ACURA RL KA9 1996 Service Repair Manual

Troubleshooting
In-car Temperatur e Senso r
Self-diagnosi s indicato r ligh t A come s on : A proble m in th e in-ca r temperatur e senso r circuit .
The in-ca r temperatur e senso r i s a temperatur e dependen t resisto r (thermistor) . Th e resistanc e o f th e thermisto r decreas -
es a s th e temperatur e insid e th e vehicl e increases .
Self-diagnosi s circui t chec k indi -
cate s a proble m in th e in-ca r
temperatur e senso r circuit .
Chec k th e in-ca r temperatur e
sensor:1. Remov e th e in-ca r temperatur e
senso r (se e pag e 22-60 ), an d
disconnec t th e 2 P connector .2. Measur e th e resistanc e
betwee n th e No . 1 an d No . 2
terminal s o f th e in-ca r tem -
peratur e sensor .
* I s th e resistanc e withi n th e spec -
ification s show n o n th e graph .
Chec k fo r a shor t i n th e wire :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .
2 . Chec k fo r continuit y betwee n
th e No . 6 termina l o f th e 20 P
connecto r an d bod y ground .
IN-CAR TEMPERATUR E SENSO R
RESISTANC Ek
14 3 2 5 0 6 8 8 6 104° F
-1 0 0 10 2 0 3 0 40° C
CAUTION : Th e senso r use s a thermisto r whic h
ca n b e damage d if hig h curren t i s applie d durin g
testing . Therefore , us e a circui t teste r wit h a n
outpu t o f 1 m A o r les s a t th e 2 0 k range .
* Chec k fo r chang e i n resistanc e b y
heatin g o r coolin g th e senso r wit h a
hai r drier , etc .
Replac e th e in-ca r temperatur esensor.
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ?
T o pag e 22-1 7 Repai
r shor t i n th e wir e betwee n
th e climat e contro l uni t an d th e
in-ca r temperatur e sensor .
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From pag e 22-1 6
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 6 termina l o f th e climat e con -
tro l uni t 20 P connecto r an d th e
No . 2 termina l o f th e in-ca r tem -
peratur e senso r 2 P connector .
I s ther e continuity ?
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 2 termina l o f th e climat e con -
trol uni t 8 P connecto r an d th eNo. 1 termina l o f th e in-ca r tem -
peratur e senso r 2 P connector .
I s ther e continuity ?
Chec k fo r loos e wire s o r poo r
connection s a t th e climat e con -
tro l uni t 8 P an d 20 P connector s
an d a t th e in-ca r temperatur e
senso r 2 P connector . I f th e con -
nection s ar e good , substitut e a
known-goo d climat e contro l unit ,
an d recheck . I f th e symptom/indi -
catio n goe s away , replac e th e
origina l climat e contro l unit . CLIMAT
E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
BRN/BLK
IN-CAR TEMPERATUR E SENSO R 2P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
in-ca r temperatur e sensor .
CLIMATE CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
in-ca r temperatur e sensor .
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Troubleshooting
Outside Ai r Temperatur e Senso r
Self-diagnosi s indicato r ligh t B come s on : A proble m in th e outsid e ai r temperatur e senso r circuit .
Th e outsid e ai r temperatur e senso r i s a temperatur e dependen t resisto r (thermistor) . Th e resistanc e o f th e thermisto r
decrease s a s th e temperatur e outsid e th e ca r increases .
OUTSIDE AI R TEMPERATUR E SENSO R
Self-diagnosi s circui t chec k indi -
cate s a proble m in th e outsid e
ai r temperatur e senso r circuit .
Chec k th e outsid e ai r tempera -
tur e sensor :
1. Remov e th e outsid e ai r tem -peratur e senso r (se e pag e
22-61 ), an d disconnec t th e
2P connector .
2 . Measur e th e resistanc e
betwee n th e No . 1 an d No . 2
terminal s o f th e outsid e ai r
temperatur e sensor .
* I s th e resistanc e withi n th e spec -
ification s show n o n th e graph .
Chec k fo r a shor t i n th e wire :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .2. Measur e th e resistanc e
betwee n th e No . 5 termina l o f
th e 20 P connecto r an d bod y
ground .
Is ther e mor e tha n 1 0 k ?
T o pag e 22-1 9 Termina
l sid e o f mal e terminal s
RESISTANC Ek
* Di p th e senso r i n ic e water , an d mea -
sur e resistance . The n pou r ho t wate r
o n th e sensor , an d chec k fo r chang e in
resistance .
Replace th e outsid e ai r tempera -
tur e sensor . CAUTION
: Th e senso r use s a thermisto r whic h
ca n b e damage d if hig h curren t i s applie d durin g
testing . Therefore , us e a circui t tester with a n
outpu t o f 1 m A o r les s a t th e 2 0 k range .
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t i n th e wir e betwee n
th e climat e contro l unit , th e out -
sid e ai r temperatur e senso r an d
th e gaug e assembly , o r chec k th e
gaug e assembl y (se e sectio n 23 ).
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From pag e 22-1 8
CLIMATE CONTRO L UNI T 20 P CONNECTO R
Wire sid e o f femal e terminal s
Check fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 5 termina l o f th e climat e con -
trol uni t 20 P connecto r an d th eNo . 2 termina l o f th e outsid e ai r
temperatur e senso r 2 P connector .
OUTSIDE AI R TEMPERATUR E SENSO R
2P CONNECTO RWire sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
outsid e ai r temperatur e sensor .
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 2 termina l o f th e climat e con -
tro l uni t 8 P connecto r an d th e No .
1 termina l o f th e outsid e ai r tem -
peratur e senso r 2 P connector . CLIMAT
E CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
outsid e ai r temperatur e sensor .
Chec k fo r loos e wire s o r poo r
connection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e outsid e ai r temperatur e sen -
so r 2 P connector . I f th e connec -
tion s ar e good , substitut e a
known-goo d climat e contro l unit ,
an d recheck . I f th e symptom/indi -
catio n goe s away , replac e th e
origina l climat e contro l unit .
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Troubleshooting
Sunlight Senso r
Self-diagnosi s indicato r ligh t C come s on : A proble m in th e sunligh t senso r circuit .
The sunligh t senso r i s a ligh t sensitive , variabl e resistanc e diode . Th e resistanc e o f th e diod e increase s a s th e intensit y o f
the ligh t increases .
Check fo r a shor t i n th e wire :1. Remov e th e climat e contro lunit (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .
2 . Remov e th e sunligh t senso r
(se e pag e 22-62 ), an d discon -
nec t th e 2 P connector .
3 . Chec k fo r continuit y betwee n
the No . 1 6 termina l o f th e 20 Pconnecto r an d bod y ground .
T o pag e 22-2 1
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From pag e 22-2 0 CLIMAT
E CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 2 termina l o f th e climat e con -
trol uni t 8 P connecto r an d th eNo . 1 termina l o f th e sunligh tsensor 2 P connector .
SUNLIGHT SENSO R 2P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n i n th e wir e betwee n
th e climat e contro l uni t an d th e
sunligh t sensor .
Reconnec t th e 2 P connecto r t o
th e sunligh t sensor , an d tes t th e
senso r (se e pag e 22-62 ).
I s th e sunligh t senso r OK ?
Replace th e sunligh t sensor .
Chec k fo r loos e wire s o r poo r
connection s a t th e climat e con -
tro l uni t 8 P an d 20 P connector s
an d a t th e sunligh t senso r 2 P
connector . I f th e connection s ar e
good , substitut e a known-goo d
climat e contro l unit , an d recheck .
I f th e symptom/indicatio n goe s
away , replac e th e origina l cli -
mat e contro l unit .
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Troubleshooting
Evaporator Temperatur e Senso r
Self-diagnosi s indicato r ligh t D come s on : A proble m in th e evaporato r temperatur e senso r circuit .
The evaporato r temperatur e senso r i s a temperatur e dependen t resisto r (thermistor) . Th e resistanc e o f th e thermisto r
decreases a s th e evaporato r outle t ai r temperatur e increases .
Self-diagnosi s circui t chec k indi -
cate s a proble m in th e evapora -
to r temperatur e senso r circuit .
I s th e resistanc e withi n th e speci -
fication s show n o n th e graph .
Chec k fo r a shor t i n th e wire :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .
2 . Chec k fo r continuit y betwee n
the No . 4 termina l o f th e 20 Pconnecto r an d bod y ground .
I s ther e continuity ?
T o pag e 22-2 3
EVAPORATO R TEMPERATUR E SENSO R
Termina l sid e o f mal e terminal s
Replac e th e evaporato r tempera -
tur e sensor .
5010682 086° F30°C
CAUTION : Th e senso r use s a thermisto r whic h
ca n b e damage d if hig h curren t i s applie d durin g
testing . Therefore , us e a circui t teste r wit h a n
outpu t o f 1 m A o r les s a t th e 2 0 k range .
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t i n th e wir e betwee n
th e climat e contro l uni t an d th e
evaporato r temperatur e sensor .
Chec
k th e evaporato r tempera -
tur e sensor :
1 . Disconnec t th e evaporato r
temperatur e senso r 2 P con -
nector .
2 . Measur e th e resistanc e
betwee n th e No . 1 an d No . 2
terminal s o f th e evaporato r
temperatur e sensor .
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From pag e 22-2 2
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 4 termina l o f th e climat e con -
trol uni t 20 P connecto r an d th eNo . 2 termina l o f th e evaporato r
temperatur e senso r 2 P connector .
I s ther e continuity ?
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 2 termina l o f th e climat e con -
tro l uni t 8 P connecto r an d th e No .
1 termina l o f th e evaporato r tem -
peratur e senso r 2 P connector . CLIMAT
E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e climat e contro l uni t an d th e
evaporato r temperatur e sensor .
EVAPORATO R TEMPERATUR E SENSO R
2P CONNECTO RWire sid e o f femal e terminal s
CLIMAT E CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n i n th e wir e betwee n
th e climat e contro l uni t an d th e
evaporato r temperatur e sensor .
Chec k fo r loos e wire s o r poo r con -
nection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e evaporato r temperatur e sen -
so r 2 P connector . I f th e connec -
tion s ar e good , substitut e a
known-goo d climat e contro l unit ,
an d recheck . I f th e symptom/indi -
catio n goe s away , replac e th e
origina l climat e contro l unit .
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Troubleshooting
Air Mi x Contro l Moto r
Self-diagnosi s indicato r ligh t E come s on : A proble m in th e ai r mi x contro l moto r circuit .
Th e ai r mi x contro l moto r regulate s th e mixtur e o f cool/ho t ai r accordin g to outpu t fro m th e climat e contro l unit .
Is th e ai r mi x contro l moto r OK ?
Chec k fo r a shor t i n th e wire(s) :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .
2 . Chec k fo r continuit y betwee n
bod y groun d an d th e 8 P con -
necto r terminal s No . 2 an d
No . 3 individually , an d betwee n
bod y groun d an d th e 20 P con -
necto r terminal s No . 9 , 1 0 an d
1 5 individually .
I s ther e continuity ? Chec
k th e ai r mi x contro l linkag e
an d doors :
1 . Remov e th e ai r mi x contro l
moto r (se e pag e 22-57 ).
2 . Chec k th e ai r mi x contro l link -
ag e an d door s fo r smoot h
movement .
D o th e ai r mi x control linkage an d
door s mov e smoothly ? Repai
r th e ai r mi x contro l linkag e
o r doors .
CLIMAT E CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Repai r an y shor t i n th e wire(s )
betwee n th e climat e contro l uni t
an d th e ai r mi x contro l motor .
(O)
Wir e sid e o f femal e terminal s
To pag e 22-2 5
Replac e th e ai r mi x contro l motor .
Chec
k th e ai r mi x contro l motor :
1 . Disconnec t th e ai r mi x contro l
moto r 5 P connector.
2 . Tes t th e ai r mi x contro l moto r
(see pag e 22-57 ).
Self-diagnosi s circui t chec k indi -
cate s a proble m in th e ai r mi x
contro l moto r circuit .
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CLIMATE CONTRO L UNI T 8 P CONNECTO R
Fro m pag e 22-2 4
Chec k fo r a shor t t o power :
Chec k th e sam e terminal s fo r
voltage .
Wire sid e o f femal e terminal s
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
I s ther e an y voltage ?
Chec k fo r a n ope n in th e wire(s) :
Chec k fo r continuit y betwee n fol -
lowin g terminal s o f th e climat econtrol uni t 8 P an d 20 P connec -tors an d th e ai r mi x contro lmotor 5 P connector .8P:No . 2No . 320P :No. 9No . 1 0No . 1 5
5P :No . 3No . 2
No . 5No . 1No . 4
Is ther e continuity ?
Chec k fo r loos e wire s o r poo r con -
nection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e ai r mi x contro l moto r 5 P con -
nector . I f th e connection s ar e
good , substitut e a known-goo d
climat e contro l unit , an d recheck .
I f th e symptom/indicatio n goe s
away, replac e th e origina l climat econtro l unit . Repai
r shor t t o powe r i n th e wir e
betwee n th e climat e contro l uni t
an d th e ai r mi x contro l motor .
(Thi s damage s th e climat e con -
tro l unit. ) Wir
e sid e o f femal e terminal s
AI R MI X CONTRO L MOTO R
5 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r an y ope n i n th e wire(s )
betwee n th e climat e contro l uni t
and ai r mi x contro l motor .
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