1995 ACURA TL Service Repair Manual

Charging Syste m
Componen t Locatio n Inde x
CHARGIN G SYSTE M LIGH T
(I n th e gaug e assembly )
Test , pag e 23-9 6
Bul b Locations , pag e 23-11 5
BATTER YTest, pag e 23-6 0
ALTERNATO RAlternator an d Regulato r Test , pag e 23-9 8
Replacement , pag e 23-10 0
Overhaul , pag e 23-10 1 ALTERNATO
R BEL T
Inspectio n an d Adjustment , pag e 23-10 4
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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

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Charging Syste m
Troubleshootin g
If th e chargin g syste m ligh t i s on , o r th e batter y is dea d o r low , tes t th e followin g item s in th e orde r liste d below .
1. Batter y (se e pag e 23-60 )
2. Chargin g Syste m Ligh t
3. Alternator/Regulato r
Check th e No . 4 (1 5 A)*1 o r (2 0A)*2 fus e i n th e under-das h fuse /
rela y box .
I s th e fus e OK ?
Chec k fo r a n ope n in th e L circuit :
1 . Disconnec t th e 4 P connecto r
from th e alternator .2. Groun d th e No . 4*1 o r No . 3*2
termina l o f th e 4 P connector .3. Tur n th e ignitio n switc h O N(II).
Doe s th e chargin g syste mlight com e on ?
4. Disconnec t th e No . 4*1 o r No .
3*2 termina l o f th e 4 P connec -tor fro m th e ground .
Does th e chargin g syste m
ligh t g o off ?
Doe s th e chargin g syste m
ligh t sta y off ?
(T o page 23-97) Replac
e th e fuse .
Chec k fo r a blow n chargin g sys -
te m ligh t bulb . I f th e bul b i s OK ,
repai r th e ope n i n th e WHT/BL U
wire .
Th e chargin g syste m ligh t circui tis OK .
Turn th e ignitio n switc h OFF , an d
repai r th e shor t t o groun d i n th e
WHT/BL U wire .
ALTERNATO R 4 P CONNECTO R
'95 - 9 6 model s '9 7 - 9 8 model s
*1 : '9 5 -9 6 model s
*2 : '9 7 - 9 8 model s WIR
E SID E O F FEMAL E TERMINAL S
ALTERNATO R 4 P CONNECTO R
'95 - 9 6 model s '9 7 - 9 8 model s
WIR E SID E O F FEMAL E TERMINAL S
Chec
k fo r a shor t t o bod y groun d
i n th e L circuit :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e AB S contro l uni t
(C447)*1 an d integrate d contro l
uni t (C401) , a s applicable .
3. Tur n th e ignitio n switc h O N(II) .
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(From page 23-96 )
Chec k fo r shor t i n contro l unit(s) :
1 . Tur n th e ignitio n switc h OFF .
2 . Reconnec t th e AB S contro l
uni t connector .
3 . Tur n th e ignitio n switc h O N
(II) , an d chec k th e chargin g
system light .4. Tur n th e ignitio n switc h OF Fagain .5. Reconnec t th e integrate d con -trol uni t connector .6. Tur n th e ignitio n switc h O N
(II) , an d chec k th e chargin g
system ligh t again .
Did th e ligh t sta y of f whe n yo u
turne d o n th e ignitio n switc h afte r
connectin g eac h contro l uni t con -
nector ?
Check fo r a n ope n in th e IG circuit :
Measur e th e voltag e a t th e No .
3*
1 o r No . 1*2 termina l o f th e 4 Pconnector .
ALTERNATO R 4 P CONNECTO R
'95-96 model s '97-9 8 model s
Replac e th e contro l uni t tha t
cause d th e ligh t t o com e on .
WIR E SID E O F FEMAL E TERMINAL S
Is ther e batter y voltage ? Tur
n th e ignitio n switc h OFF , an d
repai r th e ope n circui t i n th e BLK /YEL wire .
Chec k th e Alternator/Regulator :1. Connec t th e 4 P connecto r t o
th e alternator .
2 . Tur n th e ignitio n switc h O N
(II).
Doe s th e chargin g syste m
ligh t com e on ? Chec
k th e alternator/regulato r(see pag e 23-98 ).
3 . Star t th e engine .
Doe s th e chargin g syste m
ligh t g o off ? Chec
k th e alternator/regulato r
(see pag e 23-98 ).
Th e chargin g syste m ligh t circui tis OK .
*1: '9 5 -9 6 model s*2: '9 7 - 9 8 model s
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Charging Syste m
Troubleshootin g (cont'd )
NOTE: B e sur e th e batter y is sufficientl y charge d (se e pag e 23-60 ).
Alternator/Regulato r Test-1 :
1 . Connec t th e Su n VAT-4 0 (o r
equivalen t tester) , an d tur n
th e selecto r switc h t o positio n
1 (starting) .
2. Shif t t o o r position , an d
star t th e engine . Hol d th e
engin e a t 3,00 0 rp m wit h n o
loa d unti l th e radiato r fa ncome s on , the n le t i t idle .
3 . Rais e th e engin e spee d t o
2,00 0 rpm , an d hol d i t there .
I s th e voltag e ove r 15. 1 V ?
I s th e voltag e les s tha n 13. 5 V ? LOA
D ADJUSTE R
(CARBON PILE )
FULL FIEL DTESTE RLEAD (BLU )
VOLTMETE RNEGATIVELEAD (BLK )
VOLTSELECTO R
FIELDSELECTO R
B TERMINA LWIRE
INDUCTIV EPICK-UP
VOLTMETE RPOSITIVELEAD (RED )
NEGATIV E TESTE RCABLE (BLK )
POSITIV E TESTE RCABLE (RED )
Replac e th e voltag e regulator .
Tes t an d repai r th e alternato r com -
ponents .
(T o page 23-99) INDUCTIV
E
PICK-UP(GRN)
TEST SELECTO RSWITCH
Alternator/Regulato r Test-2 :
1 . Releas e th e accelerato r pedal ,
an d le t th e engin e idle .
2 . Mak e sur e al l accessorie s ar e
turne d off . Tur n th e selecto r
switc h t o positio n 2 (charging) .
3 . Remov e th e inductiv e pick-up ,
an d zer o th e ammeter .
4 . Plac e th e inductiv e pick-u p
ove r th e B termina l wire of th e
alternato r s o tha t th e arro w
points awa y fro m th e alterna -tor.5. Rais e th e engin e spee d t o
2,00 0 rpm , an d hol d i t there .
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(From page 23-98)
I s th e amperag e 7 5 A or more ? The chargin g syste m is OK .
Alternator/Regulato r Test-4 :
With th e engin e spee d stil l a t2,00 0 rpm , full-fiel d th e alternator . CAUTION
: Th e voltag e wil l ris e quickl y whe n th e alternato r i s full-fielded . D o no t allo w
th e voltag e to excee d 1 8 V ; i t ma y damag e th e electrica l system .
NOTE : Attac h a prob e t o th e VAT-4 0 ful l fiel d tes t lead , an d inser t th e prob e int o th e ful l
fiel d acces s hol e a t th e bac k o f th e alternator . Switc h th e fiel d selecto r t o th e " A (Ground) "
positio n momentarily , an d chec k th e amperag e reading .
END COVE R
Is th e alternato r outpu t 7 5 A ormore ? Tes
t an d repai r th e alternato r com -ponents .
ALTERNATO R 4 P CONNECTO R
'95-96 model s '97-9 8 model s
BLK/YE L Wir e Test :
1 . Tur n th e ignitio n switc h OFF ,
the n tur n i t o n (II ) again .
2 . Disconnec t th e 4 P connecto r
from th e alternator .3. Chec k fo r voltag e a t th e No . 3 *'or No . 1*2 termina l o f th e 4 Pconnector .
I s ther e batter y voltage ? Repai
r th e ope n in th e BLK/YE L
wire .
*1:'95-9 6 model s*2: '9 7 - 9 8 model s
23-99
FULL FIEL DACCES S HOL E
REGULATO R(Located insid ethe en d cover )
WIRE SID E O F FEMAL E TERMINAL S
Replac e th e voltag e regulator .
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Charging Syste m
Alternato r Replacemen t
1. Mak e sur e yo u hav e th e anti-thef t cod e fo r th e radio ,
the n writ e dow n th e frequencie s fo r th e radio' s pre -
set buttons .
2. Disconnec t th e batter y negativ e cable , the n discon -
nec t th e positiv e cable .
3 . Disconnec t th e 4 P connecto r fro m th e alternator .
4 . Remov e th e termina l nu t an d BL K wir e fro m th e B
terminal .
B TERMINA L
BLK WIR E
4P CONNECTO R
5. Loose n th e throug h bolt , the n loose n th e adjustmen t
loc k bolt , an d the n th e adjustin g nut .
ADJUSTIN G NU T
8 N- m (0. 8 kgf-m , 6 Ibf-ft )
THROUG H BOL T ADJUSTMEN T LOC K BOL T
4 4 N- m (4. 5 kgf-m , 3 3 Ibf-ft ) 2 2 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
6. Remov e th e bel t fro m th e alternator .
7 . Remov e th e adjustmen t loc k bol t an d th e throug h bolt ,
the n remov e th e alternator .
8 . Instal l i n th e revers e orde r o f removal .
9 . Adjus t th e alternato r bel t tensio n (se e pag e 23-105 ).
10 . Ente r th e anti-thef t cod e fo r th e radio , the n ente r th e
customer' s radi o statio n presets .
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Alternator Overhau l
NOTE: D o no t remov e th e pulle y unles s th e fron t bear -
in g need s replacement .
T o loose n th e pulle y locknut , us e th e tool s a s shown . I f
necessary , us e a n impac t wrench .
END COVE R
TERMINA L INSULATO R
BRUSH HOLDE RINSULATO R
BRUSH ASSEMBL Y
Inspection , pag e 23-10 2
VOLTAG E
REGULATO R
SPACER RIN G
REA R BEARIN G PULLE
Y
22 m m BO XWRENC H
10 m m BO X WRENC H
PULLEY LOCKNU T
11 1 N- m (11. 3 kgf-m , 81. 7 Ibf-ft )
RECTIFIE R ASSEMBL Y
Test , pag e 23-10 2
REAR HOUSIN G
Do no tdisassemble .
BEARING INSULATO R
STATOR THROUGH-BOL T
STATOR ASSEMBLY/DRIV E EN D HOUSIN G
Test , pag e 23-10 3
PULLE Y LOCKNU T
11 1 N- m (11. 3 kgf-m , 81. 7 Ibf-ft )
CAUTION : D o no t ge t greas e
or oi l o n th e sli p rings .
FRONT BEARIN G
PULLEY
ROTO
R
Test , pag e 23-10 3 INSULATO
R SLEEV E
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