ACURA RL KA9 1996 Service Repair Manual

TCS Contro l Valv e Assembl y
Replacemen t
CAUTION: B e carefu l no t t o damag e th e TC S contro l valv e whe n handlin g th e TC S contro l valv e assembly .
1 . Disconnec t th e vacuu m tube , breathe r pip e an d ai r hos e fro m th e intak e ai r duct .
2 . Loose n th e intak e ai r duc t ban d screws , the n remov e th e intak e ai r duct .
BREATHE R PIP E
AIR HOS E
NOTE : Whe n installin g th e duct ,
align th e marks .
NOTE: Whe n installin g th e duct ,align th e cutou t wit h mark .
VACUU M TUB E
INTAK E AI R DUC T
BAN D SCRE W
INTAK E AI R DUC T
3. Disconnec t th e TC S contro l valv e angl e senso r connecto r an d actuato r connector .
4. Remov e th e TC S contro l valv e assembl y an d bracket .
5 . Instal l th e TC S contro l valv e assembl y i n th e revers e orde r o f removal .
TCS CONTRO L VALV E ANGL ESENSO R CONNECTO R
6 x 1. 0 m m BOL T
1 2 N- m (1. 2 kgf-m , 9 Ibf-ft )
TCS CONTRO L VALV E
ASSEMBL Y
8 x 1.2 5 mm NU T22 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
TC S CONTRO L VALV E
ACTUATO R CONNECTO R
BRACKET8 x 1.2 5 m m BOL T
2 2 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
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TCS Switc h
TCS Contro l Uni t
Test
1. Remov e th e TCS/CRUIS E switc h fro m th e switc h
panel.
Replacemen t
TCS/CRUISE SWITC H
2. Chec k fo r continuit y betwee n termina l No . 1 an d
No . 2 (Illuminatio n ligh t circuit ) an d betwee n termi -
na l No . 3 an d No . 4 (switc h circuit) .
Ther e shoul d b e continuit y whe n th e switc h i s
pushed , an d ther e shoul d b e n o continuit y whe n th e
switc h is released .
1. Remov e th e rea r seat-bac k (se e sectio n 20 ).
2 . Disconnec t th e connector s fro m TC S contro l unit .
TCS CONTRO L UNI T
3. Remov e th e thre e bolt s an d th e TC S contro l unit .
4 . Instal l i n th e revers e orde r o f removal .
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Special Tool s
Ref. No .Too l Numbe r DescriptionQtyPag e Referenc e
07PAZ-001010 0 SC S Servic e Connecto r 19-20 6
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Component Locations

SERVICE CHECK CONNECTOR (2P)

RIGHT-REAR WHEEL SENSOR

VSA CONVERTER UNIT

VSA MODULATOR

CONTROL UNIT

TCS CONTROL

VALVE SENSOR

RIGHT-FRONT

WHEEL SENSOR
PRECHARGE

PUMP MOTOR
STEERING

ANGLE SENSOR

YAW RATE/LATERAL

ACCELERATION SENSOR

TCS CONTROL VALVE

ACTUATOR

UNDER-HOOD

RELAY BOX C
UNDER-HOOD

FUSE/RELAY BOX
VSA OFF SWITCH

UNDER-DASH FUSE/RELAY BOX

LEFT-FRONT WHEEL SENSOR
LEFT-REAR

WHEEL SENSOR

GAUGE ASSEMBLY

ABS INDICATOR

VSA SYSTEM INDICATOR
UNDER-HOOD FUSE/RELAY BOX

STOP/HORN

(20 A) FUSE

BRAKE SYSTEM INDICATOR

VSA ACTIVATION INDICATOR

UNDER-DASH FUSE/RELAY BOX
TCS

(15 A) FUSE

VSA

(20 A) FUSE

METER

(15 A) FUSE

ECU

(20 A) FUSE

METER

(7.5 A) FUSE
BATTERY

(120 A) FUSE

VSA MOTOR (40 A) FUSE

IG SW (50 A) FUSE

UNDER-HOOD RELAY BOX C

FAIL-SAFE RELAY

GAUGE RELAY
PCM

R/C MIRROR

(7.5 A) FUSEProCarManuals.com

Terminal Arrangemen t
VSA CONTRO L UNI T 42 P CONNECTO R
Wire sid e o f femal e terminal s
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Terminal
number
23
2 4
25
2 6
27
2 8
2 9
30
3 1
3 2
33
3 6
38
39
4 0
4 1
42
Wir e
colo r
YEL/BL K
WHT
YEL
BLU
WHT/BL K
GRN/BLU
GRY
BLU/YE L
GRN/YE L
GRN/WH T
LT GRN /
RED
GRN/WH T
GRN/RED
YEL
PNK
BLK
GR N
Termina l
sign
IG2
CA N (+ )
PS M
PS S
VS A
OF F S W
FL S (+ )
RLS (- )
RR S (- )
RR S (+ )
STO P
VSA
BFL
PAR K
YRS A
YU
CA N ( - )
YRS S
PSU
Descriptio n
Power sourc e fo r activatin g th e
syste m
Communicatio n signa l
Groun d fo r th e pressur e senso r
Detect s pressur e senso r signa l
Detect s VS A of f switc h signa l
Detect s left-fron t whee l senso r signa l
Detect s left-rea r whee l senso r signa l
Detects right-rea r whee l senso r signa l
Detect s brak e peda l positio n switc h
signa l
Drive s VS A syste m indicato r
Detect s brak e flui d leve l switc h signa l
Detect s parkin g brak e switc h signa l
Powe r sourc e fo r th e ya w rate/latera l
acceleratio n senso r
Communicatio n signa l
Detect s ya w rat e senso r signa l
Powe r sourc e fo r th e pressur e senso r
Measuremen t (Wit h th e VS A contro l uni t 42 P
connecto r disconnected )
Terminals
23-GND
27-GN D
28-13
29-1 4
30-31
32-GN D
33-GND
36-GN D
38-GND
Condition s
Ignition switc h O N
(II)
Pres s th e VS A of f
switc h wit h th e igni -
tion switc h O N (II )
Whee l
Pres s th e brak e
peda l
Ignitio n switc h O N
(ID
Wit h th e igni -
tion switc h
ON (II) , the —— —
brake flui d
leve l i s
Wit h th e
ignitio n Presse d
switc h O N
(II) , park -
in g brak e Release d
peda l i s
Voltag e
Battery
Voltag e
Battery
Voltag e
AC: 0.05 3 V
o r abov e
Referenc e
Oscilloscop e
0.15 Vp- p or
abov e
Batter y
Voltag e
About 5 V
Batter y
Voltag e
0V
0 V
Batter y
Voltag e
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Terminal Arrangement

VSA CONVERTER UNIT 26P CONNECTOR

Wire side of female terminalsProCarManuals.com

Terminal

number
Wire

color
Terminal

sign
Description
Measurement (With the VSA converter unit 26P

connector connected)

Terminals
Conditions
VoltageProCarManuals.com

Troubleshooting Precaution s
System Indicator s
If th e syste m is OK , th e AB S indicato r goe s of f onc e afte r turnin g th e ignitio n switc h O N (II ) withou t startin g th e engine ,
an d the n com e o n agai n an d g o of f severa l second s late r afte r startin g th e engine . Thi s occur s becaus e th e VS A contro l
uni t i s turne d o n b y th e IG 2 powe r source .
Th e AB S indicato r o r VS A syste m indicato r come s o n whe n th e VS A contro l uni t detect s a proble m in th e system .
Th e AB S indicato r o r VS A syste m indicato r wil l als o com e o n unde r thes e conditions , eve n thoug h th e syste m is oper -
atin g properly :
— Th e vehicl e goe s int o a spi n
— Th e AB S continue s t o operat e fo r a lon g tim e
— Th e vehicl e is subjecte d to a n electrica l signa l disturbanc e
I f ther e is a faul t i n th e PGM-F I system , onl y th e VS A syste m indicato r come s on .
Th e VS A Activatio n Indicato r wil l flas h whe n onl y th e driv e wheel s rotat e o r on e o f th e driv e wheel s is stuck . Whe n thi s
occurs , th e AB S indicato r an d VS A syste m indicato r d o no t com e on .
T o determin e th e actua l caus e o f th e problem , questio n th e custome r abou t th e problem , takin g thes e condition s int o con -
sideration .
Whe n a proble m is detecte d an d th e AB S o r VS A indicato r come s on , ther e ar e case s whe n th e indicato r stay s o n unti l
th e ignitio n switc h i s turne d OFF , an d case s whe n th e indicato r goe s of f automaticall y whe n th e syste m return s t o nor -
mal . Fo r DT C 6 1 an d 62 , th e indicato r goe s of f automaticall y whe n th e syste m return s t o normal . Fo r al l othe r codes ,
th e indicato r stay s o n unti l th e ignitio n switc h is turne d OFF .
Fo r DTC s 12 , 14 , 16 , 18 , 51 , 52 , 53 , 66 , 6 8 an d 84 , th e AB S indicato r goe s of f whe n th e vehicl e is drive n agai n an d th e
syste m is O K afte r th e ignitio n switc h is turne d fro m OF F to O N (II) . However , i f th e DT C is cleared , th e CP U reset s an d
th e indicato r goe s of f righ t afte r th e engin e is starte d if th e syste m is OK .
Th e AB S is no t operationa l whe n th e AB S indicato r i s ON ; th e VS A is no t operationa l whe n th e VS A indicato r i s ON .
Whe n th e VS A indicato r an d MI L ar e bot h ON , troubleshoo t th e PGM-F I syste m first .
Diagnosti c Troubl e Cod e (DTC )
Th e memor y ca n hol d an y numbe r o f DTCs . However , whe n th e sam e DT C is detecte d mor e tha n once , th e mor e recen t
DT C is writte n ove r th e earlie r one . Therefore , whe n th e sam e proble m is detecte d repeatedly , i t i s memorize d a s a sin -
gle DTC .
The DTC s ar e indicate d in ascendin g numbe r order , no t i n th e orde r the y occur .
Th e DTC s ar e memorize d in th e EEPRO M (non-volatil e memory) . Therefore , th e memorize d DTC s canno t b e cancele d
b y disconnectin g th e battery . Perfor m th e specifie d procedure s to clea r th e DTCs .
Self-diagnosi s
Self-diagnosis can be classifie d int o tw o categories :
— Initia l diagnosis : Performe d righ t afte r th e engin e start s an d unti l th e AB S o r VS A indicato r goe s off .
— Regula r diagnosis : Performe d righ t afte r th e initia l diagnosi s unti l th e ignitio n switc h is turne d OFF .
When a proble m is detecte d b y self-diagnosis , th e VS A contro l uni t shift s to fail-saf e mode .
Kickbac k
The pum p moto r operate s whe n th e AB S is functioning , an d th e flui d in th e reservoi r i s force d ou t t o th e maste r cylinder ,
causing kickbac k a t th e brak e pedal .
Pum p Moto r
Th e pum p moto r operate s whe n th e AB S is functioning .
The VS A contro l uni t check s th e pum p moto r operatio n durin g initia l diagnosi s whe n th e vehicl e is started .
You ma y hea r th e moto r operat e a t thi s time , bu t i t i s normal .
Brak e Flui d Replacement/Ai r Bleedin g
Brak e flui d replacemen t an d ai r bleedin g procedure s ar e identica l t o th e procedure s us e o n vehicle s no t equippe d wit h
VSA . T o eas e bleeding , star t wit h th e fron t wheels .
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Troubleshooting
The troubleshootin g flowchar t procedure s assum e tha t th e caus e o f th e proble m is stil l presen t an d th e AB S indicato r
and/o r VS A syste m indicato r i s stil l on . Followin g th e flowchar t whe n th e AB S indicato r and/o r VS A syste m indicato r doe s
no t com e o n can resul t i n incorrec t diagnosis .
Th e connecto r illustration s sho w th e femal e termina l connector s wit h a singl e outlin e an d th e mal e termina l connector s
wit h a doubl e outline .
1 . Questio n th e custome r abou t th e condition s whe n th e proble m occurs , an d tr y t o reproduc e th e sam e condition s fo r
troubleshooting . Fin d ou t whe n th e AB S indicato r and/o r VS A syste m indicato r cam e on , suc h a s durin g AB S control ,
afte r AB S control , whe n vehicl e spee d wa s a t a certai n speed , etc .
2 . Whe n th e AB S indicato r o r VS A syste m indicato r doe s no t com e o n durin g th e test drive , bu t troubleshootin g i s per -
forme d base d o n th e DTC , chec k fo r loos e connectors , poo r contac t o f th e terminals , etc . befor e yo u star t troubleshoot -
ing.
3. Afte r troubleshooting , clea r th e DTC , an d test driv e th e vehicle . Mak e sur e th e AB S indicato r an d VS A syste m indicato r
d o no t com e on .
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