engine ACURA RL KA9 1996 Service Repair Manual

DTC 6 : Fron t an d Rea r Fail-saf e Relay s
The 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 durin g th e initia l diagnosi s whe n th e fail -
safe relay s ar e OFF . Th e AB S contro l uni t keep s th e AB S indicato r ligh t o n if i t detect s batter y voltag e a t th e fron t an d rea r
solenoi d circuits .
Possible causes :
Short t o powe r i n th e rela y driv e circuit s betwee n th e fail-saf e relay s an d AB S contro l uni t
Fault y rela y driv e transisto r (ON ) i n th e AB S contro l uni t
Doe s th e AB S indicato r ligh t g ooff ?
Th e AB S is O K a t thi s time . Chec k
fo r damage d wir e harnes s
betwee n th e AB S contro l unit ,
solenoid s an d fail-saf e relay s (inter -
mitten t shor t t o power) .
I s cod e 6 indicated ? Perfor
m th e appropriat e trouble -
shootin g fo r th e code .
(T o pag e 19-70 )
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 6 is indicated .
Proble m verification :
Star t th e engine .
Confir m th e DT C tha t appear s first .
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Troubleshooting
DTC 6 : Fron t an d Rea r Fail-saf e Relay s (cont'd )
(From pag e 19-69 )
Chec k fo r a shor t t o powe r i n th e
FS R circuit :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e AB S contro lunit 22 P connector .3. Star t th e engine .
4 . Measur e th e voltag e betwee n
termina l No. 1 an d bod yground .
ABS CONTRO L UNI T 22 P CONNECTO R
I s ther e batter y voltage ? Repai
r shor t t o powe r i n th e wir e
betwee n th e ABS contro l unit ,and fron t an d rea r fail-saf e relays .
I s ther e batter y voltage ? Replac
e th e AB S contro l unit .
(Fault y fail-saf e rela y driv e tran -
sistor )
Perfor m th e troubleshootin g fo r
DT C 6- 1 (se e pag e 19-71 ) an d
DT C 6- 4 (se e pag e 19-74 ). Wir
e sid e o f femal e terminal s
Chec k th e AB S contro l unit :
1. Tur n th e ignitio n switc h OFF .2. Connec t th e AB S contro l uni t22P connector .3. Tur n th e ignitio n switc h O N (II) .4. Measur e th e voltag e betwee ntermina l No. 1 an d bod yground .
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DTC 6-1 : Fron t Fail-saf e Rela y
The 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 durin g th e initia l diagnosi s whe n th e fail -
safe relay s ar e OFF . Th e AB S contro l uni t keep s th e AB S indicator light o n if i t detect s batter y voltag e a t th e fron t solenoi d
circuits.
Possible causes :
Front fail-saf e rela y stuc k O N
Shor t t o powe r i n th e solenoi d driv e circuit s betwee n th e fron t fail-saf e rela y an d AB S contro l uni t
Doe s th e AB S indicato r ligh t g ooff ?
Is cod e 6- 1 indicated ?
YES
Chec k th e fron t fail-saf e rela y (se e
sectio n 23 ).
I s th e rela y OK ?
Chec k th e modulato r wir e har -
ness :1. Disconnec t th e modulato r uni t14P connector .2. Visuall y chec k th e modulato rwire harness .
Is ther e a shor t t o power ?
(T o pag e 19-72 ) Th
e AB S is O K a t thi s time . Chec k
fo r damage d wir e harnes s betwee n
th e AB S contro l unit , solenoid s an d
fail-saf e relay s (intermitten t shor t
t o power) .
Perfor m th e appropriat e trouble -
shootin g fo r th e code .
Replac e th e fron t fail-saf e relay .
Replac e th e modulato r wir e har -
nes s (o r repai r short) .
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 .
Wit h th e SC S servic e connec -
to r connecte d (se e pag e
19-40 ), DT C 6- 1 i s indicated .
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Troubleshooting
DTC 6-1 : Fron t Fail-saf e Rela y (cont'd )
(From pag e 19-71 )
Chec k fo r a shor t t o powe r i n th e
SOLENOI D circuit :
1. Star t th e engine .2. Measur e th e voltag e betwee n
th e fron t fail-saf e rela y connec -
to r No . 1 termina l an d bod y
ground .
I s ther e batter y voltage ?
Chec k fo r a shor t t o powe r i n th e
FR-I N circuit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e AB S contro l uni t
26 P connector .
3 . Star t th e engine .
4 . Measur e th e voltag e betwee n
termina l No . 2 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a shor t t o powe r i n th e
FL-I N circuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 26 P connecto r
termina l No . 1 an d bod y ground .
I s ther e batter y voltage ?
(T o pag e 19-73 )
FRON T FAIL-SAF E RELA Y CONNECTO R
NOTE: Th e fail-saf e relay s ar e OF F whe n th e
AB S indicato r ligh t i s kep t on .SOLENOI D(BRN/BLK )
Repair shor t t o powe r i n th e wir e
betwee n th e fron t fail-saf e rela y
and modulato r unit .
Termina l sid e o f femal e terminal s
NOTE : Chec k wit h th e modulato r uni t U P
connecto r disconnected . AB
S CONTRO L UNI T 26 P CONNECTO R
Repai r shor t t o powe r i n th e wir e
betwee n th e AB S contro l uni t
an d modulato r unit .
Wire sid e o f femal e terminal s
Repair shor t t o powe r i n th e wir e
betwee n th e AB S contro l uni t
an d modulato r unit .
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Troubleshooting
DTC 6-4 : Rea r Fail-saf e Rela y
The 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 during the initia l diagnosi s whe n th e fail -
safe relay s ar e OFF . Th e AB S contro l uni t keep s th e AB S indicato r ligh t o n i f i t detect s th e batter y voltag e a t th e tw o rea r
solenoi d circuits .
Possible causes :
Rear fail-saf e rela y stuc k O N
Shor t t o powe r i n th e solenoi d driv e circuit s betwee n th e rea r fail-saf e rela y an d AB S contro l uni t
Doe s th e AB S indicato r ligh t g ooff ?
Th e AB S is O K a t thi s time . Chec k
fo r damage d wir e harnes s bet -
wee n th e AB S contro l unit , sole -
noi d an d rea r fail-saf e rela y
(intermitten t shor t t o power) .
I s cod e 6- 4 indicated ? Perfor
m th e appropriat e trouble -
shootin g fo r th e code .
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 th e modulato r wir e har -
ness :1. Disconnec t th e modulato r uni t14P connector .2. Visuall y chec k th e modulato r
wir e harness .
I s ther e a shor t t o power ? Replac
e th e modulato r wir e har -
nes s (o r repai r short) .
(T o pag e 19-75 )
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 -
to r connecte d (se e pag e
19-40 ), DT C 6- 4 is indicated .
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(From pag e 19-74 )
REAR FAIL-SAF E RELA Y CONNECTO R
Check fo r a shor t t o powe r i n th e
SOLENOI D circuit :
1 . Star t th e engine .
2 . Measur e th e voltag e betwee n
th e rea r fail-saf e rela y connec -
tor termina l No . 1 an d bod yground .
NOTE: Th e fail-saf e relay s ar e OF F whe n th eAB S indicato r ligh t i s kep t on .SOLENOI D(BLU/BLK )
Is ther e batter y voltage ? Repai
r shor t t o powe r i n th e wir e
betwee n th e rear fail-saf e rela y
an d modulato r unit .Termina l sid e o f femal e terminal s
Check fo r a shor t t o powe r i n th e
R-I N circuit :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e AB S contro l uni t
26 P connector .
3 . Star t th e engine .
4 . Measur e th e voltag e betwee n
terminal No . 3 an d bod y ground .
NOTE: Chec k wit h th e modulato r uni t U P
connecto r disconnected .
I s ther e batter y voltage ? Repai
r shor t t o powe r i n th e wir e
betwee n th e AB S contro l uni tand modulato r unit . Wir
e sid e o f femal e terminal s
Chec k fo r a shor t t o powe r i n th e
R-OU T circuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 26 P connecto rterminal No . 1 6 an d bod y ground .
I s ther e batter y voltage ? Repai
r shor t t o powe r i n th e wir e
betwee n th e AB S contro l uni t
an d modulato r 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 . AB
S CONTRO L UNI T 26 P CONNECTO R
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Troubleshooting
DTC 7-1 : Right-fron t 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
th e right-fron t solenoi d 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 i s started . I t
turn s th e AB S indicato r ligh t o n agai n if i t detect s 0 V after th e ligh t goe s off .
Possibl e causes :
Open circui t i n th e right-fron t solenoi d driv e circuit s betwee n th e fron t fail-saf e rela y an d AB S contro l uni t
Shor t circui t t o bod y groun d i n th e right-fron t solenoi d driv e circuit s betwee n th e solenoid s an d AB S contro l uni t
Fault y right-fron t solenoi d driv e transisto r (ON ) i n th e AB S contro l uni t
Th e 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 t o tur n th e solenoi d on ) durin g
th e 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 right-fron t 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
indicato r ligh t on . I t turn s th e AB S indicato r ligh t o n agai n i f i t detect s batter y voltag e whe n th e vehicl e is driven .
Possibl e causes :
Short circui t t o powe r i n th e right-fron t solenoi d driv e circuit s betwee n th e solenoid s an d AB S contro l uni t
Fault y right-fron t 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 right-fron t solenoi d driv e circuit s i n th e modulato r wir e harnes s o r solenoid s
Shor t circui t t o th e right-fron t solenoi d outle t circui t i n th e inle t circui t betwee n th e solenoi d 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 l
unit , fail-saf e rela y an d modulato r
unit (intermitten t ope n o r shor tcircuit) .
Is cod e 7- 1 indicated ?Perform th e appropriat e trouble -shootin g fo r th e code .
(To pag e 19-77 )
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- 1 is indicated .
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Troubleshooting
DTC 7-2 : Left-fron t 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
th e left-fron t solenoi d 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 O V after th e ligh t goe s off .
Possibl e causes :
Fron t fail-saf e rela y stuc k OF F
Ope n circui t i n th e left-fron t 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 left-fron t solenoi d driv e circuit s betwee n th e solenoid s an d AB S contro l uni t
Fault y left-fron t solenoi d driv e transisto r (ON ) i n th e AB S contro l unit .
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 left-fron t 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
indicato 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 is driven .
Possibl e causes :
Shor t circui t t o powe r i n th e left-fron t solenoi d driv e circuits betwee n th e solenoid s an d AB S contro l uni t
Fault y left-fron t 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 left-fron t solenoi d driv e circuit s i n th e modulato r wir e harnes s o r solenoid s
Shor t circui t t o th e left-fron t 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 solenoi d inle t o r outle t circui t i n th e left-fron t 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- 2 indicated ?Perform th e appropriat e trouble -shooting fo r th e code .
(To pag e 19-81 )
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- 2 is indicated .
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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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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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