1995 ACURA TL light

Troubleshooting Precautions

ABS Indicator Light:

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

initial 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 one 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 three seconds.

Self-diagnosis:

• There are three self-diagnosises 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

Kickback and Pump Operation:

• When the engine is started, the ABS control unit begins the initial diagnosis and operates the solenoid valve one time.

The kickback may be felt when the brake pedal is depressed.

• When the ABS control unit detects the pressure switch OFF signal during the initial diagnosis, it operates the pump

motor, and performs the pump motor over-run diagnosis and pump motor diagnosis. Therefore, there are two cases

where the pump motor operates or does not operate after the engine is started.

• Normally, after the initial diagnosis, the pump motor operates based on the pressure switch signal, regardless of the

vehicle speed.

Troubleshooting:

• When two or three DTCs are stored in the control unit, perform troubleshooting for the DTC that appears first.

• When a customer's reported problem cannot be verified on the car, ask the customer about the conditions when the

ABS indicator light came ON, and test-drive the car under those conditions, if possible. When the ABS indicator light

does not come ON during the test, check for loose terminals and check by shaking the harnesses and connectors while

following the flowchart.

• The connector terminal numbers are viewed from the wire side for the female terminals, and from the terminal side for

the male terminals.

• After the repair is completed, test-drive the car and check that the ABS indicator light does not come ON again during

the test. (Refer to the Symptom-to-System Chart for diagnostic period.)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 .
SCS SERVIC E CONNECTO R07PAZ-001010 0
SERVICE CHEC KCONNECTO R (2P )
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)

ABS

Indicator

light on

ABS

Indicator

light off
DTC:
4-2

Main Coda: 4

Sub-Code: 2

Connect the

SCS service

connector
2 Second Second

pause pause
5 Second

pause
1

Second

pause
5 Second

pause
1

Second

pause

2 Seconds

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

• The ABS control unit indicates the DTC three 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 three seconds to erase the ABS control

unit's memory.ProCarManuals.com

Diagnostic Troubleshootin g Cod e (DTC )
Symptom-to-Syste m Char t
ABS indicato r
ligh t doe s no t
com e o n whe n
ignitio n switc h
i s turne d O N III )
AB S indicato r
ligh t doe s no t
go of f afte rengin e is starte d(No DTC )
ABS pum p
moto r over-ru n
Pum p moto r
High-pressur eleakage
Pressur eswitch
High-pressur esystem
Parkin g brak e
O
O
O
O0
O
O
O
• Blow n BACK-U P LIGHTS/METE R LIGHT S (1 0 A ) fus e
• Ope n circui t betwee n th e BACK-U P LIGHTS/METE R LIGHT S (1 0 A ) fus e
an d AB S indicato r ligh t
• Blow n AB S indicato r ligh t bul b
• Ope n circui t betwee n th e AB S indicato r ligh t an d AB S contro l uni t
• Ope n circui t betwee n th e AB S contro l uni t an d bod y groun d
• Poo r bod y groun d
• Fault y AB S contro l uni t
• Blow n R/ C MIRROR/REA R DEFROSTE R RELA Y (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 lunit.• 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
unit• 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 i n th e WAR N circui t betwee n th e AB S indicato rlight an d AB S contro l uni t• Fault y AB S contro l uni t
• Ai r mixe d i n th e AB S brak e fluid .
• Pressur e switc h stuc k OF F
• Ope n circui t betwee n th e pressur e switc h an d AB S contro l uni t
• Ope n circui t i n th e P-S W circui t betwee n th e pressur e switc h an d bod y
ground , o r a poo r groun d
• Dro p in pum p discharg e volum e
• Leakin g outle t valv e
• Leakin g relie f valv e
• AB S brak e flui d leakag e
• Fault y AB S contro l uni t
• Ope n circui t o r shor t t o bod y groun d betwee n th e R/ C MIRROR/REA R
DEFROSTER RELA Y (7. 5 A ) fus e an d under-hoo d fuse/rela y bo x• Ope n circui t o r shor t t o bod y groun d i n th e PM R circui t insid e th e under -
hoo d fuse/rela y bo x
• Fault y pum p moto r rela y
• Ope n circui t o r shor t t o bod y groun d i n th e PM R circui t betwee n th e
under-hoo d 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 MOTO R (4 0 A ) fus e
• Blow n AB S UNI T (7. 5 A ) fus e
• Ope n circui t o r shor t t o bod y groun d i n th e moto r driv e circui t an d MC K
circui t insid e th e under-hoo d fuse/rela y bo x
• Ope n circui t o r shor t t o bod y groun d i n th e MC K circui t betwee n th e
under-hoo d fuse/rela y bo x an d AB S contro l uni t• Ope n circui t o r shor t t o bod y groun d betwee n th e under-hoo d fuse/rela y
bo x an d pum p moto r
• Fault y pum p moto r
• Ope n circui t betwee n th e pum p moto r an d bod y groun d o r poo r groun d
• Fault y AB S contro l uni t
• Leakin g outle t valv e
• Leakin g relie f valv e
• Poo r contac t i n pressur e switc h circui t
• Shor t t o bod y groun d betwee n th e AB S contro l uni t an d pressur e switc h
• Pressure switch stuc k O N
• Fault y AB S contro l uni t
• Accumulato r ga s leakag e
• Change d relie f valv e se t pressur e
• Rea r outle t solenoi d valv e lat e t o clos e
• Change d pressur e switc h se t pressur e
• Lo w flui d leve l i n th e maste r cylinde r reservoi r
• Ope n circui t betwee n th e BACK-U P LIGHTS/METE R LIGHT S (1 0 A ) fus e
an d brak e syste m ligh t
• 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 dleve l switc h
• Fault y AB S contro l uni t
• Intermitten t interruptio n in th e MC Kcircui t• Intermitten t interruptio n in th e pum pmotor rela y driv e circui t• Intermitten t interruptio n i n th e pum pmotor driv e circui t
• Intermitten t interruptio n i n th e pressur e switc h• Intermitten t interruptio n i n th e pressur eswitch circui t
• Th e AB S indicato r ligh t ma ynot com e o n i n norma l climat e whe n i t
come s o n i n ver y col d climate .
• Drivin g wit h th e parkin g brak e
applie d — (No problem ) •
Th e AB S indicato r ligh t i s turne d o n whe n th e pum p moto r rela y O N signa l i s detect -
e d fo r mor e tha n 4 0 second s whil e th e AB S i s no t functioning .
• Th e AB S indicato r ligh t i s turne d o n whe n batter y voltag e is detecte d a t th e MC Ktermina l whil e th e pum p moto r rela y OF F signa l i s detected .• Th e AB S indicato r ligh t i s turne d o n whe n th e 0 V is detecte d a t th e MC K termina lwhile th e pum p moto r rela y O N signa l i s detected .
• Th e AB S indicato r ligh t i s turne d o n whe n th e frequen t ON/OF F cycl e o f th e pressur e
switc h signa l i s detecte d whil e th e engin e i s running . Th e coun t i s erase d whe n th e
AB S functions .
• Th e AB S indicato r ligh t i s turne d o n whe n th e pressur e switc h O N signa l i s alway s
detecte d a t ever y initia l diagnosis .
Th e coun t i s erase d whe n th e AB S contro l uni t detect s th e pressur e switc h OF F signal .
• Thi s diagnosi s i s performe d whe n th e pressur e switc h i s OF F a t th e initia l diagnosis .
Th e pum p moto r i s operate d t o tur n th e pressur e switc h ON , the n th e solenoi d valv e
i s momentaril y activated . Th e AB S indicato r ligh t i s turne d o n i f th e pressur e switc h
signa l change s fro m O N to OFF .
• Th e AB S indicato r ligh t i s turne d o n whe n th e parkin g brak e O N signa l i s detecte d fo r
mor e tha n 3 0 second s whil e driving .
19-16
19-1 8
19-2 1
19-2 3
19-2 9
19-3 1
19-3 2
19-3 3
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ABS Functio n Tes t
1. Rais e th e ca r of f th e ground , an d suppor t i t wit h safet y
stands .
2. Chec k tha t ther e is n o brak e drag .
3 . Tur n th e ignitio n switc h O N (II) , an d confir m tha t th e
AB S indicato r ligh t come s on .
• I f th e AB S indicato r ligh t doe s no t com e on , follo w
th e troubleshootin g o n pag e 19-16 .
4 . Hond a PG M Tester : Connec t th e PG M Teste r a s
describe d i n th e PG M Teste r Anti-Loc k Brak e
Syste m (ABS ) Vehicl e Syste m Supplement . Follo w
th e tester' s prompt s instea d o f step s 5 throug h 1 1
o f thi s procedure .
AL B Checker : Wit h th e ignitio n switc h OFF , discon -
nec t th e AB S inspectio n connecto r (6P ) fro m th e
connecto r cove r locate d unde r th e glov e box , an d
connec t i t t o th e AL B checker . Continu e wit h step s 5
throug h 1 1 o f thi s procedure .
ALB CHECKE R07HAJ-SG0010 B
ABS
INSPECTIO NCONNECTO R (6P )
5. Shif t th e transmissio n t o position .
6 . Star t th e engin e an d releas e th e parkin g brake . 7
. Tur n th e Mod e Selecto r switc h t o "1" .
Monito r Light s
Powe r O NStar t Tes t
8. Pus h th e Star t Tes t switch .
Th e AB S indicato r ligh t shoul d no t com e o n whil e
th e Tes t i n Progres s ligh t i s on .
• I f th e AB S indicato r ligh t come s on , confir m th e
DT C an d perfor m th e appropriat e troubleshootin g
fo r th e code .
NOTE : D o no t tur n th e Mod e Selecto r switc h whe n
th e Tes t i n Progres s ligh t i s on . Damag e to th e AL B
checke r ca n result .
9 . Tur n th e Mod e Selecto r switc h t o "2" .
10 . Depres s th e brak e peda l firmly , an d pus h th e Star t
Test switch . Th e AB S indicato r ligh t shoul d no t com e
on whil e th e Tes t i n Progres s ligh t i s on . Ther e
shoul d b e kickbac k o n th e brak e pedal .
Hav e th e assistan t chec k tha t th e whee l controlle d b y
th e AB S ca n b e rotate d b y han d whe n ther e is kick -
back o n th e brak e pedal .
• I f th e AB S indicato r ligh t come s on , confir m th e
DT C an d perfor m th e appropriat e troubleshoot -
ing fo r th e code .
• I f th e AB S indicato r ligh t doe s no t com e o n an d
th e whee l controlle d b y th e AB S canno t b e rotat -
ed , chec k th e connectio n o f th e modulato r wir e
harnes s connectors . I f th e connection s ar e OK ,
replac e th e modulato r unit .
NOTE : Th e kickbac k shoul d occu r approximatel y 2 0
second s afte r th e Star t Tes t switc h i s pushed .
Th e AB S can be checke d wit h a brak e tester , too , b y
checkin g th e brak e torqu e fluctuatio n o f th e whee l
controlle d b y th e ABS .
11 . Tur n th e Mod e Selecto r switc h t o "3" , "4 " an d "5" .
Perfor m ste p 1 0 fo r eac h o f th e tes t mod e positions .
Mode Selecto r
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GAUGE ASSEMBL YUNDER-HOO D FUSE/RELA Y BO X
AB S INDICATO R LIGH T
UNDER-DAS H FUSE/RELA Y BO X
R/ C MIRROR /
REAR DEFROSTE RRELAY (7. 5 A ) FUS E
BACK-U P LIGHTS /
METE R LIGHT S
(1 0 A ) FUS E AB
S
UNI T(7.5 A ) FUS ESTOP/HOR
N
(2 0 A ) FUS E
BATTER Y(120 A ) FUS E
AB S B 1 (2 0 A ) FUS E AB
S MOTO R (4 0 A ) FUS E
I G S W (5 0 A ) FUS E
UNDER-DAS H RELA Y BO X
FAIL-SAF E RELA Y
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Troubleshooting Precautions

ABS Indicator Light

1. If the system is OK, the ABS indicator light goes off two seconds after turning the ignition switch ON (II) without start-

ing the engine. After starting the engine, the ABS indicator light comes on again and goes off after two seconds. This

occurs because the ABS control unit is activated by the IG2 power source.

2. The ABS indicator light comes on when the ABS control unit detects a problem in the system. However, even though

the system is normal, the ABS indicator light comes on, too, under the following conditions. To determine the actual

cause of problem, question the customer about the problem, talking the following conditions into consideration.

Only drive wheels rotate

One wheel stuck of drive wheels

Vehicle spin

ABS operate condition continue for long time

Signal disturbance

3. When a problem is detected and the ABS indicator light comes on, there are cases when the indicator light stays on

until the ignition switch is turned OFF, and cases when the indicator light goes off automatically when the system

returns normal. For the DTC 61 and 62, the indicator light goes off automatically when the system returns normal. For

all other codes, the indicator light stays on until the ignition switch is turned OFF.

4. For DTCs 12, 14, 16, 18, 21, 22, 23, 24, 51, 52 and 53, the indicator light goes off when the vehicle is driven again and

the signals are OK after the ignition switch is turned from OFF to ON (II). However, if the DTC is erased, the CPU is

reset and the indicator light goes off right after the engine is started if the signals are OK.

Diagnostic Trouble Code (DTC)

1. The DTC is not memorized if the CPU cannot be activated or the CPU fails and the indicator light comes on.

2. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the later one

is written over the old one. Therefore, when the same problem is detected repeatedly, it is memorized as one DTC.

3. The DTCs are indicated in the order of ascending number, not in the order they occur.

4. The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs cannot be canceled

by disconnecting the battery. Perform the specified procedures to erase the DTCs.

Self-diagnosis

1. The
self-diagnosis
can be
classified
into
two
categories.

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

• Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.

2. When a problem is detected by self-diagnosis, the system

• Turns the ABS indicator light ON

• Memorizes the DTC

• Turns the fail-safe relay OFF

• Stops ABS controlProCarManuals.com