lights ACURA TL 1995 Service Repair Manual

Powertrain Control Module (PCM)

NOTE: If this symptom is intermittent, check for a loose fuse No. 1 (BACK UP

LIGHTS, METER LIGHTS, 10 A) in the under-dash fuse/relay box, a poor con-

nection at PCM terminal A7, or an intermittent open in the GRN/RED wire

between the PCM (A7) and the gauge assembly.

Is the low oil pressure light on?

Try to start the engine.

Does the engine start?

Check for an open in the wire or

bulb (MIL line):

1. Turn the ignition switch OFF.

2. Connect the PCM connector ter-

minal A7 to body ground with a

jumper wire.

3. Turn the ignition switch ON (II).

Is the MIL on?

Substitute a known-good PCM,

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
— Repair short or open in the

wire between NO. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10

A) fuse and gauge assembly.

— Replace No. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10 A)

fuse.

PCM CONNECTOR A (26P)

Check for an open in the wires

(PG1, PG2 lines):

1. Turn the ignition switch ON (II).

2. Measure voltage between

body ground and PCM con-

nector terminals A12 and A25

individually.
Wire side of female terminals

Is there less than 1.0 V?
Repair open in the wire(s)

between PCM and G101 (located

at intake manifold) that had

more than 1.0 V.

PCM CONNECTOR A (26P)

JUMPER WIRE

Wire side of female terminals
Repair open in the wires

between PCM (A7) and gauge

assembly.

Replace the MIL bulb.
Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
Turn the ignition switch ON (II).
The Malfunction Indicator Lamp

(MIL) never comes on (even for

two seconds) after ignition is

turned on (II).ProCarManuals.com

Idle Contro l Syste m
Idle Spee d Settin g
Inspection/Adjustmen t
NOTE:
Before settin g th e idl e speed , chec k th e followin g
items :
— Th e MI L ha s no t bee n reporte d on .
— Ignitio n timin g
— Spar k plug s
— Ai r cleane r (ACL )
— PC V syste m
(Canada ) Pul l th e parkin g brak e leve r up . Star t th e
engine , the n chec k tha t th e headlight s ar e off .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (transmissio n i n o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Connec t a OBDI I sca n too l (se e pag e 11-32 ) o r
tachometer .
• Connec t a tachomete r t o th e ignitio n contro l
module (ICM ) secondary , or.. .
TACHOMETE R
ICM
Remov e th e rubbe r ca p fro m th e tachomete r
connecto r an d connec t a tachometer .
TACHOMETE R TACHOMETE R
CONNECTOR
RUBBERCAP
3. Disconnec t th e IA C valv e connector .
4.
5 .
IA C VALV E
Start th e engin e wit h th e accelerato r peda l slightl y
depressed . Stabiliz e th e rp m a t 1,000 , the n slowl y
releas e th e peda l unti l th e engin e idles .
Check idlin g in no-loa d conditions : headlights , blow -
er fan , rea r defogger , radiato r fan , an d ai r conditione r
ar e no t operating .
Idl e spee d shoul d be :
480 5 0 rp m
(in o r position )
Adjus t th e idl e speed , i f necessary , b y turnin g th e
idl e adjustin g screw .
NOTE : Afte r adjustin g th e idl e spee d i n thi s step ,
rechec k th e ignitio n timin g (se e sectio n 23 ).
I f i t i s ou t o f spec , g o bac k t o ste p 4 .
IDL E ADJUSTIN G SCRE W
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19. Turn the ignition switch ON (II). Move the shift lever

through all gears, and check the A/T gear position

switch synchronization with the A/T gear position

indicator.

GAUGE ASSEMBLY

20. If the A/T gear position switch is not synchronized

with the A/T gear position indicator, loosen the bolts

securing the A/T gear position switch and adjust the

A/T gear position switch installation.

21. Start the engine. Move the shift lever through all

gears, and verify the following:

• The shift lever cannot be moved to the posi-

tion from the position without pushing the

shift lever.

• The engine will not start in any gear, only in the

or position.

• The back-up lights come on when the shift lever

is in the position.
A/T GEAR POSITION

INDICATORProCarManuals.com

GAUGE ASSEMBL Y UNDER-HOO
D FUSE/RELA Y BO X
AB S INDICATO R LIGH T
ABS UNI T(7.5 A ) FUS ESTOP/HOR
N
(2 0 A ) FUS E
UNDER-DAS H FUSE/RELA Y BO X
BATTER Y(120 A ) FUS E
R/ C MIRROR /
REAR DEFROSTE RRELAY (7. 5 A ) FUS E
BACK-U P LIGHTS /
METE R LIGHT S
(1 0 A ) FUS E ECU/CRUIS
E CONTRO L
(1 5 A ) FUS E
UNDER-DAS H RELA Y BO X
REA R FAIL-SAF E RELA Y
FRONT FAIL-SAF E RELA Y
ABS PUM PMOTO R RELA Y
AB S B 1 (2 0 A ) FUS E
IG S W (5 0 A ) FUS E
AB
S B 2 (1 5 A ) FUS E AB
S MOTO R (4 0 A ) FUS E
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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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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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Component Location s
ABS CONTRO L UNI TSERVIC E CHEC K CONNECTO R (2P )
STEERIN G ANGL E SENSO R RIGHT-REA
R WHEE L SENSO R
TCS CONTRO L UNI T
UNDER-DAS H RELA Y BO X
POWERTRAI N
CONTRO L MODUL E (PCM )
EC T SENSO R
TC S CONTRO L VALV E
SENSO R
RIGHT-FRON T
WHEE L SENSO R
LEFT-REA RWHEEL SENSO R
TC S SWITC H
UNDER-DAS H FUSE/RELA Y BO X
UNDER-DAS H FUSE/RELA Y BO X
GAUG E ASSEMBL Y
TC S INDICATO R LIGH T
UNDER-HOO D FUSE/RELA Y BO X BACK-U
P LIGHTS /
METE R LIGHT S
(1 0 A ) FUS E EC
U (PCM)/CRUIS E
CONTRO L
(1 5 A ) FUS E
BATTER Y (120A ) FUS E
UNDER-DASH RELA Y BO X
I G S W (5 0 A ) FUS E
FAIL-SAF E RELA Y
TCS CONTRO L
VALV E ACTUATO R
UNDER-HOO D FUSE/RELA Y BO X
LEFT-FRON
T WHEE L SENSO R
TCS/RUNNIN GLIGHT (1 5 A ) FUS ESTOP/HOR N(20 A ) FUS E
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PGM-FI System

Engine Control Module (ECM)

Is the low oil pressure light on?

Try to start the engine.

Does the engine start?

Check for an open in the wire or

bulb (MIL line):

1. Turn the ignition switch OFF.

2. Connect the ECM connector ter-

minal A7 to body ground with a

jumper wire.

3. Turn the ignition switch ON (II).
NOTE: If this symptom is intermittent, check for a loose fuse No. 1 (BACK UP

LIGHTS, METER LIGHTS, 10 A) in the under-dash fuse/relay box, a poor con-

nection at ECM terminal A7, or an intermittent open in the GRN/RED wire

between the ECM (A7) and the gauge assembly.

Is the MIL on?

Substitute a known-good ECM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
ECM.
— Repair short in the wire

between NO. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10

A) fuse and gauge assembly.

— Replace No. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10 A)

fuse.

Check for an open in the wires

(PG1, PG2 lines):

1. Turn the ignition switch ON (II).

2. Measure voltage between

body ground and ECM con-

nector terminals A12 and A25

individually.

Is there less than 1.0 V?

Repair open in the wires

between ECM (A7) and gauge

assembly.

Replace the MIL bulb.
ECM CONNECTOR A (26P)

Wire side of female terminals

Repair open in the wire(s)

between ECM and G101 (located

at left side of engine) that had

more than 1.0 V.

ECM CONNECTOR A (26P)

Wire side of female terminals
The Malfunction Indicator Lamp

(MIL) never comes on (even for

two seconds) after ignition is

turned on.

Turn the ignition switch ON (II).

JUMPER WIREProCarManuals.com

Idle Spee d Settin g
Inspection/Adjustmen t
NOTE:
• Befor e settin g th e idl e speed , chec k th e followin g
items:
— Th e MI L ha s no t bee n reporte d on .
— Ignitio n timin g
— Spar k plug s
— Ai r cleane r
— PC V syste m
• (Canada ) Pul l th e parkin g brak e leve r up . Star t th e
engine , the n chec k tha t th e headlight s ar e off .
1 . Star t th e engine . Hol d th e engine at 3,00 0 rp m wit h
no loa d (transmissio n i n o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Connec t a tachometer .
3 . Disconnec t th e IA C valv e connector .
IAC VALV E
4.
5.
Star t th e engin e wit h th e accelerato r peda l slightl y
depressed . Stabiliz e th e rp m a t 1,000 , the n slowl y
releas e th e peda l unti l th e engin e idles .
Check idlin g in no-loa d conditions : headlights , blow -
er fan , rea r defogger , radiato r fan , an d ai r conditione r
ar e no t operating .
Idl e spee d shoul d be :
550 ± 5 0 rp m
(in o r position )
Adjust th e idl e speed , i f necessary, by turnin g th e
idl e adjustin g screw .
NOTE : Afte r adjustin g th e idl e spee d i n thi s step ,
rechec k th e ignitio n timin g (se e sectio n 23 ).
I f i t i s ou t o f spec , g o bac k t o ste p 4 .
IDL E ADJUSTIN G SCRE W
6. Tur n th e ignitio n switc h OFF .
7 . Reconnec t th e 2 P connecto r o n th e IA C valve , the n
d o th e EC M rese t procedure .
8 . Restar t an d idl e th e engine with no-loa d condition s
fo r on e minute , the n chec k th e idl e speed .
NOTE : (Canada ) Pul l th e parkin g brak e leve r up .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
Idle spee d shoul d be :
700 ± 5 0 rp m
(in o r position )
9 . Idl e th e engin e fo r on e minut e wit h headlight s (Low )
O N an d chec k th e idl e speed .
Idl e spee d shoul d be :
770 ± 5 0 rp m
(in o r position )
10 . Tur n th e headlight s off .
Idl e th e engin e fo r on e minut e wit h heate r fa n switc h
a t H I an d ai r conditione r on , the n chec k th e idl e speed .
Idl e spee d shoul d be :
770 ± 5 0 rp m
(in o r position )
NOTE : I f th e idl e spee d i s no t withi n specification ,
se e Sympto m Char t o n pag e 11-36 .
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Intake Ai r Syste m Emissio
n Contro l Syste m
Intake Ai r Bypas s (IAB ) Contro l
Syste m (cont'd )
Intake Ai r Bypas s (IAB ) Contro l Valv e Testin g
1. Chec k th e IA B contro l valv e shaf t fo r bindin g o r stick -
ing.
2. Chec k th e IA B contro l valv e fo r smoot h movement .
3. Chec k tha t o f th e IA B contro l valv e is i n clos e con -
tac t wit h th e stoppe r whe n th e vacuu m hos e i s dis -
connecte d fro m th e IA B contro l diaphragm .
IAB CONTRO L VALV ESTOPPE R
4.Chec k tha t o f th e IA B contro l valv e is in clos e con -
tac t wit h th e full-clos e scre w whe n yo u appl y 5 1 kP a
(38 0 mmHg , 1 5 inHg ) o f vacuu m to th e IA B contro l
diaphragm .
FULL-CLOS ESCREW(Do no t adjust. )
If an y faul t i s found , clea n th e linkag e an d shaft s wit h
carbureto r cleaner . I f th e proble m stil l exist s afte r clean -
ing , disassembl e th e intak e manifol d an d chec k th e IA B
valv e bod y assembl y (se e sectio n 9 ).
Syste m Descriptio n
The emissio n contro l syste m include s a War m U p Thre e
Wa y Catalyti c Converte r (W U TWC) , a Thre e Wa y Catalyti c
Converte r (TWC) , Exhaus t Ga s Recirculatio n (EGR ) system ,
Positiv e Crankcas e Ventilatio n (PCV ) syste m an d
Evaporativ e Emissio n (EVAP ) Contro l system . Th e emis -
sio n contro l syste m is designe d t o mee t federa l an d stat e
emissio n standards .
Tailpipe Emissio n
Inspectio n
Do no t smok e durin g thi s procedure . Kee p
an y ope n flam e awa y fro m you r wor k area .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (transmissio n i n o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Connec t a tachometer .
3 . Chec k an d adjus t th e idl e speed , i f necessar y (se e
pag e 11-117 ).
4 . War m u p an d calibrat e th e C O mete r accordin g to th e
mete r manufacturer' s instructions .
5 . Chec k idl e C O wit h th e headlights , heate r blower ,
rea r windo w defogger , coolin g fan , an d ai r condition -
er off .
NOTE : (Canada ) Pul l th e parkin g brak e leve r up .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
CO mete r shoul d indicat e 0.1 % maximum .
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