1995 ACURA TL engine

Modulator Uni t
Removal/Installatio n (cont'd )
Installation :
1 . Chec k whethe r th e brak e flui d leve l i n th e reservoi r
i s a t th e MA X (upper ) lever . I f leve l i s low , ad d fres h
brak e flui d t o th e MA X (upper ) level .
CAP
MA X (UPPER ) LEVE L
LIN E
2. Befor e installin g th e modulato r uni t o n th e car , b e
sur e t o blee d th e ai r fro m th e suctio n por t i n th e
modulato r uni t b y leanin g th e modulato r uni t t o on e
sid e slowl y (abou t 4 5 degrees ) a s shown .
RESERVOI R
SUCTION POR T
Abou t 4 5 degree s
MODULATO R UNI T
CAUTION : Whe n installin g th e modulato r unit , b e
carefu l no t t o tur n i t upside-dow n o r lea n i f exces -
sively.
3. Instal l th e modulato r uni t i n th e revers e orde r o f
removal .
NOTE : Chec k th e letter s stampe d o n th e modulato r
body , an d connec t th e brak e pipe s properly .
Tighte n th e flar e nut s t o 1 9 N- m (1. 9 kgf-m , 1 4 Ibf-ft) .
Connec t th e lin e Connec t th e lin e Connec t th e lin e
fro m th e right-rea r fro m th e left-rea r fro m th e right-fron t
whee l t o "RR" . whee l t o "RL" . whee l t o "FR" .
Connec t th e lin e
fro m th e left-fron t
wheel t o "FL" .
MODULATO R UNI T
Lin e fro m th e Lin e fro m th e
maste r cylinde r maste r cylinde r
secondar y sid e primar y sid e
4. Star t th e engine and le t i t idl e fo r a minute .
Chec k that :
ABS indicato r ligh t i s off .
Brak e flui d i s no t leakin g fro m th e brak e pip e
joints .
5. Sto p th e engine .
6 . Chec k whethe r th e brak e flui d leve l i n th e reservoi r
i s a t th e MA X (upper ) level . I f leve l i s low , ad d fres h
flui d unti l th e reservoi r i s refille d t o th e MA X (upper )
level.
7. Blee d ai r fro m th e brak e syste m (se e pag e 19-7 ).
8 . Chec k th e AB S functio n usin g th e AL B checke r (se e
pag e 19-112 ).
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3. Remov e th e modulato r uni t fro m th e ca r (se e pag e
19-117 ).
4 . Remov e th e accumulato r fro m th e modulato r unit .
MODULATO R UNI TRELIE F PLU G
ACCUMULATO RReplace.
9.8 N- m (1. 0 kgf-m , 7 Ibf-ft )
5. Remov e th e relie f plu g completely , an d dispos e o f
the accumulator .
6. Instal l th e ne w accumulato r o n th e modulato r unit .
7. Instal l th e modulato r uni t (se e pag e 19-118 ).
NOTE : Afte r installin g th e modulato r uni t an d bleed -
in g th e brakes , star t th e engine and mak e sur e tha t
th e AB S indicato r ligh t goe s off .
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

Modulator Unit

Removal/Installation

CAUTION:

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

immediately 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.

NOTE: Tighten the flare nuts to 15 N-m (1.5 kgf-m, 11 Ibf-ft).

Removal

1. Disconnect the modulator unit 10P and pump motor 2P connectors.

2. Remove the proportioning control valve.

3. Disconnect the brake lines, then remove the modulator unit.

Installation

1. Install the modulator unit, then connect the brake lines.

2. Install the proportioning control valve.

3. Connect the modulator unit 10P and pump motor 2P connectors.

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

5. Start the engine, and check that the ABS indicator light goes off.

6. Test-drive the vehicle, and check that the ABS indicator light does not come on.

MODULATOR UNIT

10P CONNECTOR
From right-front

From left-front

PUMP MOTOR

2P CONNECTOR

6 mm BOLT

9.8 N-m (1 .0 kgf-m, 7 Ibf-ft) PROPORTIONING

CONTROL

VALVE

6 mm NUT

9.8 N-m (1.0 kgf-m, 7 Ibf-ft)

BRACKET
RUBBER MOUNT

MODULATOR UNIT

8 mm BOLT

22 N-m (2.2 kgf-m, 16 Ibf-ft)ProCarManuals.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

YEL/BLK

YEL/WHT

YEL

LT

GRN/YEL

WHT/GRN
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

coolant temperature

below 207°F [97°C])
Corrective action if desired results are

not obtained

Repair open to body ground.

Check No. 39 (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. 8 (7.5 A) fuse in the under-

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

the YEL/BLK 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 k 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 con-

denser fan relay, or the YEL wire between

the radiator fan control module and the

radiator fan relay. If OK, test the con-

denser fan relay or the radiator fan relay.

Faulty engine coolant temperature (ECT)

switch B, short to body ground, or faulty

radiator fan control module.

* No.4 (15 A): '95 and '96 models

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

Heater Uni t
Replacemen t (cont'd )
7. Disconnec t th e connecto r fro m th e recirculatio n
contro l motor , the n remov e th e self-tappin g scre w
fro m th e pip e clamp .
PIPE CLAM P
RECIRCULATIO N CONTRO L MOTO R
8. Disconnec t th e connector s fro m th e powe r transis -
tor , blowe r moto r hig h relay , evaporato r tempera -
tur e sensor , blowe r moto r an d th e heate r sub-har -
ness , the n remov e th e heate r sub-harnes s connec -
to r fro m th e bracket .
BLOWER MOTO R HIG H RELA Y
BLOWE R MOTO R CONNECTO R
POWERTRANSISTO R
EVAPORATO RTEMPERATUR ESENSORCONNECTO R
HEATE R SUB-HARNES S
CONNECTO R
9. Remov e th e clip s fro m th e righ t an d lef t heate r
ducts , an d th e SR S mai n harnes s clip s fro m th e
heate r unit . Remov e th e thre e self-tappin g screws,
th e si x mountin g bolts , th e bracke t an d th e heate r
unit .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
HEATE R UNI T
HEATE R DUCT S
SRS MAI N HARNES S
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
10. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
Appl y sealan t t o th e grommets .
D o no t interchang e th e inle t an d outle t heate r
hoses . Mak e sur e tha t th e clamp s ar e secure .
Loose n th e blee d bol t o n th e engine , an d refil l
th e radiato r an d th e coolan t reservoi r wit h th e
prope r engin e coolan t mixtur e (se e sectio n 10 ).
Tighte n th e blee d bol t whe n al l th e trappe d ai r
ha s escape d an d engin e coolan t begin s t o flo w
fro m it (se e sectio n 10 ).
Mak e sur e tha t ther e is n o ai r leakage .
ProCarManuals.com

Troubleshooting

Tips and Precautions

Before Troubleshooting

Check applicable fuses in the appropriate fuse/relay

box.

Check the battery for damage, state of charge, and

clean and tight connections.

Check the alternator belt tension.

CAUTION:

Do not quick-charge a battery unless the battery

ground cable has been disconnected, otherwise you

will damage the alternator diodes.

Do not attempt to crank the engine with the battery

ground cable loosely connected or you will severely

damage the wiring.

Handling Connectors

Make sure the connectors are clean and have no loose

wire terminals.

Make sure multiple cavity connectors are packed with

grease (except waterproof connectors).

All connectors have push-down release type locks.

LOCKING TAB

Some connectors have a clip on their side used to

attach them to a mount bracket on the body or on

another component. This clip has a pull type lock.

Some mounted connectors cannot be disconnected

unless you first release the lock and remove the con-

nector from its mount bracket.

LOCKING

PAWL ON

OTHER

HALF OF

CONNECTOR
Pull to

disengage

BRACKET
Never try to disconnect connectors by pulling on

their wires; pull on the connector halves instead.

Always reinstall plastic covers.

Before connecting connectors, make sure the termi-

nals are in place and not bent.

BENT TERMINAL

Check for loose retainer and rubber seals.

RETAINER
RUBBER SEAL RETAINER

The backs of some connectors are packed with

grease. Add grease if necessary. If the grease is con-

taminated, replace it.
LOCKING TABProCarManuals.com

Relay and Control Unit Locations

Engine Compartment

UNDER-HOOD ABS

FUSE/RELAY BOX

ABS PUMP MOTOR RELAY

HEADLIGHT

RELAY
DIMMER RELAY
TAILLIGHT

RELAY
POWER WINDOW

RELAY
UNDER-HOOD

FUSE/RELAY BOXProCarManuals.com