1991 ACURA NSX Service Repair Manual

Solenoid Flushin g
1. Remov e th e moto r rela y fro m th e under-hoo d
fuse/rela y box . (Location : se e pag e 19-40 )
2 . Instal l th e specia l too l int o th e tw o moto r rela y cavi -
tie s i n th e rela y box .
AUXILIAR Y
WINDO W SWITC H
07KAZ-001000 A
MOTOR RELA Y
UNDER-HOO DFUSE/RELAYBOX
3. Disconnec t th e fou r modulato r solenoi d connec -
tors .
4 . Blee d an y high-pressur e flui d fro m th e maintenanc e
bleeder wit h th e specia l tool , the n retighte n th e
bleeder .
SOLENOI D UNI T
BLEEDE R T-WRENC H07HAA - SG0010 1or 07HA A-SG0010 0
ACCUMULATOR /
PRESSUR E SWITC HPOWERUNIT
MAINTENANC EBLEEDER8 x 1.2 5 mm9 N- m (0. 9 kg-m ,6.5 Ib-ft )
5. Connec t th e RE D termina l fro m on e solenoi d con -
necto r t o th e batter y positiv e (+ ) termina l wit h a
remot e starte r switch . Connec t th e BL K termina l
fro m th e sam e solenoi d t o th e batter y negativ e (- )
termina l wit h a jumpe r lea d a s shown .
SOLENOI D CONNECTOR S
FRONT-RIGH T REAR-LEF T REAR-RIGH T
FRONT-RIGHT
REMOT ESTARTE RSWITCH
6. Pres s th e auxiliar y windo w switc h t o ru n th e pump .
Afte r th e pum p ha s ru n fo r abou t fiv e seconds ,
pres s an d releas e th e remot e starte r switc h thre e o r
fou r time s t o ope n an d clos e th e solenoid . Continu e
runnin g th e pum p fo r abou t 3 0 seconds , the n
releas e th e auxiliar y windo w switc h an d ope n an d
clos e th e solenoi d anothe r thre e o r fou r times .
7. Repea t step s 4- 6 fo r th e othe r thre e solenoids .
8 . Reconnec t th e solenoid s an d th e pum p relay .
9 . Connec t th e AL B Checke r an d tur n th e Mod e Selec -
to r t o "1" . Star t th e engin e an d releas e th e parkin g
brake . Pus h th e Star t Tes t butto n o n th e AL B
Checker .
10. Whil e th e pum p i s running , plac e you r finge r ove r
th e to p o f th e solenoi d retur n tub e in th e modulato r
reservoi r an d chec k fo r leaks .
• I f a solenoi d i s stil l leaking , replac e th e
modulator/solenoi d
unit.
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Power Uni t
Torque/Inspectio n
CAUTION:
• D o no t attemp t t o disassembl e th e powe r uni t ex -
cep t fo r thos e component s show n in thi s illustration .
• D o no t spil l brak e flui d o n th e car ; i t ma y damag e th e
paint ; i f brak e flui d doe s contac t th e paint , was h i t
of f immediatel y wit h water .
• T o preven t spills , cove r th e hos e joint s wit h rag s o r
sho p towels .
• Clea n al l part s i n brak e flui d an d ai r dry ; blo w ou t al l
passage s wit h compresse d air . Befor
e reassembling , chec k tha t al l part s ar e fre e o f
dus t an d othe r foreig n particles .
Replac e part s wit h ne w one s wheneve r specifie d t o
do so .
Mak e sur e n o dir t o r othe r foreig n matte r i s allowe d
t o contaminat e th e brak e fluid .
D o no t reus e th e draine d fluid .
Us e onl y clea n DO T 3 o r 4 brak e fluid .
BANJ O BOL T(To modulator )35 N- m (3. 5 kg-m , 2 5 Ib-ft )
SEALIN GWASHER SReplaceBANJO BOL T35 N- m (3. 5 kg-m , 2 5 Ib-ft )
MAINTENANC EBLEEDER9 N- m (0. 9 kg-m , 6. 5 Ib-ft )
POWE R UNI TDo no t disassembl e
PUMP BRACKE T
6 m m FLANG E BOL T10 N- m (1. 0 kg-m , 7 Ib-ft )
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Accumulator/Pressure Switch

Index/Torque
CAUTION: Do not spill brake fluid on the car; it may damage the
paint; if brake fluid does contact the paint, wash it
off immediately with water.
To prevent spills, cover the hose jpints with rags or shop towels.
Clean all parts in brake fluid and air dry; blow out all passages with compressed air.
Before reassembling, check that all parts are free of
dust and other foreign particles. Replace parts with new ones whenever specified to

do so.

Before disassembling the accumulator unit, bleed the
high-pressure brake fluid out from the system using
the Bleeder T-wrench (see page 19-62('91-'92)('93-'96)

the Bleeder

*: CORROSION RESISTANT BOLT

Make sure no dirt or other foreign matter is allowed
to contaminate the brake fluid. Do not reuse the drained fluid.
Use only clean DOT 3 or 4 brake fluid.

NOTE: Replace the 0-ring with a new one before

reassembly. The accumulator contains high-pressure
nitrogen gas, do not puncture, expose to flame, or at-
tempt to disassemble the accumulator or it may ex-
plode; severe personal injury may result.

19 N·m
(1.9 kg-m,

14 Ib-ft)

PRESSURE SWITCH

SEALING WASHERS

Replace.

BANJO BOLT

35 N·m (3.5 kg-m, 26 Ib-ft)
6 x 1.0 mm

9 N·m
(0.9 kg-m,7 Ib-ft)
ACCUMULATOR

Disposal, page 19-68
* 6 x 1.0 mm

10 N·m (1.0 kg-m, 7 Ib-ft)

O-RING

Replace.
PRESSURE SWITCH

JOINT
6 x 1.0 mm

10 N·m
(1.0 kg-m,

7 Ib-ft)ProCarManuals.com

Accumulator/Pressure Switc h
Accumulator/Pressur e
Switc h Remova l
1. Drai n th e hig h pressur e brak e flui d fro m th e powe r
unit (se e pag e 19-62 ).
2 . Remov e thre e 6 m m flang e bolts , the n remov e th e
accumulato r fro m th e pressur e switc h joint .
6 x 1. 0 m m10 N- m (1. 0 kg-m , 7 Ib-ft )
PRESSUR E SWITC HJOINT
ACCUMULATO R
Accumulator Disposa l
The accumulato r contain s high-pressur e
nitroge n gas , d o no t puncture , expos e t o flame , o r at -
temp t t o disassembl e th e accumulato r o r i t ma y ex -
plode ; sever e persona l injur y ma y result .
1 . Secur e th e accumulato r i n a vis e s o tha t th e relie f
plug point s straigh t up .
2. Slowl y tur n th e plu g 3-1/ 2 turns , the n wai t 3 minute s
for al l pressur e t o escape .
3. Remov e th e plu g completely , an d dispos e o f th e ac -
cumulato r unit .
RELIE F PLU G
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Bleeding
Air Bleedin g wit h AL B Checke r
1. Disconnec t the 6- P inspection connector (PNK )
fro m th e connecto r cove r locate d unde r th e glov e
box , an d connec t th e 6- P inspectio n connecto r t o
th e specia l tool .
CONNECTO RCOVER
ALB CHECKE R07HAJ - SG0010 B 6-P INSPECTIO NCONNECTO R
CAUTION: Plac e th e vehicl e o n leve l groun d wit h
th e wheel s blocked . Pu t th e transmissio n in neutra l
for manua l transmissio n models , o r i n fo r auto -
mati c transmissio n models .
2 . Fil l th e modulato r reservoi r t o th e MA X leve l line .
NOTE : D o no t reus e aerate d brak e flui d tha t ha s
bee n ble d fro m th e powe r unit .
3 . Blee d high-pressur e flui d fro m th e maintenanc e
bleeder wit h th e specia l tool.BLEEDE R T-WRENC H07HAA-SG00100or07HAA-SG00101
SOLENOI D UNI T
ACCUMULATOR /PRESSURE SWITC HPOWERUNIT
MAINTENANC EBLEEDER8 x 1.2 5 mm9 N- m (0. 9 kg-m ,6.5 Ib-ft )
4. Star t th e engin e an d releas e th e parkin g brake .
NOTE : Depres s th e brak e peda l firml y whil e tes t i n
progres s ligh t i n ON .
5. Ther e shoul d b e a t leas t tw o stron g kickbacks .
I f not , repea t step s 2 throug h 5 , a s necessary .
6 . Fil l th e modulato r reservoi r u p t o th e MA X leve l
line.
RESERVOI R CA P
MAX LEVE L LIN E
7. Instal l th e reservoi r cap .
8 . Chec k th e anti-loc k brak e syste m functio n i n al l
mode s b y usin g th e AL B checker .
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ABS Contro l Uni t
Replacemen t
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 2 4 befor e performin g repair s o r service .
1 . Remov e th e dashboar d lowe r cove r an d glov e box ,
an d disconnec t th e ligh t connector .
GLOVE BO X
DASHBOAR D LOWE R COVE R
2. Mov e th e heate r duc t t o th e righ t an d remov e it .
HEATE R DUC T
3. Disconnec t th e connector s fro m th e AB S contro l uni t
b y removin g th e wir e harnes s band .
ABS CONTRO L UNI T
4. Remov e th e fou r contro l uni t attachin g bolts , the n
remov e th e bracke t wit h th e contro l unit .
5. Remov e th e AB S contro l uni t fro m th e bracket .
ABS CONTRO L UNI T
BRACKE T
CONTRO L UNI T
ATTACHIN G BOLT S
10 N-m (1.0 kg-m, 7 Ib-ft)
6. Installatio n i s th e revers e o f remova l procedure .
NOTE : Afte r installation , star t th e engin e an d mak e
sure tha t th e AB S indicato r ligh t goe s off .
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Fail-Safe Relays/Moto r Rela y
Inspectio n
1. Chec k fo r continuit y betwee n terminal s an d
There shoul d b e n o continuity .
2. Connec t a 1 2 V batter y acros s terminal s an d
There shoul d b e continuit y betwee n terminal s
and
Pulsers/Sensor s
Inspection
1. Chec k th e pulse r fo r chippe d o r damage d teeth .
2 . Measur e ai r ga p betwee n th e senso r an d pulse r al l
th e wa y aroun d whil e rotatin g th e driveshaf t b y
hand .
(A) - (B) = Standard: 0.4-1.0 mm
(0.02-0.04 in.)
NOTE: I f th e ga p exceed s 1. 0 m m (0.0 4 in) , th e
probabilit y i s a distorte d knuckl e whic h shoul d b e
replaced .
KNUCKL E
SENSOR
PULSER
ABS Control Unit
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Pulsers/Sensors
Front Senso r Replacemen t
NOTE:
• B e carefu l whe n installin g th e sensor s t o avoi d
twistin g th e wires .
• Afte r senso r replacemen t confir m prope r opera -
tion (se e pag e 19-43 ).
CORROSIO N RESISTAN T BOL T6 x 1. 0 m m10 N- m (1. 0 kg-m . 7 Ib-ft )
6 x 1. 0 m m10 N- m (1. 0 kg-m ,7 Ib-ft )
8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft )
Rear Senso r Replacemen t
8 x 1.2 5 mm22 N- m (2. 2 kg-m , 1 6 Ib-ft )
NOTE :
• B e carefu l whe n installin g th e sensor s t o avoi d
twistin g th e wires .
• Afte r senso r replacement , confir m prope r opera -
tion (se e pag e 19-43 ).
CORROSIO N RESISTAN T BOL T
6 x 1. 0 m m10 N- m (1. 0 kg-m , 7 Ib-ft )
6 x 1. 0 m m10 N- m (1. 0 kg-m ,7 Ib-ft )
6 x 1 0 m m10 N- m (1. 0 kg-m ,7 Ib-ft )
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