1997 ACURA NSX service

A/C Syste m Servic e
Leak Tes t
Only us e servic e equipmen t tha t i s U.L.-liste d an d is cer -
tifie d t o mee t th e requirement s o f SA E J221 0 t o remov e
HFC-134 a (R-134a ) fro m th e ai r conditionin g system .
CAUTION : Exposur e t o ai r conditione r refrigeran t
an d lubrican t vapo r o r mis t ca n irritat e eyes , nos e
an d throat . Avoi d breathin g th e ai r conditione r
refrigeran t an d lubrican t vapo r o r mist .
I f accidenta l syste m discharg e occurs , ventilat e wor k
are a befor e resumin g service .
R-134a servic e equipmen t o r vehicl e ai r conditionin g sys -
tem shoul d no t b e pressur e teste d o r lea k teste d wit h
compresse d air .
Som e mixture s o f ai r an d R-134 a hav e
bee n show n to b e combustibl e a t elevate d pressure s
an d ca n resul t i n fir e o r explosio n causin g injur y o r
propert y damage . Neve r us e compresse d ai r t o pres -
sur e tes t R-134 a servic e equipmen t o r vehicl e ai r
conditione r systems.
Additiona l healt h an d safet y informatio n ma y b e obtaine d
fro m th e refrigeran t an d lubrican t manufacturers .
1 . Connec t a R-134 a refrigeran t Recovery/Recycl -
ing/Chargin g Syste m to th e vehicl e a s show n fol -
lowin g th e equipmen t manufacturer' s instructions .
NOTE: B e sur e t o instal l th e sam e amoun t o f ne w
refrigeran t oi l bac k int o th e A/ C syste m befor e
charging .
2 . Ope n hig h pressur e valv e t o charg e th e syste m to
abou t 9 8 kP a (1. 0 kgf/cm2, 1 4 psi) , the n clos e th e
suppl y valve .
3 . Chec k th e syste m fo r leak s usin g a R-134 a refriger -
an t lea k detecto r wit h a n accurac y o f 1 4 g (0, 5 oz )
pe r yea r o r better .
4. I f yo u fin d leak s tha t requir e th e syste m to b e open -
ed (t o repai r o r replac e houses , fittings , etc.) ,
recove r th e syste m accordin g t o th e Recove r Pro -
cedur e o n pag e 22-73 ).
5 . Afte r checkin g an d repairin g leaks , th e syste m
mus t b e evacuate d (se e Syste m Evacuatio n o n
pag e 22-89 ).
Recovery/Recycling/Chargin g Syste m
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Charging

Only use service equipment that is U.L.-listed and is

certified to meet the requirements of SAE J2210 to

remove HFC-134a (R-134a) from the air conditioner

system.

CAUTION: Exposure to air conditioner refrigerant

and lubricant vapor or mist can irritate eyes, nose

and throat. Avoid breathing the air conditioner

refrigerant and lubricant vapor or mist.

If accidental system discharge occurs, ventilate work

area before resuming service. Additional health and safe-

ty information may be obtained from the refrigerant and

lubricant manufacturers.

Refrigerant capacity: 850

CAUTION: Do not overcharge the system; the

compressor will be damaged.

Connect a R-134a refrigerant Recovery/Recycling/

Charging System to the vehicle as shown follow the

equipment manufacturer's instructions.
Recovery/Recycling/Charging SystemProCarManuals.com

Under-dash Fus e Bo x
Removal/Installatio n
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 in th e
SR S ( sectio n 24 ) befor e performin g repair s o r service .
Removal :
1. Disconnec t bot h th e negativ e cabl e an d positiv e
cabl e fro m th e battery .
2 . Carefull y remov e th e sid e sil l pa d (pul l i t up , rea r
en d first) .
3 . Remov e th e fus e bo x door .
FUSE BO XDOO R
SIDE SIL L PA D
SIDE SIL L TRI M
4. Remov e th e thre e screws , the n remov e th e sid e sil l
trim .
5. Remov e th e under-das h fus e bo x mountin g bolts . 6
. Disconnec t th e under-das h fus e bo x connectors .
NOTE : Th e SR S mai n harnes s connecto r i s doubl e
locked . T o remov e it , firs t lif t th e connecto r lid ,
the n pres s th e connecto r ta b dow n an d pul l th e
connecto r out .
LIDTA B
SRS MAI N HARNES S
7. Tak e ou t th e under-das h fus e box .
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Steering Loc k Removal/Installatio n
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 in th e
SR S (sectio n 24 ) befor e performin g repair s o r service .
1 . Remov e th e dashboar d lowe r cover , an d disconnec t
the connectors .
2. Remov e th e dashboar d lowe r pad .
DASHBOAR D LOWE R
COVE R
3. Remov e the tilt cover .
DASHBOAR D LOWE RPAD
TIL T COVE R
4. Remov e th e steerin g colum n lowe r an d uppe r cov -
ers. B e carefu l no t t o damag e th e steerin g colum n
covers .
UPPER COVE R
LOWE R COVE R
5. Remov e th e dashboar d brace .
DASHBOAR D BRAC E
6. Disconnec t th e ignitio n switc h 7 P an d 8 P connec -
tors.
7. Remov e th e colum n holde r mountin g bolt s an d th e
mountin g nuts , an d lowe r th e steerin g colum n
assembly . B e carefu l no t t o damag e th e SR S wir e
harness .
16 N- m(1.6 kgf-m , 1 2 Ibf-ft )
.39 N- m(4.0 kgf-m , 2 9 Ibf-ft )
(cont'd )
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Ignition Timin g Inspectio n
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 .
1 . Pul l ou t th e servic e chec k connecto r locate d unde r
th e middl e o f th e dash . Connec t th e BL U an d BRN /
BL K terminal s wit h th e SC S servic e connector .
2 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (A/ T i n o r position , M/ T i n neutral )
unti l th e radiato r fa n come s on , the n le t i t idle .
NOTE : I f yo u sto p th e engin e o r tur n th e ignitio n
switc h OF F afte r warm-u p wit h th e SC S servic e con -
necto r connected , th e engin e wil l idl e a t th e bas e
idl e speed . Tha t is , i t wil l no t b e controlle d b y th e
ECM . T o retur n t o th e norma l idl e speed , pres s th e
acclerato r peda l on e time .
SERVIC E CHEC K CONNECTO R (2P )
SC S SERVIC E CONNECTO R
07PAZ-001010 0
3. Chec k th e idl e spee d (se e pag e 23-92 ).
4 . Connec t a timin g ligh t t o th e servic e loop ; whil e th e
engin e idles , poin t th e ligh t towar d th e pointe r o n
the timin g bel t cover .
SERVIC E LOO P
TIMIN G LIGH T
5. Chec k th e ignitio n timin g wit h al l electrica l system s
ar e turne d OFF .
Ignitio n Timing : 15 ° ± 2° BTD C (RE D mark ) a t
Idl e Spee d (rpm) :
POINTE R
6. I f th e ignitio n timin g i s ou t o f spec , replac e th e ECM .
7 . Remov e th e SC S servic e connecto r fro m th e servic e
chec k connector .
CRANKSHAF T PULLE Y
RE
D MAR K
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Rectifier Test

NOTE: The diodes are designed to allow current to

pass in one direction while blocking it in the opposite

direction. Since the alternator rectifier is made up of

eight diodes (four pairs), each diode must be tested for

continuity in both directions with an ohmmeter that has

diode checking capability; a total of sixteen checks.

1. Check for continuity in each direction, between the

B and P, and between the E (ground) and P ter-

minals of each diode pair. All diodes should have

continuity in only one direction.

E (GROUND)

2. If any of the eight diodes fails, replace the rectifier

assembly. (Diodes are not available separately.)
Alternator Brush Inspection

1. Remove the end cover, then take out the brush

holder by removing its two screws.

2. Measure the length of the brushes with a vernier

caliper.

Alternator Brush Length:

Standard: 10.5 mm (0.41 in)

Service Limit: 3.5 mm (0.14 in)

ALTERNATOR BRUSHES

VERNIER CALIPER

If the brushes are less than the service limit,

replace the assembly.ProCarManuals.com

Gauge Assembl y
Gauge/Terminal Location Index
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 in th e SR S
(sectio n 24 ) befor e performin g repair s o r service .
SPEEDOMETER :Indicates 6 0 mp h [60km/h ] a t 1.02 6 [637 ]
rp m o f th e vehicl e spee d senso r (VSS) .
FUE L GAUGE :
• Gaug e test , pag e 23-13 4
• Sendin g Uni t Test , pag e 23-13 5
VOLTAG E METER :
If, wit h th e No . 5 (1 5 A ) fus eand othe r gauge s
OK , th e pointe r o f th e
voltag e mete r doe s
no t mov e a t all ,
replac e th e voltag e
meter .
TACHOMETER :Indicates 10 0 rp m a t 30 0 pulse s pe r minut eof th e ignite r unit .
COOLAN T TEMPERATUR E GAUGE :• Gaug e Test , pag e 23-13 6
• Sende r Test , pag e 23-13 6
SAFET Y INDICATO R SYSTEM :
Se e pag e 23-156 ENGIN
E OI L PRESSUR E
GAUGE:Test pag e 23-13 7
A/ T GEA R POSITIO N
INDICATO R SYSTE M
Se e pag e 23-158
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Gauge Assembl y
Removal
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 in th e
SR S ( sectio n 24 ) befor e performin g repair s o r service .
1 . Remov e th e dashboar d lowe r cover , an d disconnec t
th e floo r wir e harnes s connectors .
2 . Remov e th e tw o screws , the n remov e th e dashboar d
lowe r pa d fro m th e dashboard .
DASHBOAR DLOWERCOVER
DASHBOAR DLOWER PA D 3
. Remov e th e thre e screws , the n remov e th e til t cove r
fro m th e steerin g column .
TILT COVE R
4. Disconnec t th e connector s fro m th e instrumen t
panel switches .
5 . Remov e th e si x screws , the n remov e th e instrumen t
pane l tri m fro m th e dashboard .
INSTRUMEN T PANE L TRI M
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