ACURA NSX 1991 Service Repair Manual

Diagnostic Troubl e Cod e (DTC ) Indicatio n
1. Connec t th e SC S servic e connecto r t o th e servic e chec k connecto r unde r th e glov e box .
SCS SERVIC E CONNECTO R07PAZ - 001010 0
SERVIC E CHEC KCONNECTO R (2P )
2. Tur n th e ignitio n switc h O N (II) , bu t d o no t star t th e engine .
3. Recor d th e blinkin g frequenc y o f th e EP S indicato r light . Th e blinkin g frequenc y indicate s th e diagnosti c troubl e cod e
(DTC) .
NOTE: Chec k th e DT C carefull y an d recor d it . Th e memor y o f th e DT C is erase d i f th e connecto r i s disconnecte d fro m
the EP S contro l unit .
GAUG E ASSEMBL YEPS INDICATO R LIGH T
17-23
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Diagnostic Trouble Code (DTC) Indication

Example:

1.3 seconds
DTC Indication Pattern:

DTC:
11
DTC:
12

EPS Indicator light ON

EPS Indicator light OFF
0.28 seconds

Repeat

Connect the SCS Turn the ignition

service connector switch ON (II)

0.36 seconds 1.3 seconds

• The DTC is indicated by a series of long and short blinks. One long blink equals 10 short blinks.

Add the long and short blinks together to determine the DTC.

• The DTCs are repeated sequentially beginning with the lowest number.

4. Remove the SCS service connector.

NOTE: The Malfunction Indicator Lamp (MIL) will stay on after the engine is started if the SCS service connector is

connected.

5. Remove the CLOCK (7.5 A) fuse in the under-hood fuse/relay box for more than 10 seconds to erase the EPS control

unit memory.ProCarManuals.com

Symptom-to-System Char t
Diagnosti c Troubl e Cod e (DTC )
17-27
17-29
17-31
17-3 6
17-38
17-4 0
Initia l diagnosis : Performe d righ t afte r th e engin e start s unti l th e EP S indicato r ligh t goe s off .
Regula r diagnosis : Continuousl y performe d (unde r som e conditions ) afte r th e EP S indicator light goe s of f unti l th e
engin e stops .
Individua l part/syste m diagnosis : Diagnose s a specifi c part/syste m unde r it s operatin g conditions .
ROM : Read-Onl y Memor y
AD C : Analo g Digita l Combate r
PI C : Programb e Interrup t Controle r
RAM : Rando m Acces s Memor y
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Troubleshooting
Hard Steerin g
Steering is heavy .
Star t th e engin e an d chec k th e EP S
indicato r light .
Does th e EP S indicato r ligh t
com e on ? Refe
r t o th e symptom-to-syste m
Char t (se e pag e 17-25 ).
Ar e the y normal ? Correc
t th e ai r pressur e o r whee l
alignment .
Chec k th e powe r assis t wit h th e
ca r parked :
1 . Par k th e vehicl e o n a leve l sur -
fac e wit h th e wheel s pointin g
straigh t ahead .
2 . Measur e th e steerin g whee l
turnin g force . Refe r t o th e char t
on th e right .
Powe r Assis t Chec k wit h Ca r Parked :
Connect a sprin g scal e t o th e steerin g whee l an d tur n th e
wheel . Rea d th e measuremen t whe n th e fron t wheel s star t
to move .
Is i t withi n specification ? Chec
k fo r loos e th e EP S contro l
uni t connector s o r poo r contac t
o f terminals , an d inspec t th e
mechanica l steerin g system :
EP S syste m is OK .
Chec
k th e tir e pressur e an d fron t
whee l alignment .
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Inspection
Steering Whee l Rotationa l Pla y
1. Plac e th e fron t wheel s i n a straigh t ahea d position ,
an d measur e th e distanc e th e steerin g whee l ca n b e
turne d withou t movin g th e fron t wheels .
2. I f th e pla y exceed s th e servic e limit , chec k al l steer -
in g components .
Servic e Limit : 5 m m (0. 2 in ) maximu m
Power Assis t Chec k Wit h Ca r
Parke d
Turn th e steerin g whee l wit h a sprin g scale . Rea d th e
measuremen t whe n th e fron t wheel s o r steerin g whee l
star t t o move .
Operatio n Standar d
Steering Gearbo x Adjustmen t
Serious burn s ma y resul t i f yo u touc h an y
coolin g component s whe n th e coolin g syste m is hot .
1 . Loose n th e rac k guid e scre w locknut .
2 . Tighten , loose n an d retighte n th e rac k guid e scre w
tw o time s t o 4 N- m (0. 4 kg-m , 2. 9 Ib-ft) , the n bac k i t
of f 20 ° 1 °
LOCKNU T
RACK GUID E SCRE W
3. Tighte n th e locknu t o n th e rac k guid e scre w wit h
th e specia l tool .
4 . Chec k fo r tigh t o r loos e steerin g throug h th e com -
plet e turnin g travel .
5 . Rechec k steerin g assist .
LOCKNU T25 N- m (2. 5 kg-m , 1 8 Ib-ft )
RACK GUID E SCRE W
LOCKNU T WRENCH , 4 0 m m0791 6 - SA5000 1
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Steering Whee l
Remova l
Airbag Remova l
Stor e a remove d airba g assembl y wit h th e
pa d surfac e up . I f th e airba g i s improperl y store d fac e
down , accidenta l deploymen t coul d prope l th e uni t wit h
enoug h forc e to caus e seriou s injury .
NOTE : Befor e removin g th e steerin g wheel , mak e sur e
th e fron t wheel s ar e straigh t ahead .
SR S 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 ser -
vice .
1 . Disconnec t bot h th e negativ e cabl e an d positiv e
cabl e fro m th e battery .
2 . Remov e th e acces s pane l fro m th e steerin g whee l
lowe r cover , the n remov e th e shor t connector .
3 . Disconnec t th e connecto r betwee n th e airba g an d
cabl e reel .
4 . Connec t th e shor t connecto r t o th e airba g sid e o f
th e connector .
AIRBAG 3P
CONNECTO R
ACCES S PANE L
CABL E REE L 3 P
CONNECTO RSHOR
T CONNECTO R
(RED)
5. Remov e th e Tor x bolt s usin g a Tor x T3 0 bit , the n
remov e th e airba g assembly .
TORX BOLT SReplace .
CRUISE CONTRO L SET/RESUM ESWITCH
TORX BOL TReplace .
AIRBAG ASSEMBL Y
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Steering Wheel

Removal

7. Disconnect the connectors from the horn and cruise

control set/resume switches, then remove the cable

reel connector from its clips.

CRUISE CONTROL

SET/RESUME SWITCHES

4P CONNECTOR

HORN

CONNECTOR

CABLE

REEL

CONNECTOR
8. Remove the steering wheel nut.

9. Remove the steering wheel by rocking it slightly

from side-to-side as you pull steadily with both

hands.

STEERING WHEEL

NUT

Replace.ProCarManuals.com

Steering Whee l
Disassembly/Reassembl y
Store a remove d airba g assembl y wit h th e
pa d surfac e up . I f th e airba g i s improperl y store d fac e
down , accidenta l deploymen t coul d prope l th e uni t wit h
enoug h forc e to caus e seriou s injury .
NOTE : I f a n intac t airba g assembl y ha s bee n remove d
fro m a scrappe d ca r o r ha s bee n foun d defectiv e o r dam -
age d durin g transit , storag e o r service , i t shoul d b e
deploye d (se e sectio n 24 ). CAUTION
:
• Carefull y inspec t th e airba g assembl y befor e install -
ing . D o no t instal l a n airba g assembl y tha t show s
sign s o f bein g droppe d o r improperl y handled , suc h
a s dents , crack s o r deformation .
• Alway s kee p th e shor t connecto r o n th e airba g con -
necto r whe n th e harnes s is disconnected .
• D o no t disassembl e o r tampe r wit h th e airba g assem -
bly.
STEERIN G WHEE L
STEERIN G WHEE L
LOWE R COVE R
ACCESS PANE L
AIRBA G ASSEMBL Y
CRUISE CONTRO L SET /RESUM E SWITC H
STEERIN G
WHEE L
NUT TORX BOLTReplace . 10 N .m(1. 0 kg-m , 7 Ib-ft )
Replace .
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Installation

NOTE: Before installing the steering wheel, make sure

the front wheels are straight ahead.

CAUTION:

• Be sure to install the harness wires so that they are

not pinched or interfering with other car parts.

• Do not replace the original steering wheel with any

other design, since it will make it impossible to prop-

erly install the airbag. (Use only genuine Honda

replacement parts.)

• After reassembly, confirm that the wheels are still

straight ahead and that steering wheel spoke angle

is correct. If minor spoke angle adjustment is neces-

sary, adjust the tie-rods only. Do not remove and

reposition the steering wheel.

Confirm that the airbag assembly is securely

attached to the steering wheel; otherwise, severe per-

sonal injury could result during later airbag deploy-

ment.

1. Before installing the steering wheel, center the

cable reel.

Do this by first rotating the cable reel clockwise

until it stops.

Then rotate it counterclockwise (approximately two

turns) until:

— The yellow gear tooth lines up with the mark on

the cover.

— The arrow on the cable reel label points straight

up.

ARROW MARK

CABLE REEL

YELLOW GEAR TOOTH

ALIGNMENT MARK
2. Install the steering wheel.

NOTE: Be sure the steering wheel shaft engages

the cable reel.

STEERING WHEEL

NUT

Replace.

50 N-m

(5.0 kg-m, 36 Ib-ft)

PIN

3. Insert the cruise control set/resume 4P connector

and airbag 3P connector to the steering wheel clips.

4. Connect the horn connector.

CRUISE CONTROL

SET/RESUME SWITCHES

4P CONNECTOR

HORN

CONNECTOR

CABLE REEL

CONNECTOR
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Steering Wheel

Installation

5. Install the airbag assembly with new Torx bolts.

TORX BOLT

10 N-m (1.0 kg-m, 7 Ib-ft)

Replace.

TORX BOLTS

10 N-m (1.0 kg-m, 7 Ib-ft)

Replace.
AIRBAG ASSEMBLY

6. Disconnect the short connector from the airbag 3P

connector.

7. Connect the airbag 3P connector and cable reel 3P

connector.

8. Attach the short connector to the access panel, then

install the access panel on the steering wheel lower

cover.

ACCESS PANEL

SHORT CONNECTOR

(RED)
9. Connect the battery positive terminal, and then con-

nect the negative terminal.

10. After installing the airbag assembly, confirm proper

system operation:

• Turn the ignition to II: the instrument panel SRS

indicator light should come on for about six sec-

onds and then go off.

• Confirm operation of horn buttons.

• Confirm operation of cruise control set/resume

switch.

• Turn the steering wheel counterclockwise and

make sure the yellow gear tooth still lines up

with the alignment mark.

YELLOW GEAR TOOTH

ALIGNMENT MARKProCarManuals.com