1995 ACURA TL Service Repair Manual

Brake Switc h Signa l
This signal s th e EC M whe n th e brak e peda l i s depressed .
Inspection o f Brak e Switc h Signal .
Are th e brak e light s o n withou tdepressin g th e brak e pedal ?Inspec t th e brak e switc h (se e sectio n 19 ).
Depres s th e brak e pedal .
D o th e brak e light s com e on ?
Is th e fus e OK ?
Chec k fo r a n ope n i n th e wir e(BKS W line) :
1 . Depres s th e brak e pedal .
2 . Measur e voltag e betwee n EC M
connecto r terminal s D1 2 an d
A26 wit h th e brak e peda l de -pressed . Repai
r shor t i n th e wir e be -
twee n th e brak e switc h an d
th e STO P HOR N (2 0 A ) fuse .
Replac e th e STO P HOR N (2 0 A )
fuse .
ECM CONNECTOR S
A (26P)D (22P )
Wire sid e o f femal e terminal s
Is ther e batter y voltage ? Repai
r ope n i n th e wir e betwee n
th e EC M (D12 ) an d th e brak e
switch .
Brak e switc h signa l i s OK . Repai
r ope n i n th e wire be-
twee n th e brak e switc h an d
th e STO P HOR N (2 0 A ) fuse .
Inspec t th e brak e switc h (se e
sectio n 19 ).
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Idle Contro l Syste m
Automati c Transaxl e (A/T ) Gea r Positio n Signa l
This signal s th e EC M whe n th e transmissio n is in o r position .
Does th e indicato r ligh t prop-erly ?See th e A/ T gea r positio n indica -
to r inspectio n (se e sectio n 14 ).
Chec k fo r a shor t i n th e wir e (AT P
P N line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e 16 P connecto r
fro m th e gaug e assembly .
3 . Disconnec t th e 26 P connecto r
from th e TCM .4. Tur n th e ignitio n switc h O N (II) .
5 . Measur e voltag e betwee n EC M
connecto r terminal s B 4 an d A26 .
I s ther e approx . 5 V ?
EC M CONNECTOR S
A (26P)B (16P)
Wire sid e o f femal e terminal s
I s ther e continuity ? Repai
r shor t i n th e wir e betwee n
th e EC M (B4 ) an d th e gaug e assem -
bly.
(To pag e 11-113 ) Substitut
e a known-goo d EC M
an d recheck . I f prescribe d volt -
ag e is no w available , replac e th e
origina l ECM .
Chec k fo r a shor t i n th e wir e (AT P
P N line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e EC M connec -
tor B (16P) .3. Chec k fo r continuit y betwee n
bod y groun d an d EC M con -
necto r termina l B4 .
Chec
k th e operatio n o f th e A/ T
gea r positio n switch :
1. Tur n th e ignitio n switc h O N (II) .2. Observ e th e A/ T shif t positio n
indicato r an d selec t eac h posi -
tio n separately .
Inspectio
n o f A/ T Gea r Positio n
Signal.
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(From pag e 11-112 )
ECM CONNECTOR S
A (26P)
Wire sid e o f femal e terminal s
I s ther e les s tha n 1. 0 V ? Repai
r ope n i n th e wir e be -
twee n th e EC M (B4 ) an d th e
gaug e assembly .Repair ope n in RE D wir e be -
twee n th e gaug e assembl y
an d th e A/ T gea r positio n
switch.
Check fo r a n ope n in th e wir e (AT PPN line) :Measur e voltag e betwee n EC M
connecto r terminal s B 4 an d A2 6
with th e transmissio n i n posi -tion.
Is ther e les s tha n 1. 0 V ? Repai
r ope n in BLK/BL U wir e be -
twee n th e gaug e assembl y an d
th e A/ T gea r positio n switch .
A/ T gea r positio n signa l i s OK .
Chec
k fo r a n ope n in th e wir e (AT P
P N line) :
1. Tur n th e ignitio n switc h OFF .2. Reconnec t th e 16 P connecto r
t o th e gaug e assembly .
3 . Reconnec t th e 26 P connecto r
to th e TCM .4. Star t th e engine .
5 . Measur e voltag e betwee n EC M
connecto r terminal s B 4 an d
A26 wit h th e transmissio n inposition .
B (16P)
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Idle Contro l Syste m
Power Steerin g Pressur e (PSP ) Switc h Signa l
This signal s th e EC M whe n th e powe r steerin g loa d is high .
Is ther e les s tha n 1. 0 V ?
Chec k th e operatio n o f th e PS Pswitch :
1 . Star t th e engin e
2 . Tur n steerin g whee l t o ful l
lock .3. Measur e voltag e betwee n EC M
connecto r terminal s B1 2 an d
A26 .
Is ther e batter y voltage ?
ECM CONNECTOR S
A (26P)B (16P)
Chec k fo r a n ope n in th e wir e (PS P
S W line) :
1 . Tur n th e ignitio n switc h OFF .
2. Disconnec t th e PS P switc h 2 Pconnector .3. Tur n th e ignitio n switc h O N (II) .
4 . A t th e harnes s side , connec t
th e PS P switc h 2 P connecto r
terminal s No . 1 an d No . 2
wit h a jumpe r wire .5. Measur e voltag e betwee n EC M
connecto r terminal s B1 2 an d
A26 .
Is ther e les s tha n 1. 0 V ? Repai
r ope n i n th e wir e be -
twee n th e EC M (B12 ) an d th e
PS P switch .
Repai r ope n in BL K wir e be -
twee n th e PS P switc h an d
G301 .
(To pag e 11-115 )PSP switc h signa l i s OK . Replac
e th e PS P switch . Wir
e sid e o f femal e terminal s
JUMPERWIRE
PSP SWITC H CONNECTO R (C309 )
Wire side of femal e terminal s
Chec
k fo r a n ope n in th e wir e (PS P
S W line) :1. Tur n th e ignitio n switc h O N (II) .2. Measur e voltag e betwee n EC M
connecto r terminal s B1 2 an d
A26 .
Inspectio n o f PS P switc h signal .
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(From pag e 11-114 )
Chec k fo r a shor t i n th e PS P
switch :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e 2 P connecto r
fro m th e PS P switch .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n EC M
connecto r terminal s B1 2 an d
A26 .
ECM CONNECTOR S
A (26P)B (16P)
Wire sid e o f femal e terminal s
I s ther e batter y voltage ?
B (16P)
Is ther e continuity ? Repai
r shor t i n th e wir e betwee nthe EC M (B12 ) and th e PS Pswitch .
Substitut e a known-goo d EC M
an d recheck . I f prescribe d volt -
ag e is no w available , replac e th e
origina l ECM .
Replac
e th e PS P switch .
Check fo r a shor t i n th e wir e (PS PSW line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e EC M connec -
tor B (16P) .3. Chec k fo r continuit y betwee n
bod y groun d an d EC M connec -
to r termina l B12 .
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Idle Contro l Syste m
Fast Idl e Therm o Valv e
Descriptio n
T o preven t errati c runnin g whe n th e engin e i s warmin g
up , i t i s necessar y t o rais e th e idl e speed . Th e fas t idl e
therm o valv e i s controlle d b y a thermowa x plunger .
When th e engin e i s cold , th e engin e coolan t surround -
in g th e thermowa x contract s th e plunger , allowin g addi -
tiona l ai r t o b e bypasse d int o th e intak e manifol d s o tha t
th e engin e idle s faster . Whe n th e engin e reache s operat -
in g temperature , th e valv e closes , reducin g th e amoun t
o f ai r bypassin g int o th e intak e manifold .
FASTIDLE THERM O VALV E
IDLEADJUSTIN GSCREW
IAC VALV E
AIR BYPAS SVALVE
WAX
Inspectio n
NOTE : Th e fas t idl e therm o valv e i s factor y adjusted ; i t
shoul d no t b e disassembled .
1. Remov e th e cove r o f th e fas t idl e therm o valve .
2 . Star t th e engine .
3.Pu t you r finge r o n th e valv e sea t are a an d mak e sur e
tha t ther e i s ai r flo w wit h th e engin e col d (engin e
coolan t temperatur e belo w 86°F , 30°C ) an d idling .
FAST IDL E THERM O VALV E
If not , replac e th e fas t idl e therm o valv e an d retest .
O-RING SReplace .
12 N- m(1.2 kgf-m , 8. 7 Ibf-ft )
4.
5 .
Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h n o
loa d (transmissio n in o r position ) unti l th e radia -
to r fa n come s on , the n le t i t idle .
Chec k tha t th e valv e i s completel y closed . I f not , ai r
suctio n ca n b e fel t i n th e valv e sea t area .
I f an y suctio n is felt , th e valv e is leaking .
Chec k engin e coolan t leve l an d fo r ai r i n th e engin e
coolin g syste m (se e sectio n 10 ).
I f OK , replac e th e fas t idl e therm o valv e an d recheck .
NOTE : I f th e cove r o f fas t idl e therm o valv e wa s removed ,
d o th e EC M rese t procedure .
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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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Fuel Supply System

Fuel Lines

NOTE: Check all fuel system lines, hoses, and components for damage, leaks and deterioration, and replace if necessary.

'95 - 96 models:

27 N-m

(2.8 kgf-m,

20 Ibf-ft)
27 N-m

(2.8 kgf-m,

20 Ibf-ft)

'97 - 98 models:
37 N-m

(3.8 kgf-m, 27 Ibf-ft)

27 N-m

(2.8 kgf-m,

20 Ibf-ft)
33 N-m

(3.4 kgf-m, 25 Ibf-ft)

37 N-m

(3.8 kgf-m, 27 Ibf-ft)ProCarManuals.com