wheel ACURA RL KA9 1996 Service Owners Manual

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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DTC 11, 13, 15, 17: Wheel Sensor (Open/Short to Body Ground/Short to Power)

Check for a short to power in the

wheel sensor circuit:

1. Disconnect the VSA control

unit 42P connector.

2. Start the engine.

3. Measure the voltage between

the VSA control unit 42P con-

nector appropriate wheel sen-

sor (+) circuit terminal and

body ground (see table).
DTC

11 (Right-front)

13 (Left-front)

15 (Right-rear)

17 (Left-rear)
Appropriate Terminal

(+) Side

No. 16:FRS(+)

No. 28:FLS(+)

No. 31: RRS (+)

No.14: RLS(+)
(-) Side

No. 15: FRS(-)

No. 13:FLS (-)

No. 30:
RRS
(-)

No. 29: RLS (-)
VSA CONTROL UNIT 42P CONNECTOR

Is there battery voltage?
Repair short to power in the {+)

or (-) circuit wire between the

VSA control unit and appropriate

wheel sensor.
Wire side of female terminals

Check for a short to body ground

in the wheel sensor circuit:

1. Turn the ignition switch OFF.

2. Check for continuity between

the VSA control unit 42P con-

nector appropriate wheel sen-

sor (+) circuit terminal and

body ground (see table).

Is there continuity?
Repair short to body ground in

the (+) or (-) circuit wire between

the VSA control unit and the

appropriate wheel sensor.

Replace the appropriate wheel

sensor.

Check for an open in the wheel

sensor circuit:

Measure the resistance between

the VSA control unit 42P connector

appropriate wheel sensor (+) and

(-) circuit terminals (see table).

Is the resistance between

450 - 2,000 at 68°F?
• Repair open in the (+) or (-) cir-

cuit wire between the VSA con-

trol unit and the appropriate

wheel sensor.

• Replace the appropriate wheel

sensor.

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.ProCarManuals.com

Troubleshooting
DTC 12 , 14 , 16 , 18 : Whee l Senso r (Electrica l Noise/Intermitten t Interruption )
NOTE: If the ABS indicator comes on for the reasons described below, the indicator should go off when you test drive the
vehicle a t speed s abov e 1 9 mp h (3 0 km/h) .
Onl y th e driv e wheel s rotate d
Th e vehicl e spu n
Electrica l nois e
Is ther e continuity ?
DTC
12
1 4
16
18
Appropriat e Whee l Senso r
Right-fron t
Left-fron t
Right-rea r
Left-rear
Reinstal l o r replac e th e appropri -
at e whee l senso r o r pulser . VS
A CONTRO L UNI T 42 P CONNECTO R
DTC
12 (Right-front )
1 4 (Left-front )
16 (Right-rear )
18 (Left-rear )
Appropriat e Termina l
(+ ) Sid e
No. 16:FRS(+ )
No. 28:FLS(+ )
No. 31:RRS(+ )
No. 14:RLS(+ )
(-) Sid e
No. 15:FRS( - )
No . 13 : FL S (- )
No . 30 : RR S (- )
No . 29 : RL S (- )
Wir e sid e o f femal e terminal s
Repair shor t t o wir e betwee n th eappropriat e whee l senso r (+ ) an d
(- ) circuits .
DTC
12 (Right-front )
1 4 (Left-front )
16 (Right-rear )
18 (Left-rear )
Appropriat e
Termina l
No. 16:FRS(+ )
No. 28:FLS(+ )
No.31:RRS(+ )
No. 14:RLS(+ )
Other Termina l
No. 28 : FL S (+)
No . 16:FRS(+ )
No. 16 : FR S (+ )
No . 16 : FR S (+ )
No . 31:RRS(+ )
No . 31:RRS(+ )
No. 28 : FL S (+ )
No . 28 : FL S (+ )
No . 14:RLS(+ )
No. 14:RLS(+ )
No. 14 : RL S (+ )
No . 31 : RR S (+ )
Repai r shor t t o wir e betwee n th e
appropriat e whee l senso r an d
th e othe r whee l sensor .
Clear th e DTC , an d test-driv e th evehicle . I f th e AB S indicato rcomes o n an d th e sam e DT C i sindicated , replac e th e VS A mod -ulator-contro l unit .
Chec k fo r a shor t t o anothe r wir ein th e whee l senso r circuit :Check fo r continuit y betwee n th eappropriat e whee l senso r (+ ) circui ttermina l an d othe r whee l senso r(+) circui t terminal s (se e table) .
Is ther e les s tha n 45 0 ?
Visuall y chec k fo r appropriat ewheel senso r an d pulse r installa -tion (se e table) .
Are the y installe d correctly ?
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DTC 25 : Ya w Rat e Senso r
Do thes e component s mee t
th e norma l standards ?
Check fo r a shor t t o powe r i n th eYR S RE F circuit :
1 . Disconnec t th e VS A contro l
uni t 42 P connector , th e ya w
rate/latera l acceleratio n sen -
so r 6 P connector .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 1 0 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
YRS T circuit :Measur e th e voltag e betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 9 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
YRS S circuit :Measur e th e voltag e betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 4 1 an d bod y ground .
I s ther e batter y voltage ?
(To pag e 19-224 )
Repair t o norma l standards .
VSA CONTRO L UNI T 42 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t t o powe r i n th e wir e
betwee n th e ya w rate/latera l
acceleration senso r an d th e VS Acontro l unit .
Repai r shor t t o powe r i n th e wir e
betwee n th e ya w rate/latera l
acceleratio n senso r an d th e VS A
contro l unit .
Repai r shor t t o powe r i n th e wir e
betwee n th e ya w rate/latera l
acceleration senso r an d th e VS Acontro l unit .
Chec
k th e wheels , tires , suspen -
sion , an d alignment .
ProCarManuals.com

Troubleshooting
DTC 26 : Latera l Acceleratio n Senso r
Check th e wheels , tires , suspen -sion, an d alignment .
Do thes e component s mee t
th e norma l standards ?
Chec k fo r installatio n directio n o f
th e ya w rate/latera l acceleratio n
sensor.The senso r connecto r sid e mus t
b e facin g backward .
Is i t correct ?
Check fo r a shor t t o powe r i n th eAY circuit :1. Disconnec t th e VS A contro lunit 42 P connector , th e ya wrate/latera l acceleratio n sen -
so r 6 P connector .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 8 an d bod y
ground .
Is ther e batter y voltage ?
Chec k fo r a shor t t o bod y groun d
i n th e A Y circuit :
1. Tur n th e ignitio n switc h OFF .2. Chec k fo r continuit y betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 8 an d bod y
ground .
I s ther e continuity ?
(To pag e 19-227 )
Repair t o norma l standards .
Reinstall th e ya w rate/latera lacceleration senso r correctly .
VSA CONTRO L UNI T 42 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t t o powe r i n th e wir e
betwee n th e ya w rate/latera l
acceleration senso r an d th e VS Acontro l unit .
Repai r shor t t o bod y groun d in th ewir e betwee n th e ya w rate /lateral acceleratio n senso r a n d th e
VS A contro l unit .
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Troubleshooting

DTC 71: Abnormal Wheel Speed Signal

Are any DTCs except 71 indicated?

Check the tires.

Are tires with specified size and

inflated to specification?

Check for brake drag.

Do the brakes drag?

Visually check for appropriate

wheel sensor and pulser installa-

tion (see table).

Are they installed correctly?

Check the four pulser gears for a

chipped tooth (see table).

Is the pulser OK?

Problem Verification:

1. Clear the DTC.

2. Test-drive the vehicle at 19

mph (30 km/h) or more.

3. Verify the DTC.

Is DTC 71 indicated?

YES

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.
Preform the appropriate trou-

bleshooting for the DTC.

Replace the tire(s) with the spec-

ified size.

Repair the brake drag.

Reinstall or replace the wheel

sensor or pulser.

Replace the driveshaft or hub

unit. (Chipped pulser gear.)

The system is OK at this time.
Verify the DTC.ProCarManuals.com

Troubleshooting
DTC 83 : VS A Inhibitio n (cont'd )
(With DT C 35 fro m pag e 19-247 )
Check fo r a shor t t o bod y groun din th e T C ST B circuit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connec -
tor C (12P ) and th e VS A con -verte r uni t 26 P connector .
3 . Chec k fo r continuit y betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 2 4an d bod y ground .
I s ther e continuity ?
Check fo r a shor t t o bod y groun din th e T C F C circuit :
Chec k fo r continuit y betwee n th e
VS A converte r uni t 26 P connecto rterminal No . 2 2 an d bod y ground .
I s ther e continuity ?
Chec k the VSA converte r uni t
(TC STB) :1. Connec t th e VS A converte runit 26 P connecto r an d th ePC M connecto r C (12P) .2. Rais e th e fron t o f th e vehicle ,
an d suppor t i t wit h safet y
stands.3. Star t th e engine .
4 . Measur e th e voltag e betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 2 4
an d bod y ground .
I s th e voltag e a s specified ?
— VS A is functioning : abou t O V
— VS A is no t functioning : abou t5V
(T o pag e 19-249 )
VSA CONVERTE R UNI T 26 P CONNECTO R
Wire sid e o f femal e terminal s
Repair shor t t o bod y groun d i nth e wir e betwee n th e PC M an d
th e VS A converte r unit .
Repai r shor t t o bod y groun d i nth e wir e betwee n th e PC M an d
th e VS A converte r unit .
Chec k fo r loos e terminal s i n th eVS A converte r uni t 26 P connec -
tor . I f necessary , substitut e a
known-goo d VS A converte r unit ,
and recheck .
NOTE: Sto p th e wheel s b y pressin g th e
brak e peda l lightly .
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(From pag e 19-248 )
Check th e VS A converte r uni t(TC FC) :Measur e th e voltag e betwee n th e
VS A converte r uni t 26 P connecto r
terminal No . 2 2 an d bod y ground .
NOTE: Us e th e 1 0 V rang e o r a simila r
rang e in a n analo g tester .
VSA IS NO T VS A ISFUNCTIONIN G FUNCTIONIN G
VS A CONVERTE R UNI T 26 P CONNECTO R
I s th e voltag e a s specified ?
— VS A is functionin g (maximum) :
abou t 1.5 V
— VS A is no t functioning : abou t
4.5V
Chec k fo r loos e terminal s i n th eVSA converte r uni t 26 P connec -
tor . I f necessary , substitut e a
known-goo d VS A converte r unit ,
and recheck .
NOTE: Sto p th e wheel s b y pressin g th e
brak e peda l lightly .
Check fo r a n ope n i n th e T C ST Bcircuit :Measur e th e voltag e betwee n th e
PC M connecto r C (12P ) termina l
No . 1 2 an d bod y ground . Wir
e sid e o f femal e terminal s
PCM CONNECTO R C (12P )
Is ther e abou t 5 V whe n
VS A is no t functioning ? Repai
r ope n in th e wir e betwee n
th e VS A converte r uni t an d th e
PCM .
Wire sid e o f femal e terminal s
Chec k fo r a n ope n in th e T C F C
circuit :Measur e th e voltag e betwee n th e
PC M connecto r C (12P ) termina l
No . 1 0 an d bod y ground . NOTE
: Us e th e 1 0 V rang e o r a simila r rang e
i n a n analo g tester .
VSA IS NO T VS A ISFUNCTIONIN G FUNCTIONIN G
I s ther e abou t 4. 5 V whe n
VS A is no t functioning ? Repai
r ope n in th e wir e betwee n
th e VS A converte r uni t an d th e
PCM .
Chec k fo r loos e terminal s i n th e
PC M connectors . I f necessary ,
substitut e a known-goo d PCM ,
and recheck .
ProCarManuals.com

VSA Modulator-Control Unit

Removal/Installation

NOTE:

Do not spill brake fluid on the vehicle; it may damage the paint; if brake fluid does contact the paint, wash it off imme-

diately with water.

Take care not to damage or deform the brake lines during removal and installation.

To prevent the brake fluid from flowing, plug and cover the hose ends and joints with a shop towel or equivalent material.

Removal

1. Disconnect the pressure sensor 3P connector.

2. Pull the locking lever of the VSA control unit 42P connec-

tor up, then disconnect the connector.

3. Disconnect the six brake lines.

4. Remove the two 8 mm nuts.

5. Remove the VSA modulator-control unit.

Installation

1. Install the VSA modulator-control unit, then tighten the

two 8 mm nuts.

2. Align the connecting surfaces of the VSA control unit 42P

connector.

3. Push the locking lever of the VSA control unit 42P connec-

tor down until you hear a click.

4. Connect the pressure sensor 3P connector.

5. Connect the six brake lines.

6. Perform the precharge brake line bleeding (see page 19-

271).

7. Bleed the brake system, starting with the front wheels.

8. Start the engine, and check that the ABS indicator goes

off.

9. Test-drive the vehicle, and check that the ABS indicator

does not come on.

To right-rear

To left-rear

PRESSURE SENSOR

3P CONNECTOR

VSA MODULATOR

CONTROL UNIT
LOCKING LEVER

VSA CONTROL UNIT

42P CONNECTOR

To right-front

To left-front

FLARE NUT

15 N-m (1.5 kgf-m, 11 Ibf-ft)

MOUNTING BOLT

VSA CONTROL UNIT 42P CONNECTOR

8 mm BOLT

22 N-m (2.2 kgf-m, 16 Ibf-ft)
8 mm NUT

9 N-m (0.9 kgf-m, 7 Ibf-ft)

RUBBER MOUNT

BRACKETProCarManuals.com

Precharge Pum p Moto r
Removal/Installatio n
NOTE:
Do no t spil l brak e flui d o n th e vehicle ; i t ma y damag e th e paint ; i f brak e flui d doe s contac t th e paint , was h it of f imme -
diatel y wit h water .
Tak e car e no t t o damag e o r defor m th e brak e line s durin g remova l an d installation .
T o preven t th e brak e flui d fro m flowing , plu g an d cove r th e hos e end s an d joint s wit h a sho p towe l o r equivalen t material .
Remova l
1. Disconnec t th e precharg e pum p moto r 2 P connector .
2 . Disconnec t th e brak e lin e an d th e brak e hos e fro m th e precharg e pum p motor .
3 . Remov e th e thre e 6 m m bolt s fro m th e precharg e pum p motor , the n remov e th e precharg e pum p moto r wit h bracket .
4 . Remov e th e tw o 6 m m bolt s an d 8 m m nut , the n remov e th e precharg e pum p motor .
Installatio n
1. Instal l th e precharg e pum p moto r o n th e bracket , the n tighte n th e tw o 6 m m bolt s an d th e 8 m m nut .
2 . Instal l th e precharg e pum p moto r wit h bracket , the n tighte n th e thre e 6 m m bolts .
3 . Connec t th e brak e lin e an d th e brak e hos e o n th e precharg e pum p motor .
4 . Perfor m th e precharg e brak e lin e bleedin g (se e pag e 19-271 ).
5 . Blee d th e brak e system , startin g wit h th e fron t wheels .
6 . Star t th e engine , an d chec k tha t th e AB S indicato r goe s off .
7 . Test-driv e th e vehicle , an d chec k tha t th e AB S indicato r doe s no t com e on .
6 m m BOL T
9. 8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
BRAKE HOS E
8 m m NU T13 N- m (1. 3 kgf-m , 9. 4 Ibf-ft )
BRAKE LIN E
FLAR E NU T
1 5 N- m 11. 5 kgf-m , 1 1 Ibf-ft )
PRECHARG E PUM P MOTO R
RUBBE R MOUN T
MOUNTIN G BOL T
PRECHARG E PUM P MOTO R2P CONNECTO R
BRACKET
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