope n in th e wir e betwee nthe under-hoo d fuse/rela y bo x
an d AB S contro l unit .
NOTE : Chec k wit h th e AB S contro l uni tconnector s disconnected .
Does th e AB S indicato r ligh tcom e on ? Repai
r shor t t o bod y groun d i n
th e wir e betwee n th e AB S indi -
cato r ligh t an d AB S contro l unit .
(T o pag e 19-47 )
Wire sid e o f femal e terminal s
Check fo r a shor t t o bod y groun d
i n th e WAR N circuit :
Turn th e ignitio n switc h O N (II) .
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(From pag e 19-46 )
Chec k fo r a n ope n in th e IG 2 cir -
cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 22 P connecto r
termina l No . 1 1 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e CH G cir -
cuit :
1 . Star t th e engine .
2 . Measur e th e voltag e betwee n
the AB S contro l uni t 26 P con -necto r termina l No . 5 an d bod y
ground .
I s ther e batter y voltage ? Repai
r ope n i n th e wir e betwee n
th e R/ C MIRRO R (7. 5 A ) fus e i n
th e under-das h fuse/rela y bo x
an d AB S contro l unit . AB
S CONTRO L UNI T 22 P CONNECTO R
Wir e sid e o f femal e terminal s
ABS CONTRO L UNI T 26 P CONNECTO R
Repair ope n i n th e wir e betwee n
th e alternato r an d AB S contro l
unit.
Chec k fo r loos e AB S contro l uni t
connectors . I f necessary , substi -
tut e a known-goo d AB S contro l
uni t an d recheck .
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Troubleshooting
DTC 1: Pum p Moto r Over-ru n
NOTE: Th e AB S indicato r ligh t come s o n twice ; onc e fo r 2 second s durin g th e bul b check , the n again , indicatin g DT C 1 .
Th e AB S contro l uni t monitor s th e pum p moto r rela y driv e signa l durin g th e initia l diagnosi s an d individua l diagnosi s whe n
th e AB S is no t functioning . Whe n th e AB S contro l uni t detect s th e driv e signa l fo r 4 0 seconds , i t turn s th e pum p moto r
rela y of f an d turn s th e AB S indicato r ligh t on .
Possibl e causes :
Pressur e switc h stuc k OF F
Ope n circui t betwee n th e pressur e switc h an d AB S contro l uni t
Ope n circui t i n th e P-S W circui t betwee n th e pressur e switc h an d bod y ground , o r a poo r groun d
Dro p in pum p discharg e volum e
Leakin g outle t valv e
Leakin g relie f valv e
Brak e flui d leakag e in th e AB S operatio n syste m
Fault y AB S contro l uni t
Air trappe d in th e modulato r
With engin e running , AB S indi -cato r ligh t i s ON .With th e SC S servic e connec -tor connecte d (se e pag e19-40 ), DT C 1 is indicated .
Problem verification :Start th e engin e an d le t i t ru n fo r1 minute .
Does th e pum p moto r ru n fo r40 second s an d doe s th e AB Sindicato r ligh t com e on ?The vehicl e is O K at thi s time .
Is th e leve l OK ?
Inspec t th e modulato r reservoi rand th e accumulato r fo r brak efluid leakage , an d repai r a s nec -essary . I f th e reservoi r an d th eaccumulato r ar e OK , replac e th emodulato r unit .
(To pag e 19-49 )
Check th e reservoi r flui d level .
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(From pag e 19-48 )
Chec k fo r aerate d high-pressur e
brak e fluid :
Blee d th e high-pressur e brak e
flui d (se e pag e 19-98) .
Doe s th e AB S indicato r ligh t
g o of f afte r bleedin g th e brak e
fluid ?
Chec k th e modulato r unit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e modulato r uni t
14 P connector .
3 . Chec k fo r continuit y betwee n
terminal s No . 4 an d No . 11 .
I s ther e continuity ?
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e P-S W cir -
cuit :Measur e th e voltag e betwee n th e
AB S contro l uni t 26 P connecto r
termina l No . 1 9 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r loos e AB S contro l uni t
connectors . I f necessary , substi -
tut e a known-goo d AB S contro l
uni t an d recheck .
The AB S is O K now .
Replac e th e modulato r unit .
Pressur e switc h stuc k OF F
Dro p in pum p discharg e volum e
Leakin g outle t valv e
Leakin g relie f valv e
Repai r ope n in th e wir e betwee n
th e pressur e switc h an d bod y
ground .Termina l sid e o f mal e terminal s
AB S CONTRO L UNI T 26 P CONNECTO R
Repai r ope n i n th e wir e betwee n
th e pressur e switc h an d AB S con -
tro l unit .
Wire sid e o f femal e terminal s
Chec
k fo r a n ope n i n th e P-S W
GN D circuit :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e th e voltag e betwee n
the modulato r uni t 14 P con -necto r termina l No . 4 an d bod y
ground . MODULATO
R UNI T 14 P CONNECTO R
MODULATO
R UNI T 14 P CONNECTO R
Wir e sid e o f femal e terminal s
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Troubleshooting
DTC 1-2 : Pum p Moto r
The AB S contro l uni t check s th e condition s a t th e pum p moto r rela y driv e (PMR ) termina l an d moto r chec k (MCK ) termina l
during th e initia l diagnosi s an d regula r diagnosis . Whe n th e AB S contro l uni t detect s th e followin g condition s durin g th e
diagnosis , i t keep s th e AB S indicato r ligh t on . Whe n th e followin g condition s ar e detecte d afte r th e AB S indicato r ligh t
goe s off , th e AB S contro l uni t turn s th e AB S indicato r ligh t o n again .
Batter y voltag e a t th e MC K termina l wit h a n OF F signa l a t th e PM R termina l
O V at th e MC K termina l wit h a n O N signa l a t th e PM R termina l
Possible causes :
Open circui t o r shor t t o bod y groun d betwee n th e R/ C MIRRO R (7. 5 A ) fus e an d under-hoo d fuse/rela y bo x
Ope n circui t o r shor t t o bod y groun d in th e PM R circui t insid e th e under-hoo d fuse/rela y bo x
Fault y pum p moto r rela y
Open circui t o r shor t t o bod y groun d in th e PM R circui t betwee n th e under-hoo d fuse/rela y bo x an d AB S contro l uni t
Ope n circui t betwee n th e batter y an d under-hoo d fuse/rela y bo x
Blow n AB S MOTO R (4 0 A ) fus e
Blow n AB S UNI T (7. 5 A ) fus e
Ope n circui t o r shor t t o bod y groun d in th e moto r driv e circui t an d MC K circui t insid e th e under-hoo d fuse/rela y bo x
Ope n circui t o r shor t t o bod y groun d in th e MC K circui t betwee n th e under-hoo d fuse/rela y bo x an d AB S contro l uni t
Ope n circui t o r shor t t o bod y groun d betwee n th e under-hoo d fuse/rela y bo x an d pum p moto r
Fault y pum p moto r
Open circui t betwee n th e pum p moto r an d bod y groun d o r poo r groun d
Faulty AB S contro l uni t
With engin e running , AB S indi -cato r ligh t i s ON .With th e SC S servic e connec -tor connecte d (se e pag e19-40 ), DT C 1- 2 is indicated .
UNDER-HOO D FUSE/RELA Y BO X
ABS PUM P MOTO R RELA Y
ABS UNI T (7. 5 A ) FUS E
Chec k th e AB S MOTO R (4 0 A ) fus ein th e under-hoo d fuse/rela y box .
Is th e fus e OK ?Replac e th e fus e an d recheck .
NOTE: Reinstal l th e fus e if i t i s OK .
ABS MOTO R (4 0 A ) FUS E
Is th e fus e OK ?Replac e th e fus e an d recheck .
YES
NOTE : Reinstal lthe fus e if i t i s OK .
NOTE : Reliev e syste m pressur e fro m th emodulato r uni t blee d screw , the n star t th eengin e an d rechec k th e fuse . I f th e fus e i sblown , chec k fo r a shor t t o bod y groun d inth e MC K circuit .(To pag e 19-51 )
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(From pag e 19-50 )
Remov e th e AB S pum p moto rrelay an d chec k it (se e sectio n 23 ).
I s th e rela y OK ?
Chec k th e AB S pum p moto r oper -
ation :
1 . Reliev e syste m pressur e (se e
pag e 19-97) .
2 . Connec t th e AB S pum p rela y
connecto r + B an d MOTO R ter -
minal s wit h a jumpe r wire for1 second .
Doe s th e pum p moto r run ?
Chec k th e MC K (moto r check ) cir -
cuit :
1 . Remov e th e jumpe r wire .
2. Disconnec t th e under-hoo dfuse/relay bo x 3 P connector .3. Tur n th e ignitio n switc h O N (II) .4. Measur e th e voltag e betwee nthe AB S pum p moto r rela yconnecto r moto r termina l an dbody ground .
Is ther e abou t 10V ?
(T o pag e 19-52 ) Replac
e th e AB S pum p moto r
relay .
NOTE : I f th e rela y i s stuc k ON , th e moto r ma y
b e damaged . Chec k th e pum p moto r opera -
tion.
UNDER-HOO D FUSE/RELA Y BO X
JUMPE R WIR E
NOTE : Us e a jumpe r wir e wit h a diamete r
large r tha n 2 m m (0.0 8 in) .
(T o pag e 19-53 )
T o chec k fo r a n ope n i n th e pum p
motor driv e circui t
ABS PUM P MOTO R RELA Y CONNECTO R
(T o pag e 19-54 )
T o chec k fo r a n ope n in th e MC K
circui t MOTO
R TERMINA L
AB S PUM P MOTO R RELA Y CONNECTO R
+
B TERMINA L
MOTO
R TERMINA L
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Troubleshooting
DTC 1-2 : Pum p Moto r (cont'd )
(From pag e 19-51 )
Chec k fo r a n ope n in th e IG 2 cir -
cuit :
Measur e th e voltag e betwee n th e
under-hoo d fuse/rela y bo x 5 P
connecto r termina l No . 2 an dbody ground .
Is ther e batter y voltage ?
Chec k th e AB S pum p moto r rela y
operation :
1 . Connec t th e under-hoo d fuse /
rela y bo x 3 P connector.
2 . Instal l th e AB S pum p moto r
relay .
Doe s th e AB S pum p moto r
rela y operate ?
Chec k fo r a n ope n i n th e under -
hoo d fuse/rela y box :
Measur e th e voltag e betwee n th e
under-hoo d fuse/rela y bo x 5 P
connecto r termina l No . 1 an d
bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e PM R cir -
cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 22 P connecto r
termina l No . 2 1 an d bod y ground .
I s ther e batter y voltage ?
Reconnec t th e connector s prop -
erly , reliev e syste m pressur e an d
star t th e engine . I f DT C 1- 2 i s
store d again , replac e th e AB S
contro l unit . NOTE
: Th e AB S pum p moto r rela y coi l circui t
i s checke d beginnin g wit h thi s step .
UNDER-HOO D FUSE/RELA Y BO X5P CONNECTO R
Repair ope n in th e wir e betwee n
th e R/ C MIRRO R (7. 5 A ) fus e in th e
under-das h fuse/rela y bo x an d th e
under-hoo d fuse/rela y box . Wir
e sid e o f femal e terminal s
(T o pag e 19-55 )
T o chec k fo r a shor t t o bod y groun d
i n th e AB S pum p moto r rela y coi l cir -
cuit
NOTE : Th e AB S pum p moto r rela y coi l circui t
i s checke d fo r a n ope n beginnin g wit h thi s
step .
UNDER-HOO D FUSE/RELA Y BO X
5 P CONNECTO R
Replace th e under-hoo d fuse /
rela y box .
(Ope n circui t insid e th e box ) Wir
e sid e o f femal e terminal s
AB S CONTRO L UNI T 22 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e under-hoo d fuse/rela y bo x
an d AB S contro l unit .
NOTE : Ad d brak e flui d i f th e flui d leve l i s
lowe r tha n th e MI N line . Wir
e sid e o f femal e terminal s
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(From pag e 19-51 )
Chec k fo r a n ope n i n th e under -
hoo d fuse/rela y box :
1 . Connec t th e AB S pum p moto r
rela y connecto r + B an d MOTO R
terminal s wit h a jumpe r wire .2. Measur e th e voltag e betwee n
th e under-hoo d fuse/rela y bo x
3 P connecto r termina l No . 1
an d bod y ground . NOTE
: Th e AB S pum p moto r driv e circui t i s
checke d beginnin g wit h thi s step . UNDER-HOO
D FUSE/RELA Y BO X
3 P CONNECTO R
I s ther e batter y voltage ? Replac
e th e unde r hoo d fuse /
rela y box .
Wire sid e o f femal e terminal s
AB S PUM P MOTO R 2 P CONNECTO R
I s ther e batter y voltage ?
Repair ope n in th e wir e betwee nthe under-hoo d fuse/rela y bo x
an d AB S pum p motor .
Wire sid e o f femal e terminal s
Chec k fo r a n ope n in th e MOTO R
GN D circuit :
Measur e th e voltag e betwee n th e
AB S pum p moto r 2 P connecto r
terminal s No . 1 an d No . 2 .
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e AB S pum p moto r an d bod y
ground .Repair poo r groun d (G251 )
Replac e th e AB S pum p motor .
Chec
k fo r a n ope n in th e MOTO R
+ B circuit :
1. Disconnec t th e AB S pum pmotor 2 P connector .
2 . Measur e th e voltag e betwee n
th e termina l No . 1 an d bod y
ground .
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Troubleshooting
DTC 1-2 : Pum p Moto r (cont'd )
(From pag e 19-51 )
NOTE: Th e MC K (moto r check ) circui t i s
checke d beginnin g wit h thi s step .
UNDER-HOO D FUSE/RELA Y BO X7P CONNECTO R
Replace th e under-hoo d fuse /
rela y box .
(Ope n circui t insid e th e box ) Wir
e sid e o f femal e terminal s
Chec k fo r a n ope n in th e MC K cir -
cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 26 P connecto r
termina l No . 1 7 an d bod y ground . AB
S CONTRO L UNI T 26 P CONNECTO R
I s ther e abou t 10V ? Repai
r ope n in th e wir e betwee n
th e under-hoo d fuse/rela y bo x
an d AB S contro l unit .
Wire sid e o f femal e terminal s
Chec k fo r loos e AB S contro l uni t
connectors . I f necessary , substi -
tut e a known-goo d AB S contro l
uni t an d recheck .
Chec
k fo r a n ope n in th e under -
hoo d fuse/rela y box :
1 . Disconnec t th e under-hoo d
fuse/rela y bo x 7 P connector .
2 . Measur e th e voltag e betwee n
termina l No . 3 an d bod yground .
I s ther e abou t 1 0 V ?
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