1995 ACURA TL relay

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 (cont'd )
Right-front
Left-fron t
Right -rear
Left -rear
Right -front
Left -
fron t
Right -rear
Left -rear
Right /Left
Righ t
Left
Front /rear
Fron t
Rear
Right -front
Left -
fron t
Rea r
• Chippe d pulse r gea r
• Improperl y installe d whee l senso r
• Differen t diamete r tir e installe d
• Ope n circuit , interna l shor t o r shor t t o bod y groun d i n th e whee l
sensor• Ope n circui t o r shor t t o bod y groun d i n th e positiv e ( + ) wir e be -
twee n th e whee l senso r an d AB S contro l uni t
• Ope n circui t o r shor t t o bod y groun d i n th e negativ e ( - ) wir e be -
twee n th e whee l senso r an d AB S contro l uni t
whee l senso r an d AB S contro l uni t
• Loos e connecto r o r poo r contac t o f terminal s
• Imprope r whee l senso r ai r ga p
• Fault y AB S contro l uni t
• Missin g pulse r
• Modulato r doe s no t decreas e pressur e properl y
• Ope n circuit , interna l shor t o r shor t t o bod y groun d i n th e whee l
senso r syste m
• Rea r brak e dra g• Modulato r doe s no t decreas e pressur e properl y
• Fault y AB S contro l uni t
• Shor t t o powe r i n th e rela y driv e circui t betwee n th e fail-saf e rela y
an d AB S contro l uni t
• Fault y rela y driv e transisto r (ON ) i n th e AB S contro l uni t
• Fail-saf e rela y stuc k O N
• Shor t t o powe r i n th e solenoi d driv e circuits betwee n th e fail-saf e
rela y an d AB S contro l uni t
• Fail-saf e rela y stuc k OF F
• Ope n circui t i n th e solenoi d driv e circui t betwee n th e under-hoo d
fuse/rela y bo x an d AB S contro l uni t
• Shor t t o bod y groun d i n th e solenoi d driv e circui t betwee n th e
solenoi d an d AB S contro l uni t
• Fault y solenoi d driv e transisto r (ON ) i n th e AB S contro l uni t
• Shor t t o powe r i n th e solenoi d driv e circui t betwee n th e solenoi d
an d AB S contro l uni t
• Fault y solenoi d driv e transisto r (OFF ) i n th e AB S contro l uni t
• Shor t t o powe r i n th e driv e circui t insid e th e solenoi d
• Shor t t o th e 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
• Whee l senso r signa l disappear s a t speed s o f 6 mp h (1 0 km/h ) o r les s
• Fault y AB S contro l uni t
• Faulty ABS contro l uni t
• Fault y AB S contro l uni t
• Intermitten t interruptio n i n th e whee lsensor
• (N o problem )
• Intermitten t interruptio n i n th e whee l
sensor• Whee l spi n o f bot h fron t wheel s (onl y
fo r DT C 4-8 ) — (No problem )
• Th e transmissio n downshifte d
excessivel y (onl y fo r DT C 4- 1 an d
4-2 ) -(N o problem )
• Intermitten t interruptio n i n th e whee l
sensor• Whee l spi n b y operatin g th e parkin g
brak e whil e th e parkin g brak e switc h
i s stuc k OF F
• Ca r spun-out — (N o problem )
• Intermitten t interruptio n i n th e sole -
noi d valv e driv e circui t
• Intermitten t interruptio n i n th e sole -
noi d valv e groun d circui t
• Intermitten t interruptio n i n th e fail -
saf e rela y circui t
• Intermitten t interruptio n i n th e whee l
sensor• Roug h roa d drivin g — (N o problem )
• (N o problem )
• (N o problem ) •
Th e AB S indicato r ligh t i s turne d o n whe n th e whee l senso r signa l i s periodicall y
missin g durin g driving .
• Th e AB S indicato r ligh t ma y b e turne d o n whil e drivin g whe n one , tw o o r thre e
differen t diamete r tire s ar e installed .
Thi s diagnosi s i s no t performe d whe n th e parkin g brak e switc h i s ON .
• Th e AB S indicato r ligh t i s turne d o n whe n th e whee l senso r signa l i s missin g a t
speed s o f 6 mp h (1 0 km/h ) o r more .
Thi s diagnosi s i s no t performe d whe n th e parkin g brak e switc h i s ON .
• Th e AB S indicato r ligh t i s turne d o n whe n eithe r o r bot h rea r wheel s loc k an d
th e whee l senso r signa l i s missin g durin g driving .
Thi s diagnosi s i s no t performe d whe n th e parkin g brak e switc h i s ON .
• Th e AB S indicato r ligh t i s turne d o n whe n batter y voltag e i s detecte d a t th e
solenoi d termina l befor e th e fail-saf e relay s ar e turne d o n a t th e initia l diagnosis .
• Eac h solenoi d valv e i s momentaril y activate d a t th e initia l diagnosi s an d whe n
th e ca r start s off . Th e AB S indicato r ligh t i s turne d o n whe n batter y voltag e i s
detecte d a t th e solenoi d terminal .
• Th e AB S indicato r ligh t i s turne d o n whe n 0 V is detecte d a t th e solenoi d termi -nal whil e th e solenoi d OF F signa l i s detecte d a t th e regula r diagnosis .
• Th e AB S indicato r ligh t i s turne d o n whe n th e AB S function s continuously .
• Th e AB S indicato r ligh t i s turne d o n whe n ther e i s a differenc e betwee n th e
CP U data .
• Th e AB S indicato r ligh t i s turne d o n whe n ther e i s a abnormalit y i n th e I C a t th e
regula r diagnosis .
19-37
19-3 7
19-3 8
19-4 1
19-4 2
19-4 4
19-4 7
19-4 9
19-5 3
19-5 9
19-6 6
19-6 7
19-6 7
ProCarManuals.com

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
ProCarManuals.com

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

Troubleshooting

Radiator Fan Control Module Input Tests

NOTE: Perform the following tests with the radiator fan control module 8P connector connected, the ignition switch ON (II),

and the A/C switch OFF. If you find the cause of a problem, correct it before you continue.

RADIATOR FAN CONTROL MODULE 8P CONNECTOR

WIRE SIDE OF FEMALE TERMINALS

Terminal

No.

4

6

7

2

3

1

8

5
Wire

color

BLK

WHT/GRN

BLK/YEL

BLK/YEL

YEL/WHT

YEL

LT

GRN/YEL

ORN
Test condition

Check for voltage to body

ground.

Check for battery voltage:

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Connect to body ground:

Ignition switch - ON (II)

Check for voltage.
Desired results

There should be less

than one volt.

There should be battery

voltage.

Condenser fan and radia-

tor fan should come on.

Approx. 11 V (engine oil

temperature below 198°F

[92°C])
Corrective action if desired results are

not obtained

Repair open to body ground.

Check No. 56 (10 A) fuse in the under-

hood fuse/relay box; if OK, repair open

in the WHT/GRN wire.

Check No. 4* fuse in the under-dash

fuse/relay box; if OK, repair open in the

BLK/YEL wire.

Check No. 7 (7.5 A) fuse in the under-

dash fuse/relay box; if OK, repair open in

the BLK/YEL wire.

Replace the radiator fan control module.

Before you connect the new radiator fan

control module, disconnect both fan

relays. Check for continuity between the

YEL/WHT (or YEL) wire and ground, using

the 20 scale on your ohmmeter. There

should be no continuity. If there is conti-

nuity, the new radiator fan control mod-

ule will be damaged when you connect it.

Check for an open in the LT GRN/YEL

wire between the radiator fan control

module and the condenser fan relay or

the radiator fan relay. If OK, check for an

open in the YEL/WHT wire between the

radiator fan control module and the radi-

ator fan relay, or the YEL wire between

the radiator fan control module and the

condenser fan relay. If OK, test the con-

denser fan relay or the radiator fan relay.

Faulty engine oil temperature switch,

short to body ground, or faulty radiator

fan control module.

*No. 4 (15 A):'96 model

No. 4 (20 A): '97 and '98 modelsProCarManuals.com

Relay an d Contro l Uni t Location s
Engine Compartmen t
ProCarManuals.com

Relay an d Contro l Uni t Location s
Engine Compartmen t (cont'd )
ProCarManuals.com

Relay an d Contro l Uni t Location s
Dashboar d (cont'd )
ProCarManuals.com