engine ACURA RL KA9 1996 Service Repair Manual

Inspection and Adjustment

Brake Pedal

Pedal Height

1. Disconnect the brake pedal position switch connec-

tor, loosen the brake pedal position switch locknut,

and back off the brake pedal position switch

until it is no longer touching the brake pedal.

2.

Lift up the carpet. At the insulator cutout, measure

the pedal height from the middle of the right side of

the pedal pad.

PUSHROD

LOCKNUT
BRAKE PEDAL POSITION SWITCH

BRAKE PEDAL POSITION SWITCH

LOCKNUT

INSULATOR

(CUTOUT)

MEASURING POINT

Standard Pedal Height (with carpet removed):

182 mm (7
3/16
in)

3. Loosen the pushrod locknut, and screw the pushrod

in or out with pliers until the standard pedal height

from the floor is reached. After adjustment, tighten

the locknut firmly.

NOTE: Do not adjust the pedal height with the

pushrod pressed.

Lower the pedal

PUSHROD LOCKNUT

15 N-m

(1.5 kgf-m, 11 Ibf-ft)
4.
Screw in the brake pedal position switch until its

plunger is fully pressed (threaded end touching the

pad on the pedal arm). Then back off the switch 1/4

turn to make 0.3 mm (0.01 in) of clearance between

the threaded end and pad. Tighten the locknut firm-

ly. Connect the brake pedal position switch connec-

tor.

CAUTION: Make sure the brake lights go off when

the pedal is released.

PAD

5. Check the brake pedal free play as described below.

Pedal Free Play

1. With the engine off, check the play on the pedal pad

by pushing the pedal by hand.

Free Play: 0.5 - 2.0 mm (0.02 - 0.08 in)

2. If the pedal free play is out of specification, adjust

the brake pedal position switch.

CAUTION: If the pedal free play is insufficient, it

may result in brake drag.

BRAKE PEDAL POSITION SWITCH

BRAKE PEDAL PAD

PEDAL FREE PLAY
LOCKNUT
THREADED

END

0.3 mm

(0.01
in)
BRAKE PEDAL PAD

PEDAL HEIGHT

Raise

the pedalProCarManuals.com

Master Cylinder/Brak e Booste r
Brake Booste r Inspectio n
Functiona l Tes t
1 . Wit h th e engin e stopped , pres s th e brak e peda l sev -
eral time s t o deplet e th e vacuu m reservoir , the n
pres s th e peda l har d an d hol d i t fo r 1 5 seconds . I f
th e peda l sinks , eithe r th e maste r cylinde r i s
bypassin g internally , o r th e brak e syste m (maste r
cylinder , lines , modulator , o r caliper ) i s leaking .
2 . Star t th e engin e wit h th e peda l pressed . I f th e peda l
sinks slightly , th e vacuu m booste r i s operatin g nor -
mally . I f th e peda l heigh t doe s no t vary , th e booste r
o r chec k valv e is faulty .
3. Wit h th e engin e running , pres s th e brak e peda l light -
ly. Appl y jus t enoug h pressur e t o hol d bac k auto -
mati c transmissio n creep . I f th e brak e peda l sink s
mor e tha n 2 5 m m (1. 0 in. ) i n 3 minutes , th e maste r
cylinde r i s faulty . A sligh t chang e i n peda l heigh t
whe n th e A/ C compresso r cycle s o n an d of f i s nor -
mal . (Th e A/ C compresso r loa d change s th e vacuu m
availabl e to th e booster. )
Leak Tes t
1 . Pres s th e brak e peda l wit h th e engin e running , the n
sto p th e engine . I f th e peda l heigh t doe s no t var y
whil e presse d fo r 3 0 seconds , th e vacuu m booste r i s
OK . I f th e peda l rises , th e booste r i s faulty .
2 . Wit h th e engin e stopped , pres s th e brak e peda l sev -
era l time s usin g norma l pressure . Whe n th e peda l i s
firs t pressed , i t shoul d b e low . O n consecutiv e appli -
cations , th e peda l heigh t shoul d graduall y rise . I f th e
peda l positio n doe s no t vary , chec k th e booste r
chec k valve .
Booste r Chec k Valv e Tes t
1 . Disconnec t th e brak e booste r vacuu m hos e a t th e
booster .
2 . Star t th e engine , an d le t i t idle . Ther e shoul d b e vac -
uum . I f n o vacuu m is available , th e chec k valv e i s
no t workin g properly . Replac e th e brak e booste r
vacuu m hos e an d chec k valve , an d retest .
NOTE : '9 6 - 9 7 model s shown .
BRAKE BOOSTE RVACUUM HOS E
(Chec k valv e is
built-in )
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Troubleshooting Precautions

ABS Indicator Light:

The ABS indicator light comes on for 3 seconds and then goes off when the control unit detects no problem during the ini-

tial diagnosis right after the engine starts. However, the ABS indicator light can stay on for up to 40 seconds when the

control unit starts to check for pump overrun, etc. during the initial diagnosis. The ABS indicator light comes on, and the

ABS control unit memorizes the diagnostic trouble code (DTC) under certain conditions.

The parking brake is applied for more than 30 seconds while the vehicle is being driven. (DTC 2-1)

The transmission downshifted excessively. (DTC 4-1, 4-2)

The vehicle loses traction, and the front wheels spin for more than 1 minute when starting from a stuck condition on a

muddy, snowy, or sandy road. (DTC 4-8)

Tire adhesion is lost due to excessive cornering speed. (DTC 5, 5-4, 5-8)

The vehicle is driven on an extremely rough road. (DTC 8-1)

The vehicle is interfered by strong radio waves (noise), for example, illegal radio, etc. (DTC 8-2)

NOTE: If there is any trouble in the system, the ABS indicator light comes on during driving.

Diagnostic Trouble Code (DTC):

When the control unit detects a problem and the ABS indicator light comes on, the control unit memorizes the DTC.

The control unit has three memory registers. When a problem occurs, the control unit stores the DTC in the first memory

register. If another problem occurs, or the same problem occurs again, the control unit moves the first DTC to the next

memory register, and stores the second DTC in the first register. If there's a third problem occurrence, the two existing

DTCs are moved up one register, and the third DTC is stored in the first register. If problems continue to occur, the oldest

problem is moved out of the last register and lost, and the most recent problem is stored in the first register. When the

same problem occurs three times, the same DTC is stored in all memory registers. (Refer to the Symptom-to-System

Chart for diagnostic period.)

The most recent DTC is indicated first, and the oldest DTC is indicated last.

The DTCs are erased from the control unit when the ABS control unit +B2 power supply or connector is disconnected.

The control unit's memory can be erased by disconnecting the ABS B2 fuse for more than 3 seconds.

Self-diagnosis:

There are three self-diagnoses described below.

Initial diagnosis: Performed right after the engine starts until the ABS indicator light goes off.

Regular diagnosis: Continuously performed (under some conditions) after the ABS indicator light goes off until the

engine stops.

Individual part/system diagnosis: Diagnosis about a specific part/system under its operating conditions.

The CPU (central processing unit) controls the following when it detects a problem during self-diagnosis:

Turns the ABS indicator light ON.

Turns the front and rear fail-safe relays off.

Stops the ABS control.

Stops the ABS pump. (The pump may work under some conditions.)

After the DTC is stored in the control unit, the CPU stops self-diagnosis.ProCarManuals.com

Diagnostic Troubl e Cod e (DTC ) Indicatio n
1. Connec t th e SC S servic e connecto r t o th e servic e chec k connecto r unde r th e glov e box .
SERVIC E CHEC KCONNECTO R (2P )
SCS SERVIC E CONNECTO R07PAZ-001010 0
2. Tur n th e ignitio n switc h O N (II) , bu t d o no t star t th e engine .
3. Recor d th e blinkin g frequenc y o f th e AB S indicato r light . Th e blinkin g frequenc y indicate s th e diagnosti c troubl e cod e
(DTC) .
NOTE : Chec k th e DT C carefull y an d recor d it . Th e memor y o f th e DT C is erase d if th e connecto r i s disconnecte d fro m
the AB S contro l unit .
GAUG E ASSEMBL Y
ABS INDICATO R LIGH T
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DTC Indication Pattern (When the ABS control unit detected a problem three times.):

Turn the ignition switch ON (II). The ABS indicator light comes on for 2 seconds to check the bulb.

The ABS control unit indicates the DTC 3 times.

If you miscount the blinking frequency or if you recheck the blinking frequency, turn the ignition switch OFF then

turn it ON (II) to cycle the ABS indicator light again.

4. Remove the SCS service connector.

NOTE: The Malfunction Indicator Lamp (MIL) will stay on after the engine is started if the SCS service connector is

connected.

5. Remove the ABS B2 (15 A) fuse in the under-hood fuse/relay box for at least 3 seconds to erase the ABS control unit's

memory.ProCarManuals.com

ABS Indicato r Ligh t Doe s No t G o Of f (N o DTC )
The AB S indicato r ligh t doe s no t g o of f afte r th e engine is starte d
Whe n n o proble m is foun d durin g th e initia l diagnosis , th e AB S contro l uni t turn s th e AB S indicato r ligh t driv e transisto r
of f t o tur n th e AB S indicato r ligh t off .
Possibl e cause s fo r a n AB S indicato r ligh t tha t doe s no t g o off , bu t n o Diagnosti c Troubl e Cod e (DTC ) i s indicated :
Blow n R/ C MIRRO R (7. 5 A ) fus e
Ope n circui t betwee n th e under-das h fuse/rela y bo x an d AB S contro l uni t
Ope n circui t betwee n th e batter y an d under-hoo d fuse/rela y bo x
Blow n AB S B 2 (1 5 A ) fus e
Ope n circui t insid e th e under-hoo d fuse/rela y bo x
Ope n circui t betwee n th e under-hoo d fuse/rela y bo x an d AB S contro l uni t
Fault y alternato r
Ope n circui t betwee n th e alternato r an d AB S contro l uni t
Shor t t o bod y groun d in th e WAR N circui t betwee n th e AB S indicator light an d AB S contro l uni t
Fault y AB S contro l uni t
Wit h engin e running , AB Sindicato r ligh t i s ON .With th e SC S servic e connec -
to r connecte d (se e pag e 19-40 ),
n o DT C is indicated .
Chec k th e chargin g system :
Star t th e engin e an d chec k th e
chargin g syste m indicato r light .
Does i t g o off ?
Chec k th e IG 2 powe r sourc e fuse :
1. Tur n th e ignitio n switc h OFF .2. Chec k th e R/ C MIRRO R (7. 5 A )
fus e i n th e under-das h fuse /
rela y box .
I s th e fus e OK ?
Chec k th e AB S B 2 (1 5 A ) fus e i n
th e under-hoo d fuse/rela y box .
I s th e fus e OK ?
(T o pag e 19-46 ) Chec
k th e chargin g syste m (se e
sectio n 4) .
Replac e th e fus e an d recheck . UNDER-HOO
D FUSE/RELA Y BO X
NOTE : Reinstal l th e fus e i f i t i s OK .
Replac e th e fus e an d recheck .
NOTE : Reinstal l th e fus e i f i t i s OK .
ABS B 2 (1 5 A ) FUS E
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(From pag e 19-46 )
Chec k fo r a n ope n in th e IG 2 cir -
cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 22 P connecto r
termina l No . 1 1 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e CH G cir -
cuit :
1 . Star t th e engine .
2 . Measur e th e voltag e betwee n
the AB S contro l uni t 26 P con -necto r termina l No . 5 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 R/ C MIRRO R (7. 5 A ) fus e i n
th e under-das h fuse/rela y bo x
an d AB S contro l unit . AB
S CONTRO L UNI T 22 P CONNECTO R
Wir e sid e o f femal e terminal s
ABS CONTRO L UNI T 26 P CONNECTO R
Repair ope n i n th e wir e betwee n
th e alternato r an d AB S contro l
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 .
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Troubleshooting
DTC 1-2 : Pum p Moto r (cont'd )
(From pag e 19-51 )
Chec k fo r a n ope n in th e IG 2 cir -
cuit :
Measur e th e voltag e betwee n th e
under-hoo d fuse/rela y bo x 5 P
connecto r termina l No . 2 an dbody ground .
Is ther e batter y voltage ?
Chec k th e AB S pum p moto r rela y
operation :
1 . Connec t th e under-hoo d fuse /
rela y bo x 3 P connector.
2 . Instal l th e AB S pum p moto r
relay .
Doe s th e AB S pum p moto r
rela y operate ?
Chec k fo r a n ope n i n th e under -
hoo d fuse/rela y box :
Measur e th e voltag e betwee n th e
under-hoo d fuse/rela y bo x 5 P
connecto r termina l No . 1 an d
bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e PM R cir -
cuit :
Measur e th e voltag e betwee n th e
AB S contro l uni t 22 P connecto r
termina l No . 2 1 an d bod y ground .
I s ther e batter y voltage ?
Reconnec t th e connector s prop -
erly , reliev e syste m pressur e an d
star t th e engine . I f DT C 1- 2 i s
store d again , replac e th e AB S
contro l unit . NOTE
: 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 .
UNDER-HOO D FUSE/RELA Y BO X5P CONNECTO R
Repair ope n in th e wir e betwee n
th e R/ C MIRRO R (7. 5 A ) fus e in th e
under-das h fuse/rela y bo x an d th e
under-hoo d fuse/rela y box . Wir
e sid e o f femal e terminal s
(T o pag e 19-55 )
T o chec k fo r a shor t t o bod y groun d
i n th e AB S pum p moto r rela y coi l cir -
cuit
NOTE : Th e AB S pum p moto r rela y coi l circui t
i s checke d fo r a n ope n beginnin g wit h thi s
step .
UNDER-HOO D FUSE/RELA Y BO X
5 P CONNECTO R
Replace th e under-hoo d fuse /
rela y box .
(Ope n circui t insid e th e box ) Wir
e sid e o f femal e terminal s
AB S CONTRO L UNI T 22 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e under-hoo d fuse/rela y bo x
an d AB S contro l unit .
NOTE : Ad d brak e flui d i f th e flui d leve l i s
lowe r tha n th e MI N line . Wir
e sid e o f femal e terminal s
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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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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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