1991 ACURA NSX Service Repair Manual

Ignition Switch

Steering Lock Removal/Installation

6. Disconnect the ignition switch 7-P and 8-P connec-

tors.

7. Remove the column holder mounting bolts and the

mounting nuts, and lower the steering column

assembly.

CAUTION: Be careful not to damage the SRS wire

harness.

16 N-m

(1.6 kg-m, 12 Ib-ft)

39 N-m

(3.9 kg-m, 28 Ib-ft)

8. Center-punch the shear bolt, and drill its head off

with a 5 mm (3/16 in) drill bit.

CAUTION: Do not damage the switch body.

9. Remove the shear bolt from the switch body.
10. Insert the key, and turn it to "I".

11. Push the lock pin, and pull out the steering lock

assembly.

STEERING LOCK

BODY

Installation:

1. Turn the key to "I", push the pin, and insert the

steering lock assembly into the steering column

until it clicks into place.

2. Loosely tighten the new shear bolt. Make sure the

projection on the ignition switch is aligned with the

hole in the steering column.

3. Insert the ignition key, and check for proper opera-

tion of the steering wheel lock and that the ignition

key turns freely.

4. Tighten the shear bolt until the hex head twists off.

SHEAR BOLT

/

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Starting System
Component Location index
A/T GEAR POSITION SWITCH

(Neutral position switch)
Test page 23-160

('93-'96) ('91-'92)
Replacement, page 23-161 .

('93-'96) ('91-'92)

CLUTCH INTERLOCK
SWITCH (M/T)
Test, page 23-80
STARTER
Test page 23-78Solenoid Test, page 23-81
Replacement, page 23-81
Overhaul, page 23-82 Reassembly. page 23-87
STARTER CUT RELAY

Wire colors: BLK/WHT, BLK/BLU.
BLK/WHT and BLK/GRN
Test, page 23-80ProCarManuals.com

Starting System

Description

Starter Interlock System (M/T):

The starter interlock system prevents the engine from starting unless the clutch pedal is fully depressed.

The clutch interlock switch turns on at the position where the clutch disengages: 1 5 — 20 mm (0.59 — 0.79 in) from fully

depressed position.

NOTE: A full stroke of the clutch pedal is 125 mm (4.92 in) from the fully released position.

CLUTCH INTERLOCK SWITCH

Fully Released

Position
CLUTCH PEDALProCarManuals.com

Starting Syste m
Starter Tes t
NOTE : Th e ai r temperatur e mus t b e betwee n 5 9 an d
100° F (1 5 an d 38°C ) befor e testing .
Recommende d Procedure :
• Us e a starte r syste m tester .
• Connec t an d operat e th e equipmen t i n accor -
danc e wit h manufacturer' s instructions .
Alternate Procedure :
• Us e th e followin g equipment :
- Ammeter, 0-400 A
- Voltmeter , 0-2 0 V (accurat e withi n 0. 1
volt )
- Tachometer , 0—120 0 rp m
• Hoo k u p voltmete r an d ammete r as shown .
NEGATIV E CABL E
POSITIV ECABLE
1. Disconnec t th e No . 1 3 (3 0 A ) fus e fro m th e engin e
compartmen t fuse/rela y box .
No. 1 3 (3 0 A )FUS E
2. Chec k th e starte r engagement :
Depres s th e clutc h peda l al l th e wa y (M/T ) o r shif t
to positio n (A/T) , an d tur n th e ignitio n
switch to "Star t (III)" . Th e starte r shoul d cran k th e
engine .
NOTE : O n car s equippe d wit h manua l transmis -
sion , th e engin e wil l no t cran k unles s th e clutc h
peda l i s full y depressed .
• I f th e starte r stil l doe s no t cran k th e engine ,
chec k th e battery , batter y positiv e cable ,
groun d an d th e wir e connection s fo r loosenes s
o r corrosion .
• Tes t again .
I f th e starte r stil l doe s no t cran k th e engine ,
bypas s th e ignitio n switc h circui t a s follows :
Unplu g th e connecto r (BLK/WH T wire ) fro m th e
starter . Connec t a jumpe r wir e fro m th e batter y
positiv e (+ ) termina l t o th e solenoi d terminal .
Th e starte r shoul d cran k th e engine .
SOLENOI D TERMINA L
BLK/WHTWIRE
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- I f th e starte r stil l doe s no t cran k th e engine ,
remov e th e starte r an d diagnos e it s interna l
problems .
- I f th e starte r crank s th e engine , chec k fo r a n
ope n i n th e BLK/WH T wir e an d connector s be -
twee n th e starte r an d ignitio n switch . Chec k th e
ignitio n switch .
On car s wit h automati c transmission , chec k th e
A/ T gea r positio n switc h (neutra l positio n
switch ) an d connector .
O n car s with manua l transmission , chec k th e
starte r cu t relay , clutc h interloc k switc h an d
connectors .
NOTE : Chec k th e No . 2 9 (5 0 A ) fus e an d th e
starte r cu t relay , an d inspec t th e securit y alar m
system .
3 . Chec k fo r wea r o r damage :
Th e starte r shoul d cran k th e engin e smoothl y an d
steadily .
If th e starte r engages , bu t crank s th e engin e er -
ratically , remov e th e starte r motor . Inspec t th e
starter , driv e gea r an d flywhee l rin g gea r fo r
damage .
Check th e driv e gea r overrunnin g clutc h fo r bindin g
or slippin g whe n th e armatur e i s rotated with th e
driv e gea r held . Replac e th e gear s i f damaged .
4 . Chec k crankin g voltag e an d curren t draw :
Voltag e shoul d b e n o les s tha n 8. 5 volts .
Curren t shoul d b e n o mor e tha n 35 0 amperes .
I f voltag e i s to o low , o r curren t dra w to o high ,
chec k for :
• Lo w battery .
• Ope n circui t i n starte r armatur e commutato r
segments .
• Starte r armatur e dragging .
• Shorte d armatur e winding .
• Excessiv e dra g i n engine . 5
. Chec k crankin g rpm :
Engin e spee d durin g crankin g shoul d b e abov e 10 0
rpm .
If spee d i s to o low , chec k for :
Loos e batter y o r starte r terminals .
Excessivel y wor n starte r brushes .
Ope n circui t i n commutato r segments .
Dirt y o r damage d helica l splin e o r driv e gear .
Defectiv e driv e gea r overrunnin g clutch .
6 . Chec k th e starte r disengagement :
Depres s th e clutc h peda l al l th e wa y (M/T ) o r shif t
to positio n (A/T) , tur n th e ignitio n switc h
to "Star t (III) " an d releas e to O N (II) .
The starter drive gea r shoul d disengag e fro m th e
flywhee l rin g gear .
I f th e driv e gea r hang s u p o n th e flywhee l rin g gear ,
check :
• Solenoi d plunge r an d switc h fo r malfunction .
• Driv e gea r assembl y fo r dir t o r damage d over -
runnin g clutch .
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Starting Syste m
Starte r Cu t Rela y Tes t
1. Remov e th e glov e bo x (se e sectio n 20 ).
2 . Disconnec t th e 4- P connecto r fro m th e starte r cu t
relay .
(Wire color s of 4- P connector : BLK/GRN , BLK /
WHT , BLK/BL U an d BLK/WHT )
3 . Chec k continuit y a t th e rela y terminals .
• Ther e shoul d b e continuit y betwee n th e C an d D
terminals .
• Ther e shoul d b e continuit y betwee n th e A an d B
terminal s whe n powe r an d groun d ar e connect -
e d t o th e C an d D terminals .
• Ther e shoul d b e n o continuit y betwee n th e A an d
B terminal s whe n powe r i s disconnected .
Clutch Interloc k Switc h Tes t (M/T )
1. Remov e th e dashboar d lowe r cove r an d kne e bolster ,
the n disconnec t th e 2- P connecto r fro m th e switch .
2 . Chec k fo r continuit y betwee n th e terminal s accord -
in g t o th e table .
CLUTC HINTERLOC KSWITCH
CLUTC H PEDA L
3. I f necessary , replac e th e switc h o r adjus t th e switc h
positio n (se e sectio n 12 ).
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Starter Solenoid Test

1. Check the hold-in coil for continuity between the S

terminal and the armature housing (ground).

The coil is OK if there is continuity.

ARMATURE HOUSING

(GROUND)

PULL - IN COIL HOLD - IN COIL

2. Check the pull-in coil for continuity between the S

and M terminals.

The coil is OK if there is continuity.
Starter Replacement

1. Disconnect the battery negative cable.

2. Remove the engine wire harness from the harness

clip on the starter motor.

3. Disconnect the starter cable and the BLK/WHT

wire.

4. Remove the two bolts holding the starter, and

remove the starter.

UPPER MOUNTING BOLT

75 N-m (7.5 kg-m, 54 Ib-ft)

B-TERMINAL MOUNTING NUT

9 N-m (0.9 kg-m. 6.5 Ib-ft)

STARTER CABLE

LOWER MOUNTING BOLT

75 N-m (7.5 kg-m, 54 Ib-ft)
BLK/WHT WIREProCarManuals.com

Starting Syste m
CAUTION : Disconnec t th e groun d cabl e fro m th e bat -
tery befor e removin g th e starter .SOLENOI D
PLUNGE R
Inspection , pag e 23-8 6
STARTE RSOLENOI DTest, pag e 23-8 1
OVERRUNNIN G
CLUTC H ASSEMBL Y
BRUS H HOLDE R
ARMATUR E IDLE
R GEA R
PINIO N GEA R
EN D COVE R
O-RING
Replace .
FIELD WINDING /
ARMATUR E HOUSIN G
Test, pag e 23-8 6
IDLE R GEA R
SOLENOI D HOUSIN G
HARNES S CLI P BRACKE T STEE
L BAL L
When reassemblin ginstall stee l bal lfrom clutc h side .
MOLYBDENU MDISULFIDE
ROLLER BEARING Sand CAG ESet thes e asid e s o yo u won' t los e them .
MOLYBDENU M DISULFID E
OVERRUNNIN G CLUTC H ASSEMBL Y
Inspection , pag e 23-8 7
GEA R HOUSIN G
MOLYBDENU MDISULFIDE
Starter Overhau l
BRUSH HOLDE R
Test , pag e 23-8 3
BRUSH
Inspection ,page 23-8 3
ARMATURE
Inspection an d Test ,page 23-8 4
O-RIN
G
Replace .
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