sensor ACURA RL KA9 1996 Service Repair Manual

Evaporator Temperatur e
Sensor Powe r Transisto r
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e evaporato r temperatur e senso r
wit h th e specification s show n i n followin g graph ; resis -
tanc e shoul d b e withi n specifications .
NOTE : Di p th e senso r i n ic e water , an d measur e resis -
tance . The n pou r ho t wate r o n th e sensor , an d chec k fo r
chang e in resistance .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f 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 .
EVAPORATO R TEMPERATUR E SENSO R
2 P CONNECTO R
Test
Termina l sid e o f mal e terminal s
RESISTANC E
k
1. Disconnec t th e 3 P connecto r fro m th e powe r tran -
sistor .
2 . Pul l ou t th e No . 2 (ORN ) termina l fro m th e connec -
tor.
3. Connec t a 1. 2 - 3. 4 wat t bul b a s shown , the n recon -
nec t th e 3 P connecto r t o th e powe r transistor .
12V 1.2-3. 4 WBUL B
No. 3 (BLU/RED )
4. Tur n th e ignitio n switc h O N (II) , an d chec k tha t th e
blowe r moto r runs .
CAUTION :
T o avoi d a loos e o r disconnecte d terminal , b e carefu l
no t t o damag e th e lockin g ta b whe n disconnectin g
an d connectin g th e terminal .
Insulat e th e No . 2 (ORN ) termina l fro m th e bod y unti l
th e testin g is completed .
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Evaporator/Blower Uni t
Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
i n th e SR S (sectio n 24 ) befor e performin g repair s o r ser -
vice .
1 . Recove r th e refrigeran t wit h a recovery/recycling /
chargin g statio n (se e pag e 22-75 ).
2 . Remov e th e bol t an d th e clam p fro m th e evaporator .
Remov e th e bolt , the n disconnec t th e capillar y tub e
fro m th e suctio n line . Remov e th e bolts , the n discon -
nec t th e suctio n an d receive r line s fro m th e evapora -
tor . Remov e th e mountin g nu t fro m th e evaporator .
NOTE:
Be carefu l no t t o damag e o r ben d th e capillar y tube .
Plu g o r ca p th e line s immediatel y afte r discon -
nectin g the m to avoi d moistur e an d dus t contami -
nation .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
CAPILLAR Y TUB E
CLAM P
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m ,
7. 2 Ibf-ft )
RECEIVE R LIN E
SUCTIO N LIN E
3. Tur n th e ignitio n switc h O N (II) , an d se t th e recircu -
latio n contro l switc h o n RECIRCULATE .
4 . Remov e th e glov e bo x (se e sectio n 20 ).
5 . Remov e th e trun k opene r mai n switc h connector ,
th e self-tappin g screw s an d th e glov e bo x bac k
cover .
GLOV E BO XBAC K COVE RTRUNK OPENE R MAI N
SWITC H CONNECTO R
6.Remov e th e servic e chec k connector , th e screw s
an d th e bolt , the n remov e th e blowe r unde r cove r
with th e glov e bo x frame .
SERVIC E CHEC K CONNECTO R
GLOV E BO X FRAM E
BLOWER UNDE R COVE R
7. Disconnec t th e A/ C wir e harnes s connecto r fro m th e
mai n wir e harness . Remov e th e wir e harnes s clips .
Disconnec t th e connector s fro m th e recirculatio n
contro l motor , th e evaporato r temperatur e sensor ,
th e powe r transisto r an d th e blowe r motor . Remov e
the screw , the n remov e th e blowe r moto r rela y an d
the blowe r moto r hig h rela y togethe r wit h th e
bracket .
WIRE HARNES S CLIP SBLOWE
R MOTO R RELAY ,
BLOWE R MOTO R HIG H RELA Y
A/ C WIR E HARNES S
CONNECTO R
EVAPORATO RTEMPERATUR E
SENSO R
RECIRCULATIO N
CONTRO L MOTO R
BLOWER MOTO R
POWE R TRANSISTO R
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Overhaul
NOTE: Th e blowe r moto r an d th e recirculatio n contro l
moto r ca n b e replace d withou t removin g th e evapora -
tor/blowe r unit .
1 . Remov e th e filte r li d an d th e dus t an d polle n filte r
assemblies , the n remov e th e bolt s an d th e recircu -
latio n housing . I f necessary , remov e th e self-tap -
pin g screw s an d th e recirculatio n contro l motor .
2 . I f necessary , remov e th e self-tappin g screws , th e
blowe r motor , th e self-tappin g screw s an d th e powe r
transistor .
3 . Pul l ou t th e evaporato r temperatur e sensor . Remov e
th e self-tappin g screws , the n carefull y separat e th e
housings . Remov e th e evaporator .
4 . I f necessary , remov e th e expansio n valv e an d th e
evaporato r lines .
NOTE : Whe n loosenin g th e nut s o f th e expansio n
valve , us e a secon d wrenc h t o hol d th e expansio n
valve . Otherwise , the y ca n b e damaged .
RECIRCULATIO N
CONTRO L MOTO R
Test , pag e 22-5 9
FILTE R LI D
UPPE R HOUSIN G
EVAPORATO RBlow dir t ou t o f fin swith compresse d air .
97. 4 mm (3.8 3 in)
Cor e cente r
32.7 mm (1.2 9 in)
EVAPORATO R
TEMPERATUR E
SENSO R
Test, pag e 22-6 3
LOWE R HOUSIN G
EXPANSIO N VALV E
POWE R TRANSISTO R
Test , pag e 22-6 3
5.Assembl e in th e revers e orde r o f disassembly . Mak e
not e o f followin g items .
Replac e th e O-ring s wit h ne w one s a t eac h fittin g
an d appl y a thi n coa t of refrigeran t oi l befor e
installin g them .
NOTE : B e sur e to us e th e righ t O-ring s fo r HFC -
134 a (R-134a ) t o avoi d leakage .
Instal l th e expansio n valv e capillar y tub e wit h
th e capillar y tub e i n contac t wit h th e outle t lin e
directly , an d wra p it wit h tape .
NOTE : Mak e sur e ther e is n o foreig n matte r stuc k
betwee n th e capillar y tub e an d th e outle t line .
Reinstal l th e evaporato r temperatur e senso r t o
it s origina l location .
Whe n removin g recirculatio n contro l motor , mak e
sur e tha t th e recirculatio n contro l door s an d link -
ag e mov e smoothl y withou t binding .
Afte r reassembly , mak e sur e th e recirculatio n
contro l moto r run s smoothl y (se e pag e 22-59 ).
Mak e sur e tha t ther e is n o ai r leakage .
RECIRCULATIO N
HOUSIN G
DUS T AN D POLLE N FILTE R ASSEMBLIE S
GROMME T
EVAPORATO R LINE S
CAPILLAR Y TUB E
TAPE S (Replace )
BLOWE R MOTO R
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A/C Syste m Servic e
Pressur e Tes t Char t
NOTE : Performanc e Tes t i s o n pag e 22-76 .
Test result s
Discharg e (high )
pressur e abnor -
mall y hig h
Discharg e pres -
sur e abnormall y
low
Suctio n (low )
pressur e abnor -
mally lo w
Suctio n pres -
sur e abnormall y
high
Suctio n an d dis -
charg e pres -
sure s abnormall y
hig h
Suctio n an d dis -
charg e pressur e
abnormall y lo w
Refrigeran t leak s
Relate d symptom s
After stoppin g compressor , pres -
sur e drop s t o abou t 20 0 kP a
(2. 0 kgf/cm
2, 2 8 psi ) quickly , an d
the n fall s gradually .
Reduce d o r n o ai r flo w throug h
condense r
Lin e to condense r i s excessivel y
hot.
Hig h an d lo w pressure s ar e bal -
ance d soo n afte r stoppin g compres -
sor . Lo w sid e is highe r tha n normal .
Outle t o f expansio n valv e is no t
frosted , low-pressur e gaug e indi -
cate s vacuum .
Expansio n valv e is no t frosted , an d
low-pressur e lin e is no t cold . Low -
pressur e gaug e indicate s vacuum .
Discharg e temperatur e is low , an d
th e ai r flo w fro m vent s i s restricted .
Expansio n valv e is frosted .
Receiver/drye r outle t i s cool , an d
inle t i s war m (shoul d b e war m
durin g operation) .
Low-pressur e hos e an d chec k
join t ar e coole r tha n th e tempera -
tur e aroun d evaporator .
Suctio n pressur e is lowere d whe n
condense r i s coole d b y water .
Hig h an d lo w pressur e ar e equal -
ize d a s soo n a s th e compresso r i s
stopped , an d bot h gauge s fluctu -
ate whil e running .
Reduce d ai r flo w throug h con -
denser .
Low-pressur e hos e an d meta l en d
area s ar e coole r tha n evaporator .
Temperatur e aroun d expansio n
valv e i s to o lo w compare d wit h
tha t aroun d receiver/dryer .
Compresso r clutc h i s dirty .
Compresso r bolt(s ) ar e dirty .
Compresso r gaske t i s we t wit h oil . Probabl
e caus e
Ai r i n syste m
• Clogge d condense r o r
radiato r fin s
• Condense r o r radiato r fa n
no t workin g properl y
Restricte d flo w o f refriger -
an t i n syste m
• Fault y compresso r dis -
charg e valv e
• Fault y compresso r sea l
• Fault y expansio n valv e
• Moistur e in syste m
• Froze n expansio n valv e
• Fault y expansio n valv e
Froze n evaporato r
Clogged expansio n valv e
Clogge d receiver/drye r
• Expansio n valv e ope n to o
lon g
• Loos e expansio n capillar y
tub e
Excessiv e refrigeran t i n sys -
tem
• Fault y gaske t
• Fault y high-pressur e valv e
• Foreig n particl e stuc k in
high-pressur e valv e
• Clogge d condense r o r
radiato r fin s
• Condense r o r radiato r fa n
no t workin g properl y
Clogge d o r kinke d low -
pressur e hos e part s
Clogge d high-pressur e lin e
Compresso r shaf t sea l leakin g
Leakin g aroun d bolt(s )
Gaske t leakin g Remed
y
Recover , evacuate , an d
recharg e wit h specifie d amount .
Evacuation : se e pag e 22-8 8
Charging : se e pag e 22-8 9
• Clean .
• Chec k voltag e an d fa n rpm .
• Chec k fa n direction .
Restricte d line s
Replac e th e compressor .
• Replace .
• Recover , evacuate , an d
recharg e wit h specifie d amount .
Replac e th e expansio n valve .
Ru n th e fa n wit h compresso r
off , the n chec k evaporato r
temperatur e sensor .
Clea n o r replace .
Replace .
Repair o r replace .
Recover , evacuate , an d
recharg e wit h specifie d amount .
Replac e th e compressor .
• Clea n condense r an d radia -
tor.
• Chec k voltag e an d fa n rpm .
• Chec k fa n direction .
Repai r o r replace .
Repai r o r replace .
Replac e th e compressor .
Tighte n bolt(s ) o r replac e com -
pressor .
Replace th e compressor .
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*: Yo u ca n als o tes t th e switc h b y usin g th e self-diagnosi s functio n (mod e 2) . (Se e pag e 23-252 .)
Gaug e Assembl y
Componen t Locatio n Inde x
GAUG E ASSEMBL Y
Gauge/Termina l Location s Index , pag e 23-7 5
Replacement , pag e 23-8 5
Bul b Locations , pag e 23-7 6
Select/Rese t Switc h Test , pag e 23-8 4
FUEL GAUG E SENDIN G UNI TSee sectio n 1 1
PARKIN G BRAK E SWITC HSee sectio n 1 9
BRAK E FLUI D LEVE L SWITC HSee sectio n 1 9
ENGIN E COOLAN T TEMPERATUR E (ECT )
GAUG E SENDIN G UNI TSee sectio n 1 0
ENGIN E OI L PRESSUR E SWITCH *
Se e sectio n 8
VEHICL E SPEE D SENSO R (VSS) *
Troubleshooting , pag e 23-8 6
Replacement , pag e 23-8 5
OUTSID
E AI R TEMPERATUR E
SENSORSee sectio n 2 2
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Gauge/Terminal Locatio n Inde x
CONNECTO R "A " (C508 ) CONNECTO
R "B " (C509 )
A/ T GEA R POSITIO N
INDICATO R
Se e sectio n 1 4
COOLAN T TEMPERATUR E GAUGE :
See sectio n 1 0
SAFET Y INDICATO R
Se e pag e 23-8 8
FUE
L GAUGE :
See sectio n 1 1
TRI P METER/OUTSID E
AI R TEMPERATUR E INDICATOR :
Se e pag e 23-8 4
SPEEDOMETER
:
Indicates 6 0 mp h a t 1,02 6 rp m(60 km/ h at 63 7 rpm ) of th evehicl e spee d sensor(VSS) .
TACHOMETER :Indicates 10 0 rp m a t30 0 pulse s pe r minut eof th e ignitio n controlmodul e (ICM) .
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Gauge Assembl y
Select/Rese t Switc h Tes t
1. Remov e th e instrumen t pane l (se e sectio n 20 ).
2 . Disconnec t th e 5 P connecto r fro m th e switch .
SELECT/RESE TSWITCH
BULBS(0.84 W x 2 )
INSTRUMEN T PANE L
3. Chec k fo r continuit y betwee n th e terminal s i n eac h
switc h positio n accordin g t o th e table .
Outsid e Ai r Temperatur e Indicato r
NOTE: T o tes t th e outsid e ai r temperatur e sensor , refe r
t o sectio n 22 .
Troubleshootin g
If th e indicato r display s "888.8" , a s shown , fo r mor e tha n
2 second s afte r selectin g th e outsid e ai r temperatur e
displa y mode , chec k fo r a n ope n in th e wir e betwee n th e
gaug e an d th e outsid e ai r temperatur e sensor .
Calibratio n
The outsid e ai r temperatur e indicator' s displaye d
temperatur e ca n b e recalibrate d ±3 ° t o mee t th e
customer' s expectations .
1 . Tur n th e ignitio n switc h O N (II) .
2 . Selec t th e outsid e ai r temperatur e mode , the n pus h
an d hol d th e rese t butto n fo r 1 0 seconds . Whil e yo u
continu e t o hol d th e rese t button , th e displa y wil l
scrol l throug h temperatur e setting s fro m +3 ° t o -3 °
a s shown .
3 . Whe n th e desire d correctio n valu e appear s o n th e
display , releas e th e rese t button , an d th e recalibrate d
outsid e ai r temperatur e wil l b e displayed .
NOTE : T o recalibrat e th e displa y to th e tru e tempera -
ture , remov e th e outsid e ai r temperatur e sensor , bu t
leav e i t connected . Submerg e th e senso r an d a
thermomete r i n a containe r o f ic e water . Selec t th e
calibratio n mod e a s describe d above , the n
recalibrat e th e displa y to th e tru e temperature .
THERMOMETE R
OUTSIDE AI R TEMPERATUR ESENSOR
BEAKE R
ICE
4. I f th e continuit y check s d o no t agre e wit h th e table ,
remov e th e tw o screws , an d replac e th e switch .
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(To page 23-87) GR
N TES T HARNES S CLI P
TES
T HARNES S
07LA J-PT3020 A
Vehicle Spee d Senso r (VSS )
Troubleshootin g
Before testing , inspec t th e No . 1 3 (7. 5 A ) fus e in th e under-das h fuse/rela y box .
Test th e YE L wire :
1 . Disconnec t th e 3 P connecto r
fro m th e vehicl e spee d sensor .
2 . Connec t th e tes t harnes s
( 07LA J - PT30200A ) onl y t o
th e VS S sub-harness .
3. Connec t the Whites t harnes sclip t o th e positiv e prob e o f avoltmeter .4. Tur n th e ignitio n switc h O N (II) .
Is ther e batter y voltage ? Repai
r ope n i n th e YE L wir e
betwee n th e VS S an d under -
das h fuse/rela y box .NO
YE S
Tes t th e BLU/WH T wire :
1 . Disconnec t th e WH T tes t har -
nes s clip .
2 . Connec t th e GR N tes t harnes s
clip t o th e positiv e prob e o f avoltmeter .
Is ther e 5 V or more ?NO
Repai r shor t i n th e BLU/WH T wir ebetwee n th e VS S an d— PCM ,— cruis e contro l unit ,
— steerin g colum n contro l unit ,
— multiple x contro l uni t (driver's) ,
— navigatio n contro l unit .
YES
GR N TES T HARNES SCLIP
VSS
TES T HARNES S
07LA J-PT3020 A RE
D TES T HARNES S
CLIP
PROTECTIV ETAPE
WHT TES T HARNES S CLI P
WH T TES T HARNES S
CLIP
VSS
RE D TES T HARNES SCLIP
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Safety Indicato r Syste m
Brake Ligh t Failur e Senso r Tes t
'96 - 9 8 models :
1 . Firs t mak e sur e th e brak e light s com e o n whe n th e
brak e peda l i s pressed .
• I f al l th e brak e light s com e on , g o t o ste p 2 .
• I f on e o f th e brak e light s doe s no t com e on , chec k
whethe r th e bul b is blown . I f th e bul b is OK , g o to
ste p 2 .
• I f non e o f th e brak e light s com e on , chec k th e
brak e ligh t circui t.
2 . Ope n th e trun k lid .
3 . Pul l bac k th e lef t trun k sid e pane l t o uncove r th e
brak e ligh t failur e senso r (se e sectio n 20 ).
4 . Mak e sur e th e ligh t i n th e safet y
indicato r doe s no t com e o n an d sta y o n whe n th e
No . 1 termina l o f th e 8 P connecto r i s grounde d an d
the ignitio n switc h is turne d fro m OF F to O N (II) .
• I f th e ligh t doe s no t g o off , chec k
for:
an ope n i n th e WHT/GR N wir e betwee n th e
safet y indicato r an d lef t taillight .
a fault y safet y indicato r circui t i n th e gaug e
assembly .
• I f th e ligh t goe s off , g o t o ste p 5 .
5. Mak e sur e th e ligh t i n th e safet y indi -
cato r come s o n an d goe s of f whe n th e No . 7 termina l
o f th e 8 P connecto r i s grounded , th e brak e peda l i s
depressed , an d th e ignitio n switc h is turne d fro m OF F
to O N (II) .
• I f th e ligh t doe s no t g o off , replac e
th e brak e ligh t failur e sensor .
• I f th e ligh t goe s off , chec k for :
poo r groun d (G701) .
an ope n i n th e BL K wire .
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'99 - 0 1 models :
1 . Firs t mak e sur e th e brak e light s com e o n whe n th e
brak e peda l i s pressed .
• I f al l th e brak e light s com e on , g o t o ste p 2 .
• I f on e o f th e brak e light s doe s no t com e on , chec k
whethe r th e bul b is blown . I f th e bul b is OK , g o to
ste p 2 .
• I f non e o f th e brak e light s com e on , chec k th e
brak e ligh t circui t.
2 . Ope n th e trunk lid, an d remov e th e rea r trunk side
trim (se e sectio n 20 ).
4 . Mak e sur e th e ligh t i n th e safet y indi -
cato r come s o n an d goe s of f whe n th e No . 2 termina l
o f th e lef t o r righ t 6 P connecto r i s grounded , th e brak e
pedal i s pressed , an d th e ignitio n switc h is turne d
from OF F to O N (II) .
• I f th e ligh t doe s no t g o off , replac e
the lef t o r righ t brak e ligh t failur e sensor .
• I f th e ligh t goe s off , chec k for :
a poo r groun d (G701 )
an ope n in th e BL K wire .
Wire sid e o f
femal e terminal s
GRN/WH TBLK
3. Mak e sur e th e ligh t i n th e safet y indi -
cato r doe s no t com e o n an d sta y o n whe n th e lef t
an d righ t 6 P connector s ar e disconnecte d an d th e
ignitio n switc h is turne d fro m OF F to engin e running .
If th e ligh t i n th e safet y indicato r
comes o n an d stay s on , chec k for :
shor t t o groun d o n th e WHT/GR N wir e betwee n
th e safet y indicato r an d th e No . 4 termina l o f th e
lef t o r righ t brak e ligh t failur e sensor ,
a fault y safet y indicato r circui t (printe d circui t
board) i n th e gaug e assembly .
• I f th e ligh t doe s no t com e on , g o
t o ste p 4 .
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