check engine ACURA RL KA9 1996 Service Workshop Manual
[x] Cancel search | Manufacturer: ACURA, Model Year: 1996, Model line: RL KA9, Model: ACURA RL KA9 1996Pages: 1954, PDF Size: 61.44 MB
Page 1051 of 1954
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
Page 1084 of 1954
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
Page 1087 of 1954
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
Page 1091 of 1954
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
ProCarManuals.com
Page 1093 of 1954
(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 .
ProCarManuals.com
Page 1098 of 1954
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
ProCarManuals.com
Page 1121 of 1954
(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
ProCarManuals.com
Page 1122 of 1954
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 .
ProCarManuals.com
Page 1126 of 1954
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 .
ProCarManuals.com
Page 1132 of 1954
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 .
ProCarManuals.com