ACURA RL KA9 1996 Service Repair Manual

(From pag e 19-52 )
Chec k fo r a shor t i n th e under -
hoo d fuse/rela y box :
1 . Remov e th e AB S pum p moto r
relay.2. Disconnec t th e under-hoo d
fuse/rela y bo x 5 P connector .
3 . Chec k fo r continuit y betwee n
th e AB S pum p moto r rela y
connecto r PM R termina l an d
bod y ground .
I s ther e continuity ?
Chec k fo r a shor t i n th e PM R cir -
cuit :
1 . Disconnec t th e AB S contro l
uni t 22 P connector .
2 . Chec k fo r continuit y betwee n
termina l No . 2 1 an d bod y
ground .
NOTE:Short t o bod y groun d i n 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 .
I f th e moto r rela y coi l i s shorte d t o bod y
ground , th e moto r ma y b e damaged . Chec k
th e pum p moto r operation . UNDER-HOO
D FUSE/RELA Y BO X
PM R TERMINA L
Replac e th e under-hoo d fuse /
relay box .(Shor t circui t insid e th e box )
ABS CONTRO L UNI T 22 P CONNECTO R
I s ther e continuity ?
Repair shor t t o bod y groun d in th ewir e betwee n th e under-hoo d
fuse/rela y bo x an d AB S contro l
unit . Wir
e 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 .
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Troubleshooting
DTC 1-3 : High-Pressur e Leakag e
The AB S contro l uni t count s th e numbe r o f time s tha t th e AB S pum p moto r operate s an d stop s durin g regula r diagnosis .
Whe n th e AB S pum p moto r repeatedl y operate s an d stops , th e AB S contro l uni t determine s tha t th e high-pressur e syste m
i s leakin g an d turn s th e AB S indicato r ligh t on . Thi s coun t i s rese t whe n th e AB S functions .
Possibl e causes :
Leakin g outle t valv e
Leakin g relie f valv e
Poo r contac t i n pressur e switc h circui t
Is ther e leakage ? Chec
k th e modulato r reservoi r
an d th e accumulato r fo r brak e
flui d leakage , an d repai r a s nec -essary -Tighten th e modulato r uni t fit -ting .Replac e th e modulato r uni t i f i t
canno t b e repaired .
Chec k th e pressur e switc h opera -
tion:Star t th e engine .
Doe s th e AB S pum p moto r
operate ?
Wait fo r th e accumulato r ga s t ocool :1. Tur n th e ignitio n switc h OF Fafte r th e AB S pum p moto rstops, an d wai t fo r 3 0 minutes .2. Restar t th e engine .
(T o pag e 19-57 )
Wait unti l th e AB S pum p moto rstops.
Doe
s th e AB S pum p moto r
operate ?
Chec
k th e modulato r uni t fo r brak e
fluid leakage .
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 1- 3 is indicated .
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(From pag e 19-59 )
Chec k th e outle t valv e an d relie f
valv e fo r leakage :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e modulato r uni t
14 P connector .
3 . Afte r 3 0 minutes , chec k fo r con -
tinuit y betwee n terminal s No . 4
an d No . 11 .
Is ther e continuity ? Replac
e th e modulato r unit .
Leakin g outle t valv e
Leakin g relie f valv e Wir
e sid e o f femal e terminal s
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r loos e con -
nector s an d terminal s in th e pres -
sur e switc h circuit . MODULATO
R UNI T 14 P CONNECTO R
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Troubleshooting
DTC 1-4 : Pressur e Switc h
The AB S contro l uni t momentaril y activate s th e outle t solenoi d valv e an d count s th e numbe r o f time s tha t th e pressur e
switch signa l i s O N durin g th e initia l diagnosis . Whe n th e AB S contro l uni t doe s no t detec t th e pressur e switc h OF F signa l
at al l whe n th e engin e i s starte d an d stoppe d repeatedly , i t keep s th e AB S indicato r ligh t on . Th e coun t o f th e pressur e
switch O N signal s i s rese t whe n th e AB S contro l uni t detect s th e pressur e switc h OF F signal .
Possibl e causes :
Short t o bod y groun d betwee n th e AB S contro l uni t an d pressur e switc h
Pressur e switc h stuc k O N
Fault y AB S contro l uni t
MODULATO R UNI T 14 P CONNECTO R
Wir e sid e o f femal e terminal s
Visually inspec t th e modulato rwire harness . I f th e harnes s i s
OK , replac e th e modulato r unit .
(Pressur e switc h stuc k ON )
ABS CONTRO L UNI T 26 P CONNECTO R
NOTE: Chec k wit h th e modulato r uni t H Pconnecto r disconnected .
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e AB S contro l
uni t an d modulato r unit . Wir
e 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 .
I
s ther e continuity ?
Chec
k fo r a shor t t o bod y groun d
i n th e P-S W circuit :
1 . Disconnec t th e AB S contro l
uni t 26 P connector .
2 . Chec k fo r continuit y betwee n
termina l No . 1 9 an d bod yground .
Chec
k th e pressur e switch :
1 . Reliev e syste m pressur e (se e
page 19-97 ).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 ?
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 1- 4 is indicated .
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DTC 1-8 : High-Pressur e Syste m
When th e AB S contro l uni t detect s th e pressur e switc h OF F signa l durin g th e initia l diagnosis , i t drive s th e AB S pum p moto r
until th e pressur e switc h turn s ON . Then , i t momentaril y activate s th e outle t solenoi d valv e an d monitor s th e pressur e switc h
signal . 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 th e pressur e switc h OF F signa l a t thi s time .
Possibl e causes :
Accumulato r ga s leakag e
Change d relie f valv e se t pressur e
Rear outle t solenoi d valv e lat e t o clos e
Change d pressur e switc h se t pressur e
RELIEF PLU G
ACCUMULATO R
Is th e plu g OK ?Replac e th e accumulator .
Proble m verification :
Star t th e engin e an d allo w it t o ru n
unti l th e AB S indicato r ligh t goe soff, the n sto p th e engine .
Repea t thi s procedur e 1 0 times . NOTE
: I f ther e i s a problem , th e AB S pum p
moto r shoul d operat e th e secon d o r thir d tim e
yo u star t th e engine . Th e AB S pum p moto r
operate s fo r a shor t time .
Doe s th e AB S indicato r ligh t g o of f
eac h tim e th e engin e is started ? Intermitten
t failure , th e syste m is
O K a t thi s time .
Confir m th e DT C (se e pag e 19-40 ).
I s cod e 1- 8 indicated ? Perfor
m th e appropriat e trou -
bleshootin g flowchar t fo r th e
code .
Replac e th e accumulator .
(Accumulato r ga s leakage )
Replac e th e modulato r uni t i f th e
sympto m appear s again .
Relie f valv e se t pressur e
ou t o f spec .
Rea r outle t solenoi d valv e
lat e to close .
Pressur e switc h se t pres -
sure ou t o f spec .
NOTE : A norma l accumulato r wil l discharg e35 - 4 5 (1. 3 - 1. 7 fl-oz , 1.2-1. 6 Imp-oz ) o f
flui d whe n yo u reliv e syste m pressure .
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 1- 8 is indicated .
Chec k th e accumulato r relie f plug .
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Troubleshooting
DTC 2-1 : Parkin g Brak e
The AB S contro l uni t monitor s th e parkin g brak e signa l durin g th e regula r diagnosi s (durin g driving) .
I t turn s th e AB S indicato r ligh t o n if i t detect s th e parkin g brak e O N signa l fo r 3 0 seconds .
Possibl e causes :
Drivin g wit h th e parkin g brak e applie d
Lo w flui d leve l i n th e maste r cylinde r reservoi r
Blow n brak e syste m ligh t bul b
Ope n circui t o r shor t t o bod y groun d betwee n th e brak e syste m ligh t an d AB S contro l uni t
Parkin g brak e switc h stuc k O N
Shor t t o bod y groun d betwee n th e brak e syste m ligh t an d parkin g brak e switc h
Brak e flui d leve l switc h stuc k O N
Shor t t o bod y groun d betwee n th e brak e syste m ligh t an d brak e flui d leve l switc h
Faulty AB S contro l uni t
Doe s th e brak e syste m ligh t
com e on ?
Chec k fo r a n ope n in th e IG 1 cir -
cuit :
1 . Disconnec t th e gaug e assem -
bl y 22 P connector .
2 . Measur e th e voltag e betwee n
terminal No . 2 2 an d bod yground .
Is ther e batter y voltage ?
Chec k th e brak e syste m ligh t bulb .
Is th e bul b OK ?
(To pag e 19-61 ) (T
o pag e 19-62 ) GAUG
E ASSEMBL Y 22 P CONNECTO R
Mete r rela y stuc k OFF .
Repai r ope n in th e wir e betwee n
th e METE R (1 5 A ) fus e i n th e
under-hoo d fuse/rela y bo x an d
gaug e assembly .
Repai r ope n i n th e wir e be -
twee n th e METE R (7. 5 A ) fus e
i n th e under-das h fuse/rela y
bo x an d bod y ground .
Replac e th e brak e syste m ligh t
bulb .
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 2- 1 i s indicated .
Chec k th e brak e syste m ligh t
powe r source :
1. Tur n th e ignitio n switc h O N (II) .2. Pres s th e parkin g brak e pedal .
Wire sid e o f femal e terminal s
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(From pag e 19-60 )
Chec k th e gaug e assembly :
1 . Connec t th e gaug e assembl y
22 P connector .
2 . Connec t th e gaug e assembl y
30 P connecto r termina l No . 5
to bod y groun d wit h a jumpe rwire.
GAUG E ASSEMBL Y 30 P CONNECTO R
JUMPE R WIR E
Wire sid e o f femal e terminal s
Doe s th e brak e syste m ligh t
com e on ? Replac
e th e printe d circui t boar d
i n th e gaug e assembly .
Repai r ope n i n th e wir e betwee n
th e gaug e assembl y an d parkin g
brak e switch .
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Troubleshooting
DTC 2-1 : Parkin g Brak e (cont'd )
(From pag e 19-60 )
ABS CONTRO L UNI T 26 P CONNECTO R
Doe s th e brak e syste m ligh t
g o off ? Proble
m verification :
Test-driv e th e vehicl e a t speed s
o f 6 mp h (1 0 km/h ) o r mor e fo r
mor e tha n 3 0 seconds . Wir
e sid e o f femal e terminal s
Doe s th e AB S indicato r ligh t
com e on ?
The probabl e caus e wa s drivin gwith th e parkin g brak e applie d
fo r mor e tha n 3 0 seconds .
Check fo r a n ope n in th e PAR K cir -cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 26 P connecto rterminal No . 1 1 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 gaug e assembl y an d AB S con -
tro l unit .
I s th e leve l i s correct ? Chec
k th e fron t brak e pa d thick -
nes s an d brak e syste m fo r leaks .
I f ther e ar e n o problems , refil l th e
maste r cylinde r reservoi r t o th e
correc t level .
(T o pag e 19-63 ) Replac
e th e AB S contro l unit .
(Ope n circui t insid e th e unit )
Chec k th e brak e flui d leve l i n th e
maste r cylinde r reservoir .
Chec
k th e parkin g brak e switch :
Releas e th e parkin g brak e pedal .
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(From pag e 19-62 )
Chec k th e brak e flui d leve l switch :
Disconnec t th e brak e flui d leve l
switc h connectors .
Doe s th e brak e syste m ligh t g o off ? Replac
e th e brak e flui d leve l
switch . (Switc h stuc k ON )
I s th e switc h OK ? Replac
e th e parkin g brak e switch .
(Switc h stuc k ON )
Chec k fo r a shor t t o bod y groun d
i n th e PAR K circuit :
Disconnec t th e AB S contro l uni t26P connector .
Doe s th e brak e syste m ligh t
g o off ? Replac
e th e AB S contro l unit .
(Shor t t o bod y groun d insid e th e
unit )
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e brak e sys -
te m light , parkin g brak e switc h
an d brak e flui d leve l switch .
Chec
k th e parkin g brak e switc h
(se e pag e 19-8) .
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Troubleshooting
DTC 3-1 , 3-2 , 3-4 , 3-8 : Pulser , DT C 3-12 : Differen t Diamete r Tir e
DTC 3-1 , 3-2 , 3-4 , 3-8 : Pulse r
The AB S contro l uni t monitor s th e whee l senso r signal s durin g th e regula r diagnosi s (durin g driving) . I t turn s th e AB S indi -
cato r ligh t o n if i t detect s a periodi c chang e in th e whee l senso r signa l o f eac h whee l cause d b y a chippe d pulse r gear , etc .
Possibl e causes :
Chipped pulse r gea r
Improperl y installe d whee l senso r
DTC
3
1
2
4
8
Pulse r
Right-fron t
O
Left-front
O
Right-rea rLeft-rea r
O
DTC 3-12 : Differen t Diamete r Tir e
Th e AB S contro l uni t detect s th e whee l senso r signa l spee d durin g th e regula r diagnosi s (durin g driving) . Thi s diagnosi s is
no t performe d whe n th e parkin g brak e switc h signa l i s ON . Th e AB S contro l uni t ma y tur n th e AB S indicato r ligh t o n whe n
on e o r mor e differen t diamete r tire s ar e installed .
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