1991 ACURA NSX charging

Charging Syste m
Componen t Locatio n Inde x
CHARGIN G SYSTE M LIGH T(Built int o th e gaug e assembly )Test, pag e 23-10 0
BATTER YTest, pag e 23-6 8
ALTERNATO R BEL TAdjustment , pag e 23-10 9
ALTERNATO R• Alternato r an d Regulato r Test , pag e 23-10 2
• Replacement , pag e 23-10 5
• Overhaul , pag e 23-10 6
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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 i s dea d o r low , tes t th e followin g item s i n th e orde r listed :
1. Batter y (se e pag e 23-68 )
2. Chargin g Syste m Ligh t
3. Alternator/Regulato r
Charging Syste m Ligh t Tes t
Does th e chargin g syste m ligh tcom e on ?
Star t th e engine .
Doe s th e chargin g syste m ligh t
go off ?
Turn th e ignitio n switc h off .
Disconnec t th e 4- P connecto r
fro m th e alternator .
Tur n th e ignitio n switc h O N (II) .
WHT/BL U wir e i s OK ; perfor m
alternator/regulato r tes t (se e pag e
23-102 ).
Doe s th e chargin g syste m ligh t
com e on ? (T
o pag e 23-101 )
Chargin g syste m ligh t circui t i s
OK .
Disconnec t th e AB S contro l uni t
(C237) , EP S contro l uni t (C251) ,
an d th e integrate d contro l uni t
(C401) , a s applicable . I f th e
chargin g syste m ligh t stay s on ,
repai r th e shor t t o groun d i n th eWHT/BL U wire .
Tur
n th e ignitio n switc h O N (II) .
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Charging System

Troubleshooting

Alternator/Regulator Test

Use the SUN VAT-40 (or equivalent) tester.
2. Attach the negative tester cable and the voltmeter

negative lead to the top of the intake manifold.

LOAD ADJUSTER

(CARBON PILE)
FULL FIELD

LEAD (BLU)

VOLTMETER

NEGATIVE

LEAD (BLK)

VOLT

SELECTOR

FIELD

SELECTOR

INDUCTIVE

PICK-UP

(GRN)
POSITIVE

CABLE (RED)
NEGATIVE

CABLE (BLK)
VOLTMETER

POSITIVE

LEAD (RED)

1. Attach the positive tester cable and the voltmeter

positive lead to the jump start terminal in the

engine compartment fuse/relay box.

POSITIVE CABLE

VOLTMETER

POSITIVE LEAD

JUMP

START

TERMINAL

- ENGINE COMPARTMENT

FUSE/RELAY BOX
VOLTMETER

NEGATIVE LEAD
NEGATIVE CABLE

NEGATIVE MARK

3. Attach the inductive pick-up to the B terminal wire

of the alternator with its arrow pointing away from

the terminal.

NOTE: The arrow must point away from the B

terminal.

INDUCTIVE PICK-UP

ARROW
ALTERNATOR

B TERMINAL

ALTERNATOR
TEST SELECTOR

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NOTE: B e sur e th e batter y is sufficientl y charge d
(see pag e 23-68 ).
Connec t th e Su n VAT-4 0 (se e
pag e 23-102 ) an d tur n th e selec -
to r switc h t o positio n 1 (star -
ting) .
Star t th e engin e an d le t i t idl e un -
ti l i t reache s norma l operatin g
temperature .
Raise th e engin e spee d t o 2,00 0rpm an d hol d i t there .
Is th e voltag e ove r 15. 1 V ?
Releas e th e accelerato r peda l
and le t th e engin e idle .
Mak e sur e al l accessorie s ar eturne d off . Tur n th e selecto rswitch t o positio n 2 (charging) .
Remove th e inductiv e pick-u p
an d zer o th e ammeter .
Attach th e inductiv e pick-u p t oth e B termina l wir e o f th ealternato r wit h it s arro w pointin gaway fro m th e terminal .
Rais e th e engin e spee d t o 2,00 0
rpm an d hol d i t there .
Is th e voltag e les s tha n 13. 9 V ?
(T o pag e 23-104 ) Replac
e th e voltag e regulator .
Tes t th e batter y (se e pag e23-68).
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Charging Syste m
Troubleshootin g
(From pag e 23-103 )
Appl y a loa d wit h th e VAT-4 0
unti l th e batter y voltag e drop s t o
betwee n 12-13. 5 V .
Is th e amperag e 8 5 A or more ?
With th e engin e spee d stil l a t2,00 0 rpm , full-fiel d th e alter -nator.
Turn th e ignitio n switc h off .
Disconnec t th e 4- P connecto r
fro m th e alternator .
Tur n th e ignitio n switc h O N (II) .
Chec k fo r voltag e in th e YE L wir e
a t th e I G termina l an d i n th e
WHT/GR N wir e a t th e S termina l
o f th e 4- P connector .
I s ther e batter y voltag e in bot h
wires ?
Chargin g syste m is OK .
NOTE : Attac h a prob e to th e VAT-4 0 full-fiel d tes t
lead , an d inser t th e prob e int o th e full-fiel d acces s
hole a t th e bac k o f th e alternator . Switc h th e fiel d
selecto r t o " A (Ground) " positio n momentarily , an d
chec k th e amperag e reading .
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 le t i t excee d 18 V
o r yo u ma y damag e th e electrica l system .
FULL-FIEL D ACCES S HOL E
END COVE R
REGULATO R(Located insid e th e en d cove r
I s th e alternato r outpu t 8 5 A or
more ?Test an d repai r th e alternato r
(se e pag e 23-106 ).
IG (YEL )
S (WHT/GRN )
Repair ope n in th e YE L wir e o r th eWHT/GR N wire .
Replac e th e voltag e regulator .
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Charging Syste m
Alternato r Overhau l
NOTE: I t i s onl y necessar y t o separat e th e pulley , driv e
end housin g an d roto r whe n th e fron t bearin g need s
replacement .
Loosen th e locknu t wit h 1 0 m m an d 2 2 m m wrenche s
to remov e th e pulle y fro m th e rotor . I f necessary , us e a n
impac t wrench .
TERMINA L INSULATO R
PULLEY
22 m m BO XWRENC H
10 m m BO X WRENC H
EN D COVE R PULLE
Y LOCKNU T
11 5 N- m (11. 5 kg-m , 8 3 Ib-ft )
REA R HOUSIN G ASSEMBLY
BRUS H HOLDE R
INSULATO R
BRUSHE S
Inspection , pag e 23-10 7
SPACE R RIN G
REA R BEARIN GDIOD
E (RECTIFIER ) ASSEMBL YTest, pag e 23-10 7
INSULATO R SLEEV E
BEARIN G RETAINE R
STATO R THROUG H BOL T
Do no t disassemble .
STATOR ASSEMBLY/DRIV E EN D HOUSIN GTest, pag e 23-10 8
PULLE Y LOCKNU T115 N- m(11. 5 kg-m , 8 3 Ib-ft )
ROTO RTest, pag e 23-10 8
CAUTION : D o no t ge t greas e
o r oi l o n th e sli p rings .
FRONT BEARIN G
PULLEY
BRUSH HOLDE R
VOLTAG E REGULATO R
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Charging System

Rotor Slip Ring Test

1. Check that there is continuity between the slip rings.

2. Check that there is no continuity between the slip

rings and the rotor or rotor shaft.

ROTOR SHAFT

SLIP RINGS
ROTOR

3. If the rotor fails either continuity check, replace the

alternator.
Stator Test

1. Check that there is continuity between each pair of

leads.

2. Check that there is no continuity between each lead

and the coil core.

LEADS

COIL CORE

3. If the coil fails either continuity check, replace the

alternator.ProCarManuals.com

Gauge Assembly

Bulb Locations

GAUGE LIGHTS (1.4W x 2)

SRS INDICATOR LIGHT (1.4 W)

RIGHT TURN SIGNAL INDICATOR LIGHT (1.4 W)

EPS INDICATOR LIGHT (1.4 W)

BRAKE SYSTEM LIGHT (1.4 W)

SEAT BELT REMINDER LIGHT (1.4 W)

TCS INDICATOR

LIGHT (1.96 W)

LOW FUEL INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

(1.4
W)
HIGH BEAM INDICATOR LIGHT (1.4 W)

LEFT TURN SIGNAL INDICATOR LIGHT (1.4 W)

ABS

INDICATOR LIGHT (1.4 W)

CHARGING SYSTEM LIGHT (1.4 W)

MALFUNCTION

INDICATOR

LAMP (MIL)

(1.4W)

LOW OIL PRESSURE

INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

(1.4
W)

GAUGE LIGHT

(3.0
W)
GAUGE LIGHT

(3.0
W)
GAUGE LIGHT

(3.0
W)
CRUISE INDICATOR LIGHT

(1.96
W)ProCarManuals.com