ACURA NSX 1991 Service Repair Manual

TCS Contro l Uni t Termina l Arrangemen t
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Troubleshooting
TCS Indicato r Ligh t
Temporar y Drivin g Conditions :
1 . Th e TC S indicato r ligh t wil l com e o n an d th e contro l uni t memorize s th e Diagnosti c Troubl e Cod e (DTC ) unde r certai n
temporar y conditions :
• Th e spar e tir e is installed , o r a tir e o f th e imprope r siz e is installed .
• Th e tir e pressure s ar e no t correct .
2 . I f th e TC S indicato r ligh t doe s no t com e bac k o n afte r correctin g th e tir e o r tir e pressur e problem , th e TC S syste m is
OK .
3. Remov e th e CLOC K (7. 5 A ) fus e fo r a t leas t thre e second s to clea r th e DT C fro m th e TC S contro l uni t memory .
NOTE : Disconnectin g th e CLOC K fus e als o cancel s th e radi o prese t station s an d th e cloc k setting . Mak e not e o f th e
radi o preset s befor e removin g th e fus e s o yo u ca n rese t them .
TC S Diagnosti c Troubl e Cod e (DTC ) Indication :
1 . Sto p th e engine .
2 . Tur n th e ignitio n switc h O N (II) , an d confir m tha t th e TC S indicato r ligh t come s on .
3 . Tur n th e ignitio n switc h off .
4 . Connec t th e SC S servic e connecto r t o th e servic e chec k connecto r locate d unde r th e glov e box .
5 . Tur n th e ignitio n switc h O N (II) , bu t d o no t star t th e engine .
6 . Recor d th e blinkin g frequenc y o f th e TC S indicato r light . Th e blinkin g frequenc y indicate s th e DTC . Lon g blink s indi -
cat e th e mai n code : shor t blink s indicat e th e sub-code .
7 . Refe r t o th e Troubleshootin g Guid e (pag e 19-88 ) fo r repai r information .
SERVICE CHEC KCONNECTO R (2P )
TCS INDICATO R LIGH T
SCS SERVIC E CONNECTO R07PAZ-001010 0
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NOTE:
• Th e TC S contro l uni t ha s thre e memor y registers . Whe n a proble m occurs , th e contro l uni t store s th e Diagnosti c
Troubl e Cod e (DTC ) i n th e firs t memor y register . I f anothe r proble m occurs , o r th e sam e proble m occur s again , th e con -
tro l uni t move s th e firs t cod e t o th e nex t memor y registe r an d store s th e secon d cod e i n th e firs t register . I f there' s a
thir d proble m occurrence , th e tw o existin g cod e ar e move d u p on e registe r an d th e thir d cod e is store d in th e firs t reg -
ister . I f problem s continu e t o occur , th e oldes t cod e is move d ou t o f th e las t registe r an d lost , an d th e mos t recen t cod e
i s store d in th e firs t register .
• Th e TC S indicato r ligh t wil l no t com e o n agai n afte r th e engin e start s unles s anothe r proble m occurrenc e is detected .
However , ther e wil l stil l b e a cod e store d in th e contro l unit' s memory .
• Afte r th e repai r i s completed , disconnec t th e SC S servic e connecto r fro m th e Servic e Chec k connector , an d remov e th e
CLOC K (7. 5 A ) fus e fro m th e under-hoo d fuse/rela y bo x fo r a t leas t thre e second s to eras e th e contro l unit' s memory .
• Th e contro l unit' s memor y i s erase d i f th e connecto r i s disconnecte d fro m th e contro l uni t o r i f th e contro l uni t i s
remove d fro m th e car .
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Troubleshooting
Troubleshooting Guide

Refer
to

page
19-87('91-'93)(''94-'96)
19-89('91-'93)(''94-'96)
19-90('91-'93)(''94-'96)
19-91('91-'93)(''94-'96)
19-94('91-'93)(''94-'96)
19-97('91-'93)(''94-'96)
19-100 ('91-'93)(''94-'96)
19-102 ('91-'93)(''94-'96)
19-103 ('91-'93)(''94-'96)
19-105 ('91-'93)(''94-'96)
19-106 ('91-'93)(''94-'96)
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Electronic Component s
TCS Switc h Inspectio n
Between termina l No . 4 an d No . 5
(Illuminatio n ligh t circuit )
Ther e shoul d b e continuity .
Betwee n termina l No . 1 an d No . 2
(Switc h circuit )
Ther e shoul d b e continuit y whe n th e switc h i s pushed ,
an d ther e shoul d b e n o continuit y whe n th e switc h i s
released .
TCS SWITC H
TC S SWITC H
Lateral Acceleratio n (Lg ) Senso r
Inspectio n
CAUTION : B e carefu l no t t o dro p o r bum p th e L g sensor ,
an d don' t remov e o r instal l i t wit h a n impac t wrench ;
th e L g senso r ma y b e damaged .
1 . Remov e th e rea r cente r tri m pane l (se e sectio n 20 ).
2 . Remov e th e L g senso r fro m th e bracket .
BRACKE T
Lg SENSO R
3. Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n termina l No . 1 an d
No . 2 wit h th e connecto r connected .
• Ther e shoul d b e approx . 2. 5 V whe n th e L g senso r
i s vertical .
• Ther e shoul d b e approx . 1. 5 V whe n th e L g senso r
i s horizonta l wit h th e connecto r sid e facin g up .
• Ther e shoul d b e approx . 3. 5 V whe n th e L g senso r
i s horizonta l wit h th e connecto r sid e facin g down .
Lg SENSO R CONNECTO R
WIR E SID E O F FEMAL E TERMINAL S
VERTICA L
Lg SENSO R
CONNECTO R
CONNECTO R SID E FACIN G U P
CONNECTO R
CONNECTO R SID E FACIN G DOW N
CONNECTO R
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Electronic Component s
Steering Angl e Senso r Replacemen t
Removal
1 . Remov e th e steerin g colum n covers . Installatio
n
1 . Instal l th e steerin g angl e senso r b y tightenin g tw o
bolts , an d mak e sur e th e adjustin g shim s ar e installe d
properly .
CAUTION : D o no t appl y an y greas e o r oi l t o th e
adjustin g shim .
Detec tPart.
ADJUSTIN GSHIMS
2. Disconnec t th e 5 P connecto r fro m th e steerin g angl e
sensor .
3 . Remov e th e steerin g angl e senso r mountin g bolt s
an d washers , the n remov e th e steerin g angl e sensor .
NOTE : D o no t los e th e adjustin g shim s use d
betwee n th e steerin g angl e senso r an d senso r
mounting bracket .
CAUTION : D o no t damag e o r dro p th e steerin g angl e
senso r a s it i s sensitive .
STEERINGANGLESENSO R
WASHER S BOLT
S BOLT
S
1 0 N- m (1. 0 kg-m , 7. 2 Ib-ft ) STEERIN
G
ANGLESENSO R
2. Connec t th e 5 P connecto r t o th e steerin g angl e sensor .
3 . Instal l th e steerin g colum n covers .
4 . Perfor m th e steerin g angl e senso r syste m chec k
(se e nex t page) .
NOTE :
• Ther e is n o nee d to selec t (replace ) th e shim s whe n
th e steerin g angl e senso r i s replaced . Us e th e origi -
na l shims .
• Selectio n (Replacement ) o f th e adjustin g shim s
(fo r adjustin g th e ai r gap ) i s require d onl y whe n
th e steerin g colum n assembly (without th e sen -
sor ) i s replaced .
WASHER S
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Steering angle sensor system check

1. Start the engine,
2. Push the TCS switch three times within three seconds.
NOTE: Always maintain the same number of rota-
tions.
3. Turn the steering wheel slowly from left to right more than 1.5 turns.

NOTE:
Start checking after the steering wheel moves at
least 1.5 turns from right to left.
Turn the steering wheel slowly, no faster than
one turn in four seconds.
4. Push the TCS switch twice within three seconds. NOTE: Always maintain the same number of rota-
tions.
5. Return the steering wheel to the left side slowly, and check the number of times the TCS indicator light
flashes after the wheel has moved approximately
one turn.

NOTE:

Start the check from the beginning when the steer-ing wheel moves at least one turn from left to
right, Turn the steering wheel slowly, no faster than one
turn in four seconds.
Standard number of times the TCS indicator light

flashes:
Manual Transmission: 5 times
Automatic Transmission: 2 times
6. If there is an abnormality, check the troubleshooting flowchart (see page 19-98('91-'93)('94-'96)
Selection of the adjusting shims for the steering angle

sensor air gap adjustment

NOTE:

The adjustment of the air gap between the steeringshaft and the steering angle sensor should be carried
out in order to obtain adequate sensor output.
The adjusting shim reference number is stamped on
the steering column. Select the adjusting shims that match the reference number using the table below.
Reference Number Locations

REFERENCE

NUMBER

STEERING

COLUMN
Selection of The Adjusting Shim
Adjusting Shim Parts Number

A:53395–SL0–A01
B: 53396–SL0–A01

C: 53397–SL0–A01
D: 53398–SL0–A01
Thickness

0.1 mm

0.2 mm

0.4 mm

0.7 mm
Color

Yellow
Black

Green

White

Reference Number

1

2

3

4

5

6

7

8
Shim (P/N): (Thickness)
Not used: (0 mm)

A:
(0,1
mm)
B:
(0.2
mm)

A + B:
(0.3
mm)
C:
(0.4
mm)

A + C:
(0.5
mm)

B + C:
(0.6
mm)
D:
(0.7
mm)ProCarManuals.com

Electronic Component s
TCS Contro l Uni t Replacemen t
1. Remov e th e lef t rea r tri m pane l an d rea r uppe r tri m
pane l (se e sectio n 20 ).
2 . Remov e th e wir e harnes s bracket .
3 . Disconnec t th e TC S contro l uni t connectors .
4 . Remov e th e TC S contro l unit .
TCS CONTRO L UNI T
CONNECTOR S
WIRE HARNES S BRACKE T
5. Instal l th e TC S contro l uni t i n th e revers e orde r o f
removal .
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Special Tools

Ref.
No.

Tool Number

07MAZ-SP00200
Description

SRS Service Connector
Qty

2
Page Reference
20-55('91-'93)('94-'96),

56('91-'93)('94-'96),
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