ACURA RL KA9 1996 Service Repair Manual

Illustrated Inde x
SRS component s ar e locate d in 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 service .
SUNLIGH T SENSO R
Replacement , pag e 22-6 2
Test , pag e 22-6 2 HEATE
R UNI T
Replacement , pag e 22-6 9
Overhaul , pag e 22-7 1 RECIRCULATIO
N CONTRO L MOTO R
Replacement , pag e 22-5 9
Test , pag e 22-5 9
HEATE R VALV E CABL E
Adjustment , pag e 22-7 2
MOD E CONTRO L MOTO R
Replacement , pag e 22-5 8
Test , pag e 22-5 8 DUS
T AN D POLLE N FILTE R ASSEMBLIE S
Replacement , pag e 22-6 8
IN-CA R TEMPERATUR E SENSO R
Replacement , pag e 22-6 0
Test , pag e 22-6 0 CLIMAT
E CONTRO L UNI T
Replacement , pag e 22-5 5
Bul b Replacement , pag e 22-5 5
Fac e Panel/Butto n Replacement , pag e 22-5 6
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Wiring/Connector Location s
RADIATOR FA N RELA Y
(Locate d i n th e under-hoo d rela y bo x C )
Test , pag e 22-6 4
RADIATO R FA N MAI N RELAY ,
CONDENSE R FA N RELAY ,
COMPRESSO R CLUTC H RELA Y
(Locate d i n th e under-hoo d rela y bo x A )
Test , pag e 22-6 4
RIGH T ENGIN E
COMPARTMEN T
WIR E HARNES S
A/ C PRESSUR E SWITC H
CONNECTO R
RADIATO R FA N
CONNECTO R
OUTSID E AI R TEMPERATUR E SENSO R
Replacement , pag e 22-6 1
Test , pag e 22-6 1 FA
N CONTRO L UNI T
(Locate d behin d th e PC M cover )
PCM COVE R
LEFT ENGIN E
COMPARTMEN T
WIR E HARNES S
COMPRESSO R CLUTC H
CONNECTO R
CONDENSE R FA N CONNECTO R
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Wiring/Connector Location s
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 service .
BLOWE R MOTO R
CONNECTO R
EVAPORATO RTEMPERATUR ESENSORTest, pag e 22-6 3 RECIRCULATIO
N CONTRO L
MOTO R CONNECTO R
SUNLIGH T SENSO R
CONNECTO R BLOWE
R MOTO R RELA Y
Wir e colors : BLK/YEL ,
WHT , RED/BL K an d BL K
Test , pag e 22-6 4
BLOWE R MOTO R HIG H RELA Y
Wir e colors : BLK/YEL ,
BLU/RED , L T GR N an d BL K
Test , pag e 22-6 4
POWE R TRANSISTO R
Test , pag e 22-6 3
AI R MI X CONTRO L MOTO R
Replacement , pag e 22-5 7
Test , pag e 22-5 7
MOD E CONTRO L
MOTOR CONNECTO R
IN-CAR TEMPERATUR E
SENSO R CONNECTO R
CLIMATE CONTRO L
UNIT CONNECTOR S
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Description
Outline
The ai r conditione r syste m remove s hea t fro m th e passenge r compartmen t b y circulatin g refrigeran t throug h th e syste m
a s show n below .
High-temperature /
high-pressur e ga s High-temperature
/
high-pressur e liqui d
Suctio n an d compressio n
Radiation o f hea t
Trap s debris ,
an d remove s
moistur e High-temperature
/
high-pressur e liqui d
COMPRESSO R
EVAPORATOR
PRESSURE
REGULATO R (EPR )
VALVE
Less moisturize d
low-pressur e vapo r
RECEIVER/DRYE R
More liquidifie d
low-pressur e vapo r
EXPANSIO N VALV E
EVAPORATOR/BLOWE R UNIT
LIQUI D LIN E(High-side )
SUB CONDENSE R(Part o f condense r assembly )
SUCTION LIN E (Low-side )
COMPRESSO R
RECEIVER/DRYE R
Do no t mi x refrigerant s CFC-1 2 (R-12 ) an d HFC-134 a (R-134a) . The y ar e no t compatible .
Use onl y th e recommende d polyalkyleneglyco l (PAG ) refrigeran t oi l (ND-OI L 8 ) designe d fo r th e R-134 a compressor .
Intermixin g th e recommende d (PAG ) refrigeran t oi l wit h an y othe r refrigeran t oi l wil l resul t i n compresso r failure .
Al l A/ C syste m part s (compressor , discharg e line , suctio n line , evaporator , condenser , receiver/dryer , expansio n valve .
O-ring s fo r joints ) hav e t o b e prope r fo r refrigeran t R-134a . D o no t confus e wit h R-1 2 parts .
Us e a haloge n ga s lea k detecto r designe d fo r refrigeran t R-134a .
R-1 2 an d R-134 a refrigeran t servicin g equipmen t ar e no t interchangeable . Us e onl y a recovery/recycling/chargin g statio n
tha t i s U.L.-liste d an d is certifie d to mee t th e requirement s o f SA E J221 0 to servic e R-134 a ai r conditionin g systems .
Alway s recove r th e refrigeran t R-134 a wit h a n approve d recovery/recycling/chargin g statio n befor e disconnectin g an y
A/C fitting .
DISCHARG E LIN E (High-side )
CONDENSE R LIN E
This vehicl e use s HFC-134 a (R-134a ) refrigeran t whic h doe s no t contai n chlorofluorocarbons . Pa y attentio n t o th e follow -
in g servic e items :
CONDENSE R
EVAPORATO RPRESSUREREGULATO R
CONDENSE R
Absorption o f hea t
EVAPORATO R
SUB
CONDENSE R
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Description
Fan Contro l Uni t
The fa n contro l uni t make s calculation s base d o n signal s fro m th e radiato r fa n contro l sensor . I t the n control s th e opera -
tio n o f th e radiato r fan , condense r fa n an d A/ C system .
ON
OF F
172° F (78°C )
183°F (84°C )Whe
n engin e coolan t temperatur e is abov e 183° F (84°C) ,
th e fa n contro l uni t turn s Tr 1 ON , an d th e radiato r fa n
(Low ) an d condense r fa n run s (Low) .
ON
OF F
183° F (84°C )
When engin e coolan t temperatur e is abov e 194° F (90°C) ,
th e fa n contro l uni t turn s Tr 2 ON , an d th e radiato r fa n
(High ) runs , an d th e condense r fa n (High ) goe s on .
194° F (90°C )
ON
OF F
225° F (107°C )When engin e coolan t temperatur e is abov e 228° F (109°C) ,
the fa n contro l uni t turn s Tr 3 OFF , an d stop s th e A/ C com -
pressor .
228°F (109°C )
*1: CONDENSE R FA N RELA Y*2: RADIATO R FA N RELA Y*3: RADIATO R FA N MAI N RELA Y
RED/WH T
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A/C Pressure Switch

The A/C pressure switch consists of a High-Low pressure switch (A/C pressure switch A) and a Middle pressure switch

(A/C pressure switch B).

High-Low pressure switch

If the refrigerant pressure becomes too high (due to blockage), or too low (due to leakage), the A/C pressure switch

sends a signal to the fan control unit to prevent the compressor from operating.

ON

OFF

• Middle pressure switch

If the refrigerant pressure goes above or below 1,520 kPa (15.5 kgf/cm2, 220 psi), the A/C pressure switch sends a signal

to the fan control unit to change the speed of the condenser fan and radiator fan (High-Low).

290 kPa (3.0 kgf/cm2, 42 psi)

ON

OFF

1,230
kPa

(12.5 kgf/cm2,178 psi)
1,520
kPa

(15.5 kgf/cm2,220 psi)

MIDDLE

PRESSURE

SWITCH
HIGH-LOW

PRESSURE

SWITCHProCarManuals.com

Description
The evaporato r pressur e regulato r (EPR ) i s a pressur e contro l valve . Th e EP R is locate d behin d th e low-pressur e sid e o f th e
evaporator , an d keep s th e pressur e in th e evaporato r constant . Whe n th e evaporato r pressur e drop s belo w abou t 19 6 kP a
(2. 0 kgf/cm
2) [28. 4 psi ] th e pisto n close s t o kee p th e pressur e i n th e evaporato r abov e 19 6 kP a (2. 0 kgf/cm2) [28. 4 psi] .
Consequently , th e EP R keep s th e evaporato r temperatur e an d th e deliver y temperatur e constant .
Open
PISTO N
Close
177 20 2 kP a(1.8 0 2.0 6 kgf/cm2)[25. 6 29. 3 psi ]PRESSUR E
BELLOWSPISTON
Compresso r sid e Evaporato
r sid e
SPRIN G
Evaporato r Pressur e Regulato r (EPR )
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Troubleshooting
Symptom Char t
For electrica l malfunction s whic h ar e indicate d b y th e self-diagnosti c system , refe r t o self-diagnosi s functio n (se e nex t
page) .
NOTE :
Check th e engin e coolan t level , an d allo w th e engin e t o war m u p befor e troubleshooting .
An y abnormalit y mus t b e correcte d befor e continuin g th e test .
Becaus e o f th e precis e measurement s needed , us e a multimete r whe n testing .
Befor e performin g an y troubleshootin g procedure s check :
— Fuse s No . 3 7 (4 0 A) , No . 4 7 (2 0 A) , No . 5 0 (2 0 A) , No . 5 6 (7. 5 A ) i n th e under-hoo d fuse/rela y box , an d No . 3 (7. 5 A) , No .
5 (2 0 A ) i n th e under-das h fuse/rela y bo x
— Ground s No . G201 , G301 , G302 , G401 , G402 , G40 4
— Cleanlines s an d tightnes s o f al l connector s
Symptom
Recirculatio n contro l door s d o no t chang e betwee n FRES H an d RECIRCULATE .
Th e blowe r moto r doe s no t ru n immediatel y eve n thoug h th e engin e i s full y warme d
up . (NOTE : Th e temperatur e contro l dia l mus t b e se t betwee n 6 1 °F [18°C ] an d 89° F
[32°C]. )
No heate r an d A/ C in eithe r manua l o r AUT O modes .
Bot h fan s d o no t ru n fo r engin e coolin g (bu t the y bot h ru n wit h th e A/ C on) .
Both fan s alway s ru n a t hig h spee d fo r engin e cooling .
Both fan s alway s ru n a t hig h spee d wit h th e A/ C on .
Radiato r fa n doe s no t ru n a t hig h spee d (bu t condense r fa n run s a t hig h speed , an d
bot h fan s ru n a t lo w speed) .
Condense r fa n doe s no t ru n a t hig h spee d (bu t radiato r fa n run s a t hig h speed , an d
bot h fan s ru n a t lo w speed) .
Bot h fan s d o no t ru n a t lo w speed , an d radiato r fa n doe s no t ru n a t hig h spee d (bu t
condense r fa n run s a t hig h speed) .
Bot h fan s d o no t ru n a t low speed , an d condense r fa n doe s no t ru n a t hig h spee d
(bu t radiato r fa n run s a t hig h speed) .
Bot h fan s d o no t ru n a t lo w spee d (bu t bot h fan s ru n a t hig h speed) .
Bot h fan s d o no t ru n a t hig h spee d (bu t bot h fan s ru n a t lo w speed) .
Compresso r clutc h doe s no t engage .
Bot h fan s an d compresso r d o no t wor k a t all . Se
e pag e
22-3 4
22-3 6
22-3 7
22-3 8
22-39
22-4 0
22-41
22-42
22-4 3
22-4 4
22-47
22-48
22-4 9
22-53
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Troubleshooting
Self-diagnosis Functio n
The climat e contro l uni t ha s a self-diagnosi s function .
Runnin g th e Self-diagnosi s Functio n
Tur n th e ignitio n switc h O N (II) , an d afte r 1 minute , pres s bot h th e AUT O an d OF F button s a t th e sam e time . Whil e th e but -
ton s ar e pressed , indicato r light s A , B , C , D , E , F an d G respectivel y wil l com e o n to indicat e a fault y component .
A/C
AUT O BUTTO N
OFF BUTTO N
A
B
C
D
E
F
G
Indicator
A/C
ON
A/ C ECO N
OFF
Componen t wit h proble m
In-car temperatur e senso r
Outsid e ai r temperatur e senso r
Sunligh t senso r
Evaporato r temperatur e senso r
Ai r mi x contro l moto r
Mod e contro l moto r
Blowe r moto r Possibl
e caus e
Ope n o r shor t circuit , fault y senso r
Ope n o r shor t circuit , fault y senso r
Ope n o r shor t circuit , fault y senso r
Ope n o r shor t circuit , fault y senso r
Ope n o r shor t circuit , obstructe d door ,
fault y moto r
Ope n o r shor t circuit , obstructe d door ,
fault y moto r
Ope n o r shor t circuit , fault y moto r Se
e pag e22-1 6
22-1 8
22-20
22-2 2
22-2 4
22-26
22-28 , 22-3 0
NOTE : I n cas e o f multipl e problems , th e respectiv e indicato r light s wil l com e on . I f indicato r light s A , B , C , D , E an d F
com e o n a t th e sam e time , ther e ma y b e a n ope n in th e commo n groun d wir e o f th e sensors .
Resettin g th e Self-diagnosi s Functio n
Turnin g th e ignitio n switc h OF F wil l cance l th e self-diagnosi s function . Afte r servic e work , ru n th e self-diagnosi s functio n
onc e agai n t o chec k tha t ther e is n o othe r problem .
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Climate Contro l Uni t Input/Outpu t Signal s
8P CONNECTO R
CLIMATE CONTRO L UNI T CONNECTOR S
20P CONNECTO R
Wire sid e o f femal e terminal s
8P CONNECTO R
Terminal
No.
1
2
3
4
Wir e Colo r
BLK/YE L
PNK/BL U
GRY
WHT/YE L
Signal
IG2 POWE R
SENSO R GROUN D
AIR MIX/MOD E
POTENTIA L + 5 V
BAC K U P POWE R INPU
T
INPU T
OUTPU T
INPU T
Termina l
No.
5
6
7
8
Wir e Colo r
RED
RED/BL K
BLK
BLU/RE D
Signal
DASH LIGHT S BRIGHT -
NESS CONTROLLER
No . 4 9 (7 . 5 A ) FUS E
GROUN D
BLOWE R FEEDBAC KOUTPU
T
INPU T
OUTPU T
INPU T
20 P CONNECTO R
Terminal
No.
1
2
3
4
5
6
7
9
10
Wir e Colo r
ORN
BRN
BRN/WH T
BRN/BLK
BLU
LT GRN/RE D
RED/YEL
RED
Signa l
POWE R TRANSISTO R
BASE
EVAPORATO R TEMPER -
ATURE SENSO R
OUTSID E AI R TEMPER -
ATUR E SENSO R
IN-CAR TEMPERATUR E
SENSOR
MODE DE F
MOD E VEN T
AIR MI X HO T
AIR MI X COO L OUTPU
T
INPU T
INPUT
INPU T
OUTPU T
OUTPU T
OUTPU T
OUTPU T
Terminal
No.
11
1 2
1 4
15
16
17
18
1 9
2 0
Wir e Colo r
LT GR N
LT GRN/BL K
PNK/BL K
WHT/RE D
RED/WH T
GRN/RED
GRN/WH T
Signal
A/C PRESSUR E SWITC H
BLOWE R MOTO R
HIG H RELA Y
MOD E POTENTIA L
AI R MI X POTENTIA L
SUNLIGH T SENSO R
ENGIN E COOLAN T
TEMPERATUR E (ECT )
SENSO R
RECIRCULAT E
FRESH
INPUT
OUTPU T
INPU T
INPU T
INPUT
INPU T
OUTPU T
OUTPU T
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