ABS ACURA NSX 1991 Service Repair Manual

General Info
Specifications
Maintenance
Engine
Cooling
Fuel and Emissions
’91’92 Models
’93’94 Models
’95’96 Models
*TransaxleSuspension
*Brakes (Including ABS)
*Body
*Heating, Ventilation and
Air Conditioning
*Body Electrical
*Engine Electrical
*SRS
1991-96 NSX Main Menu
As sections w/ * include SRS components,
special precautions are required when servicing.
Steering
’91’94 Models
’95’96 Models
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Warning/Caution Labe l Location s
SRS CAUTIO N LABELS : Refe r t o pag e 1- 6
FROZE NBATTER Y CAUTIO N
AI R CONDITIONIN G
R-134 a CAUTIO N
(U.S.A. only )
ENGIN E COOLAN TCAUTION • PRECAUTIO N
ABS CAUTIO N
ABS an d BRAK EFLUID CAUTIO N
RETRACTABL EHEADLIGHT CAUTIO N
EMISSION CONTRO L
INFORMATIO N an d
VACUU M HOS E
ROUTIN G DIAGRA M
BATTERYCAUTION
RADIATO R BLEE DPLUG CAUTIO N
EXPANSIO NTANK CA PCAUTIO N
SPAR K PLU G
CAUTIO N
TIRE INFORMATIO N
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System Descriptio n
Vacuum Connection s (cont'd )
Control Bo x
EVAPORATIV E EMISSIO N
(EVAP ) PURG E CONTRO L SOLENOI D VALVE
EXHAUS T GA S RECIRCULATIO N
(EGR ) CONTRO L SOLENOI D VALVE EXHAUS
T GA S RECIRCULATIO N (EGR )
VACUU M CONTRO L VALV E
MANIFOL D ABSOLUT E
PRESSUR E (MAP ) SENSO R
INTAK E AI R BYPAS S
(IAB ) CONTRO L SOLENOI D
VALVETroubleshooting ,
pag e 11-15 5
INTAK E AI R BYPAS S (IAB ) CHEC K VALV E
INTAKE AI R BYPAS S (IAB ) VACUU M TAN K
For Troubleshooting of DTC related components, see chart on page 11-52.
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Vacuum hos e No .
FRON T PRIMAR Y HEATE D OXYGE N SENSO R (HO2S )
(BAN K 2 , SENSO R 1 )
REA R PRIMAR Y HEATE D OXYGE N SENSO R (HO2S )
(BAN K 1 , SENSO R 1 )
FRON T SECONDAR Y HEATE D OXYGE N SENSO R (HO2S )
(BAN K 2 , SENSO R 2 )
REA R SECONDAR Y HEATE D OXYGE N SENSO R (HO2S )(BANK 1. SENSO R 2)MANIFOL D ABSOLUT E PRESSUR E (MAP ) SENSO R
ENGIN E COOLAN T TEMPERATUR E (ECT ) SENSO R
INTAK E AI R TEMPERATUR E (IAT ) SENSO R
FRON T KNOC K SENSO R (KS2 )
REA R KNOC K SENSO R (KS1 )
AI R CLEANE R (ACL )
FUE L INJECTO R
FUE L PRESSUR E REGULATO R
FUE L FILTE R
FUE L PUM P (FP )
FUEL TAN KFUEL TAN K EVAPORATIV E EMISSIO N (EVAP ) VALV E
INTAK E AI R BYPAS S (IAB ) CHEC K VALV E INTAK
E AI R BYPAS S (IAB ) VACUU M TAN K
INTAK E AI R BYPAS S (IAB ) CONTRO L SOLENOI D VALV E
INTAK E AI R BYPAS S (IAB ) CONTRO L DIAPHRAG M
FRON T THRE E WA Y CATALYTI C CONVERTE R (TWC )
REA R THRE E WA Y CATALYTI C CONVERTE R (TWC )
POSITIV E CRANKCAS E VENTILATIO N (PCV ) VALV E
EXHAUS T GA S RECIRCULATIO N (EGR ) VALV E
EXHAUS T GA S RECIRCULATIO N (EGR ) VALV E LIF T SEN -
SOREXHAUS T GA S RECIRCULATIO N (EGR ) VACUU M CONTRO LVALVEEXHAUS T GA S RECIRCULATIO N (EGR ) CONTRO L
SOLENOI D VALV E
EVAPORATIV E EMISSIO N (EVAP ) CONTRO L CANISTE R
EVAPORATIV E EMISSIO N (EVAP ) PURG E CONTRO L
SOLENOI D VALV E
EVAPORATIV E EMISSIO N (EVAP ) PURG E CONTRO L
DIAPHRAG M VALV E
EVAPORATIV E EMISSIO N (EVAP ) PURG E FLO W SWITC H
EVAPORATIV E EMISSIO N (EVAP ) TW O WA Y VALV E
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Driveshafts

Disassembly

1. To remove the boot band, pry up the locking tabs

with screwdriver, and raise the end of the band.

NOTE: Carefully clamp the driveshaft in a vise

with soft jaws.

CAUTION: Take care not to damage the boots.

LOCKING TABS

2. Remove both joints.

• Outboard joint side only:

— Remove the circlip from the outboard joint

groove.

— Remove the outboard joint and spring.

CIRCLIP

SPRING

CAP
Outboard joint only.
3. Remove the rollers from the spider.

ROLLER

4. Remove the set ring; then remove the spider with a

bearing remover.

NOTE: Before disassembly, mark the spider and

driveshaft so they can be reinstalled in their original

positions.

SET RING

BEARING REMOVER

Mark

Mark
SPIDER

DRIVESHAFT
SPIDER

SET RINGProCarManuals.com

17. Install new boot bands on the boots, then bend both

sets of locking tabs.

18. Lightly tap on the doubled-over portions to reduce

their height.

NOTE: Install the outboard joint in the knuckle

before installing the driveshaft into the differential

or intermediate shaft. Loosely install the spindle

nut this time.
19. Install the new set rings in the driveshaft groove

and intermediate shaft groove.

20. Apply a light film of grease around the set ring groove

on the inboard joint, then install a new set ring and

center it on the joint. The grease will keep the set

ring centered, making the installation of the joint

easier.

21. Install the inboard end of the driveshaft into dif-

ferential or intermediate shaft.

CAUTION:

• Always use a new set ring whenever the drive-

shaft is being installed.

• Make sure the left driveshaft locks in the dif-

ferential side gear groove, and the CV joint

subaxle bottoms in the differential.

• Insert the right driveshaft CV joint subaxle into

the intermediate shaft until the intermediate

shaft set ring locks in the groove in the right

driveshaft.

Apply light film of

grease before installing.

INBOARD JOINT

SET RING

Replace.
SET RING GROOVE

Left Driveshaft

inboard end
Right Driveshaft

inboard end

(Intermediate shaft side)
LOCKING TABSProCarManuals.com

System Descriptio n
Energy-absorbin g Steerin g Column/Whee l
Both th e steerin g colum n an d steerin g whee l ar e designe d to absor b impac t energ y durin g a collision .
Steerin g Whee l
Th e steerin g whee l absorb s th e energ y o f a collisio n throug h th e deformatio n o f th e spok e portion . Shoul d th e impac t
absorbin g capacit y o f th e colum n sid e decreas e du e to th e deformatio n o f th e vehicl e bod y durin g a collision , th e steerin g
whee l wil l hel p absor b th e impact .
Steerin g Colum n
Th e steerin g colum n is fastene d o n th e bod y throug h a U-shape d plate , an d th e lowe r par t o f th e colum n is inserte d int o a
lowe r holder . Du e t o thi s construction , th e steerin g colum n wil l slid e i n it s axia l directio n whe n a larg e impac t i s give n in
th e axia l directio n o f th e column . Sinc e th e U-shape d plat e i s fastene d t o th e body , th e U-shape d plat e i s ben t an d
deforme d alon g th e guid e whe n th e colum n slide s i n it s axia l direction . Throug h th e deformatio n o f th e plate , th e energ y
i s absorbe d an d th e colum n slide s forward . Whe n expose d t o a greate r impact , a shea r pi n wil l brea k an d th e energ y i s
absorbe d b y th e lowe r shaft .
UNDE R NORMA L CONDITIO N
U-PLATE
U-PLAT EGUIDEAt TIM E O F IMPAC T
The U-plate s absor b a n energ ywhile the y ar e straightene d b ythe uppe r bracket .
UNDER NORMA L CONDITIO N
SHEAR PIN S
At TIM E O F IMPAC T
STEERIN G JOIN T
UNDE R NORMA L CONDITIO N
SPOKE
At TIM E O F IMPAC T
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Steering Gearbo x
Inspectio n
7. Instal l th e boot s o n th e rac k en d wit h th e tub e clamps .
NOTE:
• Coa t th e rac k en d an d insid e o f th e boo t wit h th e
grease .
• Befor e installin g th e boot , b e sur e tha t th e pres -
sur e insid e o f th e boo t i s th e atmospheri c pres -
sure.
• Instal l th e boo t ban d wit h th e rac k i n th e straigh t
ahea d conditio n (righ t an d lef t tie-rod s ar e equa l
i n length) .
BOOT
TUBE CLAM P
STEERIN G GREAS E(Honda P/ N 08733-B070E )Coat th e insid e o f th e boot .
SILICON E GREAS ECoat th e slidin g surfac eof th e rac k end .
8. Instal l th e ne w boo t band s o n th e boot , an d ben d
bot h set s o f lockin g tabs . Lightl y ta p o n th e double d
portion s t o reduc e thei r height .
NOTE : Afte r assembling , slid e th e rac k righ t an d
lef t t o b e certai n tha t th e boot s ar e no t deforme d o r
twisted .
LOCKIN G TAB S
BOOT BAN DReplace .
9. I f th e tie-ro d end s wer e removed , instal l th e tie-rod s
o n th e righ t an d lef t rac k end s an d scre w the m in
unti l th e threade d sectio n is 1 1 m m (0. 4 in ) i n length .
11 m m (0. 4 in)
LOCKNU THand tighten .
TIE-RO D EN D
10. Instal l th e gearbo x an d th e fron t crossbea m in th e
revers e orde r remova l (se e pag e 17-57 ).
11 . Chec k th e whee l alignmen t an d adjus t i f necessar y
(se e sectio n 18 ).
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(Front Compliance Mechanism)

To avoid the usual compromise between ride quality and handling characteristics, a pivot-type "compliance mechanism"

has been designed as an integral part of the front suspension. When one of the front wheels is subjected to a rearward

movement by an uneven road surface or by heavy braking, the load produced has two separate effects. As with any

suspension system, the load acts in the vertical direction to compress the suspension spring and reduce the ride height.

On the NSX/NSX-T the load also acts through both the upper and lower control arms to twist the compliance pivot. This

allows the wheel to move rearward by a controlled amount, thus absorbing energy. The result is an outstanding ride

quality with only minimal changes to track width and wheel geometry. In cornering, the compliance pivot does not come

into play, and the lateral suspension stiffness required for maximum roadholding and optimum control response is main-

tained.

COMPLIANCE

PIVOT

TOP VIEW

(Rear Toe Control Arm)

Many conventional passenger-car independent rear suspension systems are subject to undesirable changes in toe-in

angle with wheel movement. This results in instability both in cornering and in acceleration. In the NSX/NSX-T, the de-

sign and pivot locations of the rear toe control arm produce a slight controlled increase in toe-in during bump travel. As

a result, the NSX/NSX-T is extremely stable under heavy cornering loads and over bumpy road surfaces.

TOP VIEW

TOE CONTROL ARM
COMPLIANCE

PIVOTProCarManuals.com

Illustrated Index

The accumulator contains high-pressure nitrogen gas; do not puncture, expose to flame or attempt to
disassemble the accumulator or it may explode; severe personal injury may result.

HYDRAULIC SYSTEM
Relieving Accumulator/line pressure, page 19-62 ('91-'92) ('93-'96)

MASTER CYLINDER
Index/Torque, page 19-12

Inspection, page 19-13

ABS CONTROL UNIT Replacement, page 19-70

BRAKE BOOSTER

Tests, page 19-14 Pushrod clearance adjustment, page 19-15

UNDER-HOOD

RELAY BOX B

UNDER-HOOD
FUSE/RELAY BOX

REAR WHEEL SENSOR

Inspection, page 19-71

Replacement, page 19-72
POWER UNIT
Torque/Inspection, page 19-66
ACCUMULATOR/PRESSURE SWITCHIndex/Torque, page 19-67 FRONT WHEEL SENSOR
Inspection, page 19-71
Replacement, page 19-72
MODULATOR/SOLENOID UNIT

Index/Torque, page 19-63 ('91-'92) ('93-'96)
Solenoid Leak Test, page 19-64 ('91-'92) ('93-'96)
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