1997 ACURA NSX Service Repair Manual

Sending Uni t Tes t
Do no t smok e whil e workin g o n th e fue l
system . Kee p ope n flam e awa y fro m wor k area .
1 . Remov e th e rea r bulkhea d pane l behin d th e driver' s
seat , the n remov e th e acces s panel .
2 . Wit h th e ignitio n switc h OFF , disconnec t th e 3 P con -
necto r fro m th e fue l gaug e sendin g unit .
3 . Remov e th e fiv e nuts , the n tak e th e fue l gaug e send -
in g uni t assembl y ou t o f th e fue l tank .
FUEL GAUG E SENDIN GUNIT ASSEMBL Y
4. Measur e th e resistanc e betwee n th e A an d B termi -
nal s b y movin g th e floa t t o th e height s liste d fo r E
(EMPTY) , 1/ 2 (HAL F FULL ) an d F (FULL) .
Floa t Positio n
Resistanc e
E
105-110
1/2
25.5-39. 5
F
2-5
(Botto m o f th e fue l tank )
Distanc e fro m floa t t o tan k botto m
E
1.16 in
(29. 5 mm )
1/2
5.5 5 in
(14 1 mm )
F
10.4 in
(26 3 mm )
5. I f unabl e t o obtai n th e abov e readings , replac e th e
fue l gaug e sendin g unit .
ProCarManuals.com

Coolant Temperatur e Gaug e
Coolan t Temperatur e Gaug e Tes t
1. Befor e testing , chec k th e No . 5 (1 5 A ) fus e i n th e
under-das h fus e box .
2 . Mak e sur e th e ignitio n switc h i s OFF , the n discon -
nec t th e YEL/GR N wir e fro m th e coolan t tempera -
tur e gaug e sendin g uni t an d groun d i t wit h a
jumpe r wire .
YEL/GR NWIRE
COOLAN T TEMPERATUR ESENDING UNI T
3. Tur n th e ignitio n switc h O N (II) .
Chec k tha t th e pointe r o f th e coolan t temperatur e
gaug e start s movin g towar d th e "H " mark . Tur n th e
ignitio n switc h OF F befor e th e pointe r reache s th e
"H " mar k o n th e gaug e dial ; i f yo u don't , yo u ma y
damag e th e gauge .
I f th e pointe r o f th e gaug e doe s no t swin g a t all ,
chec k for :
— An ope n in th e YE L o r YEL/GR N wire .
— Replac e th e coolan t temperatur e gaug e i f th e
fus e an d wirin g i s OK .
I f th e coolan t temperatur e gaug e is OK , chec k th e
sendin g unit .
Coolan t Temperatur e Gaug e ———
Sendin g Uni t Tes t
1. Disconnec t th e YEL/GR N wir e fro m th e sendin g
unit, an d wit h th e engin e cold , us e a n ohmmete r t o
measur e resistanc e betwee n th e positiv e termina l
an d th e engin e (ground) .
COOLAN T TEMPERATUR EGAUGE SENDIN G UNI T
2. Chec k th e temperatur e o f th e coolant .
3 . Ru n th e engine , an d measur e th e chang e i n resis -
tanc e wit h th e engin e a t operatin g temperatur e
(radiato r fa n come s on) .
Temperatur e
Resistance
133°F (56°C )
["C " mark ]
142
85° F (85°C ) -
212° F (100°C )
49-32
4. I f th e reading s yo u ge t ar e substantiall y differen t
fro m th e specification s above , replac e th e coolan t
temperatur e gaug e sendin g unit .
YEL/GR NWIRE
POSITIV ETERMINA L
ProCarManuals.com

Engine Oi l Pressur e Gaug e
Gauge Tes t
1. Befor e testing , chec k th e No . 5 (15 A ) fus e i n th e
under-das h fus e box .
2 . Mak e sur e th e ignitio n switc h i s OFF , the n discon -
nec t th e 2 P connecto r fro m th e engin e oi l pressur e
sendin g unit , an d groun d i t wit h a jumpe r wire .
BLU/WH T WIR E
ENGIN E OI L PRESSUR E
GAUGE SENDIN G UNI T
3. Tur n th e ignitio n switc h O N (II) .
Chec k tha t th e pointe r o f th e engin e oi l pressur e
gauge start s movin g towar d th e "8 " mark .
CAUTION : Tur n th e ignitio n switc h OF F befor e th e
pointe r reache s th e "8 " mar k o n th e gaug e dial ; i f
yo u don't , yo u ma y cause damag e t o th e gauge .
I f th e pointe r o f th e gaug e doe s no t mov e a t all ,
chec k for :
— A n ope n i n th e YE L o r BLU/WH T wire .
— Replac e th e engin e oi l pressur e gaug e i f th e
wirin g i s OK .
I f th e engin e oi l pressur e gaug e i s OK , g o o n t o
ste p 4 .
4 . Chec k th e engine-oi l pressur e (se e sectio n 8 ).
I f th e engin e oi l pressur e i s OK , replac e th e en -
gin e oi l pressur e sendin g unit .
Engin e Oi l Pressur e
Warning Syste m
Engine Oi l Pressur e Switc h Tes t
1. Rais e th e car , an d plac e safet y stand s i n th e prope r
location s (se e sectio n 1 ).
2 . Remov e th e righ t rea r tire .
3 . Remov e th e YEL/RE D wir e fro m th e engin e oi l pres -
sur e switch .
ENGINE OI L PRESSUR E SWITC H
4. Chec k continuit y betwee n th e positiv e termina l an d
engin e (ground ) wit h th e engin e off .
I f ther e i s n o continuity , th e switc h i s OK .
If ther e is continuity , d o no t replac e th e switch ;
first chec k othe r possible causes i n ste p 6 .
6. Mak e sur e engin e oi l leve l i s OK , the n chec k engin e
oil pressur e (se e sectio n 8 ).
If engin e oi l pressur e is OK , replac e th e engin e oi l
pressur e switch .
If oi l pressur e i s low , remove , inspect , and , i f
necessary , replac e th e oi l pum p (se e sectio n 8 ).
ProCarManuals.com

Parking Brak e Switc h Tes t
Brak e Warnin g Syste m
1. Remov e th e cente r console , an d disconnec t th e con -
necto r fro m th e switch .
2. Chec k continuit y betwee n th e positiv e termina l an d
bod y groun d wit h th e brak e leve r u p an d down .
• Ther e shoul d b e n o continuit y wit h th e brak e leve r
down .
• Ther e shoul d b e continuit y wit h th e brak e leve r
up.
Brak e Flui d Leve l Switc h Tes t
1. Remov e th e reservoi r cap . Chec k tha t th e floa t
move s u p an d dow n freely ; i f i t doesn't , replac e th e
reservoi r cap assembly .
NOTE: (Canada )
If th e parkin g brak e switc h i s OK , bu t th e brak e
warnin g syste m doe s no t work , mak e th e inpu t
test fo r th e daytim e runnin g light s contro l uni t
(se e pag e 23-182 ).
2 . Chec k fo r continuit y betwee n th e terminal s wit h th e
floa t u p an d down .
There shoul d b e continuit y with the floa t dow n an d
no continuit y wit h th e floa t up ; i f continuit y is incor -
rect, replac e th e reservoi r ca p assembly .
ProCarManuals.com

Seat Bel t Reminde r Syste m
Seat Bel t Switc h Tes t
1. Slid e th e driver' s sea t al l th e wa y forward , the n dis -
connec t th e 2 P connecto r fro m th e sea t bel t switch .
2 . Chec k continuit y betwee n th e A an d B terminal s wit h
th e driver' s sea t bel t buckle d an d unbuckled .
Ther e shoul d b e n o continuit y wit h th e driver' s
sea t bel t buckled .
Ther e shoul d b e continuit y wit h th e sea t bel t un -
buckled .
CENTERBUCKL E
DRIVER' S SEA T
View fro m wir e sid e
Low Fue l Indicato r
Indicator Ligh t Tes t
1. Par k th e ca r o n leve l ground .
D o no t smok e whil e workin g o n th e
fue l system . Kee p ope n flam e awa y fro m th e wor k
area . Drai n fue l onl y int o a n approve d container .
2 . Remov e th e drai n bol t fro m th e fue l tank , an d drai n
th e fue l int o a n approve d container .
The n instal l th e drai n bol t wit h a ne w washer .
3. Ad d les s tha n 1 1 (2. 9 U.S . Gal , 2. 4 Imp . Gal ) o f
fue l an d tur n th e ignitio n switc h on . Th e lo w fue l in -
dicato r ligh t shoul d com e o n withi n fou r minutes .
If i t does , g o t o ste p 4 .
I f i t doesn't , g o t o ste p 5 .
4. Ad d 4 o f fue l (1. 1 U.S . Gal , 0.8 8 Imp . Gal) . Th e
light shoul d g o of f withi n fou r minutes .
5. I f th e ligh t di d no t com e o n i n ste p 3 remov e th e
rea r bulkhea d pane l behin d th e driver' s seat , the n
remov e th e acces s panel , an d disconnec t th e 3 P
connecto r fro m th e fue l gaug e sendin g unit .
Connec t th e A (BLK ) termina l t o th e C (YEL/BLU ) ter -
mina l wit h a jumpe r wire .
I f th e ligh t come s on , th e proble m is eithe r th e
sendin g uni t o r it s ground .
I f th e ligh t doe s no t com e on , th e proble m is a n
ope n in th e C (YEL/BLU ) wir e to th e gaug e assem -
bly , o r n o powe r t o th e gauge , o r a ba d bulb .
ACCES SPANEL
3P CONNECTO R
B (YEL/WHT )
C (YEL/BLU )
A (BLK)
View fro m wir e sid e
ProCarManuals.com

Interlock Syste m
Componen t Locatio n Inde x
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 .
INTERLOC K CONTRO L UNI T
Inpu t Test , pag e 23-14 3
ProCarManuals.com

PARKING PI N SWITC H
Test , pag e 23-14 6
Replacement , pag e 23-14 6
A/ T GEA R POSITIO N SWITC H
Test , pag e 23-16 2
Replacement , pag e 23-16 3
KE Y INTERLOC K SOLENOI D
an d KE Y INTERLOC K SWITC H
(I n th e steerin g loc k assembly )
Test , pag e 23-14 4 SHIF
T LOC K SOLENOI D
Test , pag e 23-14 5
Replacement , pag e 23-14 5
ProCarManuals.com

Control Uni t Inpu t Tes t
INTERLOC K CONTRO L UNI TDisconnec t th e 8 P connecto r fro m th e contro l unit .
Inspec t th e connecto r an d socke t terminal s t o b e sur e
the y ar e al l makin g goo d contact .
I f th e terminal s ar e bent , loose , o r corroded , repai r
the m as necessary , an d rechec k th e system .
I f th e terminal s loo k OK , mak e th e followin g inpu t
test s a t th e connector .
— If a tes t indicate s a problem , fin d an d correc t th e
cause , the n rechec k th e system .
— If al l th e inpu t test s prov e OK , th e contro l uni t
mus t b e faulty ; replac e it .
NOTE : I f th e shif t loc k solenoi d click s whe n yo u ste p
o n th e brak e peda l wit h th e ignitio n switc h O N (II )
(the shif t leve r i n position) , th e shif t loc k syste m is
electronicall y OK . I f th e shif t leve r canno t b e shifte d
from position , se e pag e 23-16 2 an d sectio n 14 .
Shif t Loc k System :
Wir e Tes t conditio n Test : Desire d resul t
8P CONNECTO R
BLK
YEL/BL K
WHT/BL K
View fro m wir e sid ePossibl e caus e if resul t i s no t obtaine d
ORN/BL K
GRY/WH T
YEL/BLK
Ignition switc h O N (II )
Brak e peda l pushe d
Ignitio n switc h O N (II) ;
ste p o n th e brak e peda l
and th e accelerato r a t
the sam e time .
Shift leve r i n positio n
Ignitio n switc h O N (II ) Chec
k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage .
Chec k fo r voltag e t o ground :
Ther e shoul d no t b e batter y voltage .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity .
Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage . •
Blow n No . 4 5 (2 0 A ) fus e
• Fault y brak e switc h
• Fault y throttl e positio n (TP ) senso r
• Fault y transmissio n contro l modul e
(TCM)
• A n ope n i n th e wir e
• Fault y A/ T gea r positio n switc h
• Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
• Blow n No . 5 (1 5 A ) fus e
• Fault y shif t loc k solenoi d
• A n ope n i n th e wir e
Ke y Interloc k System :
WireTes t conditio n
Test: Desire d resul t Possible caus e if resul t i s no t obtaine d
BLK
GRY/WH T
WHT/RE D
BLK/RED
WHT/BL K
Under al l condition s
Shift leve r i n positio n
Ignitio n switc h turne d t o
AC C (I ) an d th e ke y
pushe d al l th e wa y i n
Ignitio n switc h turne d t o
AC C (I ) an d th e ke y
pushe d al l th e wa y in
Shif t leve r i n pus h
butto n presse d
Shift leve r i n pus h
butto n release d Chec
k fo r continuit y t o ground :
Ther e shoul d b e continuity .
Check fo r continuit y t o ground :
There shoul d b e continuity .
Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage .
Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity .
Chec k fo r continuit y t o ground :
Ther e shoul d b e n o continuity . •
Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
• Fault y A/ T gea r positio n switc h
• Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
• Blow n No . 4 5 (2 0 A ) fus e
• Fault y steerin g loc k assembl y (ke y
interloc k solenoid )
• A n ope n i n th e wir e
• Blow n No . 4 5 (2 0 A ) fus e
• Fault y steerin g loc k assembl y (ke y
interloc k switch )
• A n ope n in th e wir e
• Fault y parkin g pi n switc h
• Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
• Fault y parkin g pi n switc h
• Shor t t o groun d
ProCarManuals.com