1991 ACURA NSX relay

Relay and Control Unit Locations

Dashboard

TURN SIGNAL/HAZARD

RELAY
CLIMATE CONTROL UNIT

UNDER-DASH FUSE BOX
FOOT WELL LIGHT

DASHBOARD

LOWER COVER

INTEGRATED

CONTROL UNIT
SRS UNITProCarManuals.com

Dashboard, Door and Floor

DRIVER'S DOOR PANEL

ABS CONTROL UNIT

DAYTIME RUNNING

LIGHTS CONTROL

UNIT (Canada)

POWER WINDOW

CONTROL UNIT

STARTER CUT RELAY

Wire colors: BLK/WHT,

BLK/WHT, BLK/GRN,

and BLK/BLU

SECURITY CONTROL UNIT

CIGARETTE LIGHTER

RELAY

Wire colors: YEL/RED,

BLU/GRN, BRN/YEL, and BLK
FOOT WELL BASS SPEAKER
EPS CONTROL UNIT

(Behind foot well

bass speaker)

RIGHT FRONT FLOOR

PANEL

SRS UNIT
POWER DOOR LOCK

CONTROL UNITProCarManuals.com

Relay and Control Unit Locations

Rear Bulkhead

PGM-FI MAIN RELAY
THROTTLE VALVE CONTROL

MOTOR RELAY

Wire colors: BLK,

YEL/BLK, GRN/RED,

and WHT/BLU
TCS CONTROL UNIT
TRANSMISSION CONTROL

MODULE (TCM) (A/T)

PULSE UNIT (M/T)

DASH LIGHTS

BRIGHTNESS

CONTROL UNIT
FAN CONTROL

UNIT

ECMProCarManuals.com

Relay and Control Unit Locations

Engine Compartment

REAR WINDOW DEFOGGER

RELAY
ENGINE COMPARTMENT

FAN RELAY (A/T)

Wire colors: YEL/BLK,

BLU/RED, WHT/GRN,

and WHT/BLU

SPARK PLUG VOLTAGE

DETECTION MODULE
ENGINE COMPARTMENT

FUSE/RELAY BOX

IGNITION CONTROL

MODULE (ICM)ProCarManuals.com

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

- 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 .
ProCarManuals.com

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 ).
ProCarManuals.com

Ignition Syste m
Idle Spee d Inspectio n
1. Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (A/ T in position , M/ T in neutral ) unti l
th e radiator fan come s on , the n le t i t idle .
2 . Connec t a tachomete r t o th e tes t tachomete r
connector .
TEST
TACHOMETE R
CONNECTO R
JUMP STAR TTERMINA Lin th e engin ecompartmen tfuse/relay bo x
Idle Spee d (rpm) :
TEST
TACHOMETE R
CONNECTO R
NOTE: Al l electrica l system s ar e turne d OFF .
3 . Adjus t th e idl e spee d i f necessar y (se e sectio n 11 ).
Ignitio n Contro l Modul e (ICM )
Replacemen t
1. Disconnec t th e 8- P an d 6- P connector s fro m th e ig -
nitio n contro l modul e (ICM) .
2. Remov e th e tw o mountin g bolts , an d slid e th e IC M
ou t towar d th e fron t side .
CAUTION : B e carefu l no t t o damag e th e vacuu m
hose s whe n removin g th e ICM .
MOUNTIN G BOLT S12 N- m11.2 kg-m , 8. 7 Ib-ft )
6-P CONNECTO R
8- P CONNECTO R
G103
SERVIC E LOO P
TACHOMETE
R
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