ACURA RL KA9 1996 Service Repair Manual

(From pag e 19-84 )
FRON T FAIL-SAF E RELA Y CONNECTO R
Check fo r a n ope n in th e FS R cir -
cuit :
1 . Connec t th e fron t fail-saf e
rela y termina l No . 4 to bod y
groun d wit h a jumpe r wire .2. Chec k fo r continuit y betwee n
th e AB S control unit 22 P con -
necto r termina l No . 1 an d
bod y ground .
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e AB S contro l uni t an d fron t
fail-saf e relay .
Wire sid e o f femal e terminal s
Chec k fo r a n ope n i n the GND
circuit :
Chec k fo r continuit y betwee n th e
fron t fail-saf e rela y connecto r ter -mina l No . 3 an d bod y ground .
FRONT FAIL-SAF E RELA Y CONNECTO R
Is ther e continuity ? Repai
r ope n in th e wir e betwee n
th e fron t fail-saf e rela y an d bod y
ground , o r poo r ground .
Terminal 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 . AB
S CONTRO L UNI T 22 P CONNECTO R
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Troubleshooting
DTC 7-4 : Rea r Solenoi d
During th e initia l diagnosis , afte r th e fail-saf e relay s ar e turne d on , an d durin g th e regula r diagnosis , th e AB S contro l uni t
monitor s th e voltag e fro m th e batter y fo r th e si x solenoid s (whe n th e AB S is no t functioning) . I f th e detectio n circui t fo r
the rea r solenoid s detect s 0 V , th e AB S contro l uni t keep s th e AB S indicato r ligh t o n afte r th e engin e is started . I t turn s th e
AB S indicato r ligh t o n agai n if i t detect s 0 V afte r th e ligh t goe s off .
Possibl e causes :
Rear fail-saf e rela y stuc k OF F
Ope n circui t i n th e rea r solenoi d driv e circuit s betwee n th e under-hoo d fuse/rela y bo x an d AB S contro l uni t
Shor t circui t t o bod y groun d in th e rea r solenoi d driv e circuit s betwee n th e solenoid s an d AB S contro l uni t
Fault y rea r solenoi d driv e transisto r (ON ) i n th e AB S contro l uni t
The AB S contro l uni t momentaril y output s th e O N signa l t o eac h solenoi d (to o momentar y to tur n th e solenoi d on ) durin g
the initia l diagnosis , an d eac h tim e th e vehicl e is driven , t o chec k th e voltag e fro m th e batter y wit h th e detectio n circuit . I f
th e detectio n circui t fo r th e rea r solenoid s detect s batter y voltag e a t thi s time , th e AB S contro l uni t keep s th e AB S indica -
to r ligh t on . I t turn s th e AB S indicato r ligh t o n agai n if i t detect s th e batter y voltag e whe n th e vehicl e i s driven .
Possibl e causes :
Short circui t t o powe r i n th e rea r solenoi d driv e circuit s betwee n th e solenoid s an d AB S contro l uni t
Fault y rea r solenoi d driv e transisto r (OFF ) i n th e AB S contro l uni t
Shor t circui t t o powe r i n th e rea r solenoi d driv e circuit s in th e modulato r wir e harnes s o r solenoid s
Shor t circui t t o th e rea r solenoi d outle t circui t i n th e inle t circui t betwee n th e solenoid s an d AB S contro l uni t
Shor t circui t t o th e right-fron t o r left-fron t solenoi d inle t o r outle t circui t i n th e rea r solenoi d inle t o r outle t circui t
betwee n th e solenoid s an d AB S contro l uni t
Doe s th e AB S indicato r ligh t g ooff ?
Th e syste m is O K a t thi s time .Check th e wir e harnes s an d con -nector s betwee n th e AB S contro lunit, fail-saf e rela y an d modulato runit (intermitten t ope n o r shor tcircuit) .
Is cod e 7- 4 indicated ?Perform th e appropriat e trouble -shooting fo r th e code .
(To pag e 19-87 )
Confir m th e DT C tha t appear s first .
Proble m verification :Start th e engine .
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 7- 4 is indicated .
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(From pag e 19-86 )
Chec k fo r a n ope n i n th e B 2 cir -
cuit :
1 . Remov e th e rea r fail-saf e relay .
2 . Measur e th e voltag e betwee n
termina l No . 2 an d bod yground .
REAR FAIL-SAF E RELA Y CONNECTO R
I s ther e batter y voltage ? Repai
r ope n i n th e wir e betwee n
th e under-hoo d fuse/rela y bo x
an d rea r fail-saf e relay . Termina
l sid e o f femal e terminal s
Chec k th e rea r fail-saf e rela y (se e
sectio n 23 ).
I s th e rela y OK ?
Replace th e rea r fail-saf e relay .
Chec k fo r a n ope n i n th e SOLE -
NOI D circuit :
1 . Connec t th e rea r fail-saf e rela y
connecto r terminal s No . 1 an d
No . 2 usin g a jumpe r wire .
2 . Disconnec t th e modulato r
unit 14 P connector .3. Measur e th e voltag e betwee n
bod y groun d an d terminal s
No. 6 an d No . 9 individually .
SOLENOID (BLU/BLK )
JUMPER WIR E
MODULATO R UNI T 14 P CONNECTO R
I s ther e batter y voltage ? Repai
r ope n i n th e wire(s )
betwee n th e rea r fail-saf e rela y
and modulato r unit .
(To pag e 19-88 )
Terminal sid e o f mal e terminal s
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Troubleshooting
DTC 7-4 : Rea r Solenoi d (cont'd )
(From pag e 19-87 )
Check th e solenoid :1. Measur e th e resistanc ebetween th e modulato r uni t14P connecto r terminal s t o
determin e th e solenoi d stan -
dar d resistanc e ( A typ e o r B
type) .
Inlet:— No . 8 an d No . 1 2— No . 1 0 an d No . 1 4Outlet :— No . 1 an d No . 5— No . 3 an d No . 72 . Measur e th e resistanc ebetween th e modulato r uni tHP connecto r terminal s No . 2an d No . 6 , an d terminal s No . 9an d No . 13 .
Is th e resistanc e a s specified ?Inlet: 2.5 - 2. 9 o r 6.5 - 7. 5Outlet : 2.5-2. 9 o r 3.3-3. 9
Check fo r a shor t t o bod y groun d
i n th e solenoid :
Chec k fo r continuit y betwee n bod y
groun d an d th e modulato r uni t14P connecto r terminal s No . 2 an dNo. 1 3 individually .
Is ther e continuity ?
Chec k fo r a shor t i n th e SOLE -
NOI D circuit :
Chec k fo r continuit y betwee n th e
modulato r uni t 14 P connecto r ter -
minal s No . 2 an d No . 13 .
I s ther e continuity ?
(T o pag e 19-89 )
NOTE :
Inlet Solenoi d
Outle t Solenoi d
STANDAR D RESISTANC E
A TYP E
2.5 - 2. 9
2.5-2. 9
B TYP E
6.5-7. 5
3.3 - 3. 9
MODULATO R UNI T 14 P CONNECTO R
Visuall y inspec t th e modulato r
wir e harness . I f th e harnes s is OK ,
replac e th e modulato r unit . (Ope nor shor t i n th e rea r inle t o r outle t
solenoid ) Wir
e sid e o f femal e terminal s
Visuall y inspec t th e modulato r
wir e harness . I f th e harnes s i s
OK , replac e th e modulato r unit .
(Shor t t o bod y groun d in th e rea r
inle t o r outle t solenoid )
Replac e th e modulato r wir e har -
ness . (Shor t t o th e R-OU T circui t
i n th e R-I N circuit )
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MODULATOR UNI T U P CONNECTO R
(Fro m pag e 19-88 )
Chec k fo r a shor t i n th e modula -
to r wir e harness :
Chec k fo r continuit y betwee n th e
modulato r uni t 14 P connecto rterminal No . 1 3 an d th e followin g
terminals :
— No . 12 : Right-fron t inle t
— No . 1 : Right-fron t outle t— No . 14 : Left-fron t inle t
— No . 3 : Left-fron t outle t
I s ther e continuity ? Replac
e th e modulato r wir e har -
ness . (Shor t t o th e FR-IN , FR -
OUT , FL-I N o r FL-OU T circui t i n
th e R-I N circuit ) Wir
e sid e o f femal e terminal s
I s ther e continuity ? Replac
e th e modulato r wir e har -
ness . (Shor t t o th e FR-IN , FR -
OUT , FL-I N o r FL-OU T circui t i n
th e R-OU T circuit )
ABS CONTRO L UNI T 26 P CONNECTO R
Chec k fo r a shor t t o bod y groun d
i n th e R-I N an d R-OU T circuit :
1 . Disconnec t th e AB S contro l
unit 26 P connector .2. Chec k fo r continuit y betwee nbody groun d an d terminal sNo. 3 an d No . 1 6 individually .
Is ther e continuity ? Repai
r shor t t o bod y groun d i n
th e R-I N o r R-OU T circui t betwee n
th e AB S contro l uni t an d modula -
tor unit .
Chec k fo r a shor t i n th e R-I N an d
R-OU T circuit :
Check fo r continuit y betwee n th eAB S contro l uni t 26 P connecto r
terminal s No . 3 an d No . 16 .
I s ther e continuity ?
(T o pag e 19-90 ) Repai
r shor t t o th e R-OU T circui t
i n th e R-I N circui t betwee n th e
AB S contro l uni t an d modulato r
unit.
Chec k fo r a shor t i n th e modula -
to r wir e harness :
Chec k fo r continuit y betwee n th e
modulato r uni t 14 P connecto rterminal No . 2 an d th e followin gterminals :— No . 12 : Right-fron t inle t— No . 1 : Right-fron t outle t— No . 14 : Left-fron t inle t— No . 3 : Left-fron t outle t
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Troubleshooting
DTC 7-4 : Rea r Solenoi d (cont'd )
(From pag e 19-89 )
Chec k fo r a shor t i n th e R-I N cir -
cuit:Chec k fo r continuit y betwee n th e
AB S contro l uni t 26 P connecto r
terminal No . 3 an d th e followin gterminals :
— No . 2 : Right-fron t inle t
— No . 15 : Right-fron t outle t
— No . 1 : Left-fron t inle t— No . 14 : Left-fron t outle t
Is ther e continuity ?
Is ther e batter y voltage ?
(To pag e 19-91 ) AB
S CONTRO L UNI T 26 P CONNECTO R
Repai r shor t t o th e FR-IN , FR -
OUT , FL-I N o r FL-OU T circui t i n
th e R-I N circui t betwee n th e AB S
contro l uni t an d modulato r unit .
Wire sid e o f femal e terminal s
Repai r shor t t o th e FR-IN , FR -
OUT , FL-I N o r FL-OU T circui t i n
th e R-OU T circui t betwee n th e
AB S contro l uni t an d modulato r
unit.
NOTE : Leav e jumpe r wir e
i n fail-saf e rela y connector .
Repai r ope n in th e R-I N o r R-OU T
circuit betwee n th e AB S contro lunit an d modulato r unit .
Chec k fo r a shor t i n th e R-OU T
circuit :
Chec k fo r continuit y betwee n th e
AB S contro l uni t 26 P connecto rterminal No . 1 6 an d th e followin gterminals :— No . 2 : Right-fron t inle t— No . 15 : Right-fron t outle t
— No . 1 : Left-fron t inle t
— No . 14 : Left-fron t outle t
Is ther e continuity ?
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(From pag e 19-90 )
ABS CONTRO L UNI T 22 P CONNECTO R
Chec k fo r a n ope n in th e GN D cir -
cuit :1. Disconnec t th e AB S contro lunit 22 P connector .2. Chec k fo r continuit y betwee ntermina l No . 1 0 an d bod yground .
Is ther e continuity ? Repai
r ope n in th e wir e betwee n
th e AB S contro l uni t an d bod y
ground , o r poo r ground .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 FS R circuit :
1 . Remov e th e fron t fail-saf e
relay.2. Remov e th e jumpe r wir e fro m
th e rea r fail-saf e rela y connec -
tor.3. Chec k fo r continuit y betwee nthe AB S contro l uni t 22 P con -necto r termina l No . 1 an d bod yground .
Is ther e continuity ? Repai
r shor t t o bod y groun d i n
th e wir e betwee n th e AB S con -
tro l uni t an d rea r fail-saf e relay .
REAR FAIL-SAF E RELA Y CONNECTO R
Check fo r a n ope n in th e FS R cir -
cuit :
1 . Connec t th e rea r fail-saf e rela y
termina l No . 4 to bod y groun d
with a jumpe r wire .2. Chec k fo r continuit y betwee nthe AB S contro l uni t 22 P con -necto r termina l No . 1 an d
bod y ground . JUMPE
R
WIRE
Termina l sid e o f femal e terminal s
AB S CONTRO L UNI T 22 P CONNECTO R
Is ther e continuity ?Repair ope n in th e wir e betwee nthe AB S contro l uni t an d rea rfail-saf e relay .
Wire sid e o f femal e terminal s
(To pag e 19-92 )
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Troubleshooting
DTC 7-4 : Rea r Solenoi d (cont'd )
(From pag e 19-91 )
Chec k fo r a n ope n in th e GN D cir -
cuit :1. Remov e th e jumpe r wire fromthe rea r fail-saf e rela y connec -tor.2. Chec k fo r continuit y betwee nthe rea r fail-saf e rela y connec -tor termina l No . 3 an d bod yground .
REAR FAIL-SAF E RELA Y CONNECTO R
I s ther e continuity ?
Repair ope n in th e wir e betwee nthe rea r fail-saf e rela y an d bod yground , o r poo r ground .
Termina l sid e o f femal e terminal s
Check fo r loos e AB S contro l uni tconnectors . I f necessary , substi -tute a known-goo d AB S contro lunit an d recheck .
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DTC 8-1 : AB S Functio n
The AB S contro l uni t monitor s th e AB S functionin g tim e durin g regula r diagnosis , an d it turn s th e AB S indicato r ligh t o n if
th e AB S is functionin g fo r a prolonge d time .
Possibl e causes :
Wheel senso r signa l disappear s a t speed s o f 6 mp h (1 0 km/h ) o r les s
Fault y AB S contro l uni t
— Wit h engin e running , AB S indi -
cato r ligh t i s ON .
— Wit h th e SC S servic e connec -
to r connecte d (se e pag e 19-40 ),
DT C 8- 1 is indicated .
Proble m verification :
Test-driv e th e vehicl e a t speed s
o f 1 2 mp h (2 0 km/h ) o r mor e fo r
mor e tha n 2 minutes .
Does th e AB S indicato r ligh tcom e on ? Th
e syste m is O K a t thi s time .
Chec k fo r loos e whee l senso r
connectors , an d chec k th e senso rinstallatio n (intermitten t trou -ble).Probabl e caus e wa s drivin g ove rroug h roads .
Is cod e 8- 1 indicated ? Perfor
m th e appropriat e trouble -
shootin g fo r th e code .
Replac e th e AB S contro l unit .
Confir
m th e DT C (se e pag e 19-40 ).
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Troubleshooting
DTC 8-2 : CPU , DT C 8-4:I C
DTC 8-2 : CPU
The AB S contro l uni t check s th e dat a o f th e tw o CPU s b y comparison , an d i t keep s th e AB S indicato r ligh t o n i f ther e ar e
an y difference s i n th e dat a betwee n th e CPUs . I t turn s th e AB S indicato r ligh t o n agai n i f i t detect s an y differenc e afte r th e
ligh t goe s off .
Doe s th e AB S indicato r ligh t
com e on ?
Is cod e 8- 2 indicated ?
The syste m is O K at thi s time .
Perfor m th e appropriat e trou -
bleshootin g fo r th e code .
DTC 8-4:I C (Integrate d Circuit )
Th e AB S contro l uni t check s th e interna l IC s durin g th e initia l diagnosi s an d regula r diagnosis , an d i t keep s th e AB S indicato r
ligh t o n if i t detect s an y abnormality . I t turn s th e AB S indicato r ligh t o n agai n if i t detect s any abnormalit y afte r th e ligh t goe s off .
Replac e th e AB S contro l uni t i f DT C 8- 4 is indicate d wit h th e SC S servic e connecto r connecte d (se e pag e 19-40 ).
Wit h engin e running , AB S indi -cato r ligh t i s ON .With th e SC S servic e connec -
to r connecte d (se e pag e 19-40 ),
DT C 8- 2 is indicated .
Problem verification :Start th e engine .
Confirm th e DT C (se e pag e 19-40 ).
Replac e th e AB S contro l unit .
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