sensor ACURA TL 1995 Service Repair Manual

Sunlight Sensor

Replacement

1. Remove the sunlight sensor from the left tweeter

speaker grille, and disconnect the 2P connector.

NOTE: Be careful not to damage the left tweeter

speaker grille.

SUNLIGHT SENSOR

2. Install in the reverse order of removal.
Test

Turn the ignition switch ON (II). Measure the voltage

between the terminals with the (+) probe on the No. 1

terminal and the (-) probe on the No. 2 terminal with the

2P connector connected. Voltage should be;

3.7 ± 0.2 V or more with the sensor out of direct sun-

light.

3.6 ± 0.2 V or less with the sensor in direct sunlight.

NOTE: The voltage will not change under the light of a

flashlight or a fluorescent lamp.

SUNLIGHT SENSORProCarManuals.com

Evaporator Temperatur e
Sensor Powe r Transisto r
TestTes t
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 .
1 . Di p th e senso r i n ic e water , an d measur e resistance .
2 . Pou r ho t wate r o n th e sensor , an d chec k fo r chang e
i n 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
TERMINA L SID E O F MAL E TERMINAL S
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 . 1 (RED/BLK ) termina l fro m th e con -
nector .
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 .
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 . 1 (RED/BLK ) termina l fro m th e bod y
unti l th e testin g is completed .
12V 1.2-3. 4 WBUL B
No. 1 (RED/BLK )
No . 3 (BLU/RED )
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Evaporator
Replacemen t
1. Recove r th e refrigeran t wit h a Recovery/Recycling /
Chargin g Syste m (se e pag e 22-71 ).
2 . Remov e th e dashboar d lowe r cover , th e kne e bol -
ste r an d th e glov e bo x (se e sectio n 20 ).
3 . Remov e th e EC M (se e sectio n 11 ).
4 . Remov e th e AB S contro l uni t an d th e radiato r fa n
contro l modul e togethe r wit h th e bracket , the n
remov e th e TC M (se e sectio n 14 ). Remov e th e secu -
rity contro l unit .
5. Disconnec t th e connector s fro m th e powe r transis -
tor , blowe r moto r hig h relay , evaporato r tempera -
tur e sensor , blowe r moto r an d th e heate r sub-har -
ness , the n remov e th e blowe r moto r an d heate r sub -
harnes s connector s fro m th e brackets . Disconnec t
th e passenger' s airba g harnes s clip .
BLOWE R MOTO R HIG H RELA Y
EVAPORATO RTEMPERATUR ESENSORCONNECTO R
BLOWER MOTO R CONNECTO R
POWER TRANSISTO R
HEATER SUB-HARNES SCONNECTOR
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Heater Uni t
Replacemen t (cont'd )
7. Disconnec t th e connecto r fro m th e recirculatio n
contro l motor , the n remov e th e self-tappin g scre w
fro m th e pip e clamp .
PIPE CLAM P
RECIRCULATIO N CONTRO L MOTO R
8. Disconnec t th e connector s fro m th e powe r transis -
tor , blowe r moto r hig h relay , evaporato r tempera -
tur e sensor , blowe r moto r an d th e heate r sub-har -
ness , the n remov e th e heate r sub-harnes s connec -
to r fro m th e bracket .
BLOWER MOTO R HIG H RELA Y
BLOWE R MOTO R CONNECTO R
POWERTRANSISTO R
EVAPORATO RTEMPERATUR ESENSORCONNECTO R
HEATE R SUB-HARNES S
CONNECTO R
9. Remov e th e clip s fro m th e righ t an d lef t heate r
ducts , an d th e SR S mai n harnes s clip s fro m th e
heate r unit . Remov e th e thre e self-tappin g screws,
th e si x mountin g bolts , th e bracke t an d th e heate r
unit .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
HEATE R UNI T
HEATE R DUCT S
SRS MAI N HARNES S
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
10. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
Appl y sealan t t o th e grommets .
D o no t interchang e th e inle t an d outle t heate r
hoses . Mak e sur e tha t th e clamp s ar e secure .
Loose n th e blee d bol t o n th e engine , an d refil l
th e radiato r an d th e coolan t reservoi r wit h th e
prope r engin e coolan t mixtur e (se e sectio n 10 ).
Tighte n th e blee d bol t whe n al l th e trappe d ai r
ha s escape d an d engin e coolan t begin s t o flo w
fro m it (se e sectio n 10 ).
Mak e sur e tha t ther e is n o ai r leakage .
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Ignition Syste m
Descriptio n
Ignition Timin g Control :
Th e programme d ignitio n (PGM-IG ) use d i n thi s engin e provide s optimu m contro l o f ignitio n timing . A microcompute r
determine s th e timin g i n respons e t o engin e spee d an d intak e ai r flo w mass . Th e inpu t signal s ar e transmitte d b y th e
TDC/CKP/CY P sensor , throttl e positio n (TP ) sensor , engine coolant temperatur e (ECT ) sensor , an d MA F sensor . Thi s sys -
tem , whic h i s no t dependen t o n a governo r o r vacuu m diaphragm , i s capabl e o f settin g lea d angle s wit h complicate d char -
acteristic s whic h canno t b e provide d b y conventiona l governor s o r diaphragms .
Basi c Control :
The contro l uni t ha s store d withi n it th e optimu m basi c ignitio n timin g fo r operatin g condition s base d upo n engin e spee d
and intak e ai r flo w mass . Wit h compensatin g signal s fro m sensors , th e syste m determine s optimu m ignitio n timin g an d
duratio n fo r ambien t condition s an d send s voltag e pulse s t o th e ICM .
Compensatio n of ignitio n timing :
Compensatio n Ite m
Idlin g
Compensatio n a t warm-u p
ECT compensatio n Relate
d Senso r an d Informatio n
TDC/CKP/CY P senso r
MAF senso r
ECT senso r
ECT senso r
Descriptio n
Ignition timin g i s controlle d t o th e targe t spee d
wit h compensatio n accordin g t o th e idlin g speed .
La g angl e is adjuste d accordin g t o warm-u p con -
dition s t o brin g abou t a goo d balanc e betwee n
operating performanc e an d exhaus t ga s level .
Compensatio n fo r lea d angl e a t lo w engin e
coolan t temperatur e an d la g angl e a t hig h engin e
coolan t temperature .
Control a t Start :
Ignitio n timin g is fixe d a t 5 ° BTD C fo r cranking . Th e crankin g is detecte d b y th e TD C senso r (crankin g rpm ) an d starte r signal .
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Charging System

Description

To improve fuel economy, the alternator control system within the ECM changes the voltage generated at the alternator in

accordance with driving conditions.

Throttle position (TP) sensor

Engine coolant temperature

(ECT) sensor

Intake air temperature (IAT)

sensor

TDC/CKP/CYP sensor

Vehicle speed sensor (VSS)

ELD

Air conditioning signal
ECM

Alternator

STARTER SWITCH ON
Generated voltage decreases from 14.0 V to 12.5 V

AND

ELECTRICAL LOAD below 15 A

and

VEHICLE SPEED between 9 mph (15 km/h) and

44 mph (70
km/h)

and

ENGINE SPEED between 1,100 rpm and 3,000 rpm

and

ENGINE COOLANT TEMPERATURE above 176°F

(80°C)

and

A/C SWITCH OFF

and

INTAKE AIR TEMPERATURE above 65°F (18°C)
AND

FUEL CUT-OFF CON-

TROL function is not

engaged.ProCarManuals.com

Safety Indicato r
Componen t Locatio n 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 .
SAFETY INDICATO R
Troubleshooting , pag e 23-13 8
Inpu t Test , pag e 23-13 9
Bul b Replacement , pag e 23-13 8
CEILIN G LIGH T
Test/Replacement , pag e 23-17 8
FRON T PASSENGER' S DOO R SWITC H
Test , pag e 23-18 0
RIGH T REA R DOO R SWITC H
Test , pag e 23-18 0
BRAK E SWITC H
Test , pag e 23-18 4
Peda l Heigh t Adjustment ,
sectio n 1 9 HIG
H MOUN T BRAK E LIGH T
Bul b Replacement , pag e 23-18 4
TRUN K LIGH T
Test , pag e 23-18 1
DRIVER' S DOO R SWITC H
Test , pag e 23-18 0
LEFT REA R DOO R SWITC H
Test , pag e 23-18 0 TRUN
K LATC H SWITC H
Test/Replacement , pag e 23-18 1
BRAKE LIGH TFAILUR E SENSO R
Test , pag e 23-14 1
Descriptio n
Safety Indicato r System :
Bulb s ar e use d to indicat e whe n th e trun k li d o r a doo r i s no t full y closed , o r whe n a brak e ligh t i s faulty . Th e bulb s wil l remai n
O N fo r abou t tw o second s afte r th e ignitio n switc h ha s bee n turne d O N (II ) t o sho w tha t th e syste m circui t i s functioning .
Brak e Ligh t Bul b Failur e Indicator :
I f al l brak e ligh t bulb s ar e OK , th e indicato r ligh t stay s of f becaus e th e WHT/GR N wir e i s constantl y bein g grounde d b y th e
brak e ligh t failur e sensor . Wit h th e brak e ligh t off , th e ground is provide d throug h th e diode , th e failur e senso r rela y coil , an d
the bul b filaments . Wit h th e brak e ligh t on , bot h relay s in th e sensor , connecte d in series , suppl y ground . I f eithe r o f th e tw o
bulb s is no t working , th e chai n is broke n an d th e WHT/GR N wir e is no t bein g grounded . Th e indicato r ligh t come s on .
SPOTLIGH T
Test/Replacement ,
pag e 23-17 7
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Safety Indicator

Indicator Input Test (cont'd)

CONNECTOR "B" (C613): WIRE SIDE OF FEMALE TERMINALS

Trml Wire
Test condition
Test: Desired result
Possible cause if result is not obtained

B15

B16
ORN1

GRN/WHT
Trunk lid open

Right rear door open
Check for continuity to ground:

There should be continuity.

NOTE: Before testing, remove the

No. 37 (15 A) fuse from the

under-hood fuse/relay box.

Check for continuity to ground:

There should be continuity.

NOTE: Before testing, remove the

No. 37 (15 A) fuse from the

under-hood fuse/relay box.
• Faulty trunk latch switch

• An open in the wire

• Faulty door switch

• An open in the wire

CONNECTOR "C" (C614): WIRE SIDE OF FEMALE TERMINALS

Trml Wire
Test condition
Test: Desired result
Possible cause if result is not obtained

C1

C2

C3

C4

C5

C12
WHT/GRN

GRN/BLU

GRN/YEL

GRN/RED

BLK/WHT

BLK
Brake pedal pushed

Driver's door open

Left rear door open

Front passenger's door

open

Ceiling light switch in

middle position

Under all conditions
Check for continuity to ground:

There should be less than 200 ohms

with the pedal pushed.

Check for continuity to ground:

There should be continuity.

NOTE: Before testing, remove the

No. 37 (15 A) fuse from the

under-hood fuse/relay box.

Connect to ground: The ceiling

light should come on.

Check for continuity to ground:

There should be continuity.
• Blown No. 30 (20 A) fuse in the

under-dash fuse/relay box

• Faulty brake switch

• Blown brake light bulbs

• Faulty brake light failure sensor

• Poor ground (G502)

• An open in the wire

• Faulty door switch

• An open in the wire

• Blown No. 37 (15 A) fuse in the

under-hood fuse/relay box

• Faulty ceiling light

• An open in the wire

• Poor ground (G401, G404)

• An open in the wireProCarManuals.com

Brake Ligh t Failur e Senso r Tes t
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 i s blown . I f th e bul b is OK , g o t o
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 , an d pul l bac k th e lef t trun k sid e
tri m to uncove r th e failur e sensor .
3.
LEF T TAILLIGH T
FAILURESENSOR
LEFT TRUN K SID ETRIM
WIR E SID E O F FEMAL E TERMINAL S
Make 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 6 P connecto r i s grounde d an d
th e ignitio n switc h is turne d fro m OF F to O N (II) .
If th e ligh t come s o n an d stay s on ,
chec k fo r a n ope n i n th e WHT/GR N wir e betwee n
th e safet y indicato r an d th e No . 1 termina l o f th e
failur e sensor , an d whethe r th e safet y indicato r
circui t (printe d circui t board ) ha s a problem .
If th e ligh t doe s no t sta y on , g o t o
ste p 5 .
4. Mak e sur e th e ligh t doe s no t com e o n
whe n th e ignitio n switc h i s turne d fro m OF F t o O N
(II ) wit h th e No . 2 termina l of the 6 P connecto r
grounde d an d th e brak e peda l pressed .
If th e ligh t come s o n an d stay s on ,
replac e th e failur e sensor .
If th e doe s no t sta y on , chec k fo r
a n ope n in th e BL K wir e betwee n th e No . 2 termi -
na l o f th e failur e senso r an d ground , an d chec k
fo r poo r groun d a t G502 .
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Rear Speake r Replacemen t
1. Remov e th e thre e screw s fro m th e trun k side , the n
remov e th e speake r cover .
2 . Remov e th e fou r screws , the n disconnec t th e con -
necto r fro m th e speaker , an d remov e th e speaker .
NOTE : Th e illustratio n show s th e lef t rea r speaker;
th e righ t rea r speake r i s symmetrical .
SPEAKERCOVER
LEFT REA RSPEAKE R
2P CONNECTO R
3. Instal l i n th e revers e orde r o f removal .
Tweeter Replacemen t
1. Carefull y pr y th e tweete r ou t o f th e dashboard , the n
disconnec t th e 2 P connector(s ) fro m th e speake r
(an d sunligh t sensor) .
NOTE : Th e illustratio n show s th e lef t tweeter ; th e
righ t tweete r i s similar , bu t ha s n o sunligh t sensor .
LEFT TWEETE R
SUNLIGHT
SENSO R
2 P CONNECTO R
2 P CONNECTO R
2. Instal l i n th e revers e orde r o f removal .
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