1991 ACURA NSX headlights

Idle Contro l Syste m
Idle Spee d Settin g
Inspection/Adjustmen t
NOTE: Befor e settin g th e idl e speed , chec k th e followin g
items :
— Th e Chec k Engin e ligh t ha s no t bee n reporte d on .
— Ignitio n timin g
— Spar k plug s
— Ai r cleane r
— PC V syste m
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 radiato r fa n come s on , the n tur n th e ignitio n
switc h OFF .
2 . Connec t th e SC S servic e connecto r t o servic e chec k
connector .
3. Connec t a OBDI I sca n too l (se e pag e 11-38 ) o r
tachometer .
• Connec t a tachomete r t o loo p o f ignite r uni t sec -
ondary , or.. .
TACHOMETE R
Remove th e rubbe r ca p fro m th e tachomete r
connector an d connec t a tachometer .
TACHOMETE R
RUBBERCAP
TACHOMETE RCONNECTOR
4. Restar t th e engine .
5 . Chec k idlin g i n no-loa d condition s i n whic h th e
headlights , blowe r fan , rea r defogger , coolin g fan ,
an d ai r conditione r ar e no t operating .
NOTE : D o no t depres s th e accelerato r peda l i n thi s
step .
Idl e spee d shoul d be :
Adjus t th e idl e speed , i f necessary , b y turnin g th e
idl e adjustin g screw .
NOTE : Afte r adjustin g th e idl e spee d i n thi s step ,
chec k th e ignitio n timin g (se e sectio n 23 ).
I f i t i s ou t o f spec , g o bac k t o ste p 4 .
IDL E ADJUSTIN GSCREW
ProCarManuals.com

Emission Contro l Syste m
System Descriptio n
The emissio n contro l syste m include s tw o Thre e Wa y
Catalyti c Converter s (TWCs) , Exhaus t Ga s Recirculatio n
(EGR ) system , Positiv e Crankcas e Ventilatio n (PCV ) sys -
te m an d Evaporativ e Emissio n (EVAP ) Contro l system .
Th e emissio n contro l syste m is designe d t o mee t federa l
an d stat e emissio n standards .
Tailpipe Emissio n
Inspectio n
Do no t smok e durin g thi s procedure . Kee p
an y ope n flam e awa y fro m you r wor k area .
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
the radiato r fa n come s on , the n le t i t idle .
2 . Connec t a tachometer .
3 . Chec k an d adjus t th e idl e speed , i f necessar y (se e
pag e 11-128 ).
4 . War m u p an d calibrat e th e C O mete r accordin g t o
th e mete r manufacturer' s instructions .
5 . Chec k idl e C O wit h th e headlights , heate r blower ,
rea r windo w defogger , coolin g fan , an d ai r condi -
tione r off .
NOTE : (Canada ) Pul l th e parkin g brak e leve r up .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
CO mete r shoul d indicat e 0.1 % maximum .
ProCarManuals.com

UNDER-HOOD FUSE/RELAY BOX
UNDER-HOOD RELAY BOX A
DIMMER RELAY
Test, page 23-189
TAILLIGHT RELAYTest, page 23-190
('94-'96) ('91-'93) LEFT HEADLIGHT

RETRACTOR CUT RELAY

Test page 23-190 ('94-'96) ('91-'93)
RIGHT HEADLIGHTRETRACTOR CUT RELAYTest, page 23-190 ('94-'96) ('91-'93)
HEADLIGHT RELAY
Test, page 23-189
RIGHT HEADLIGHT

RETRACTOR RELAY

Test page 23-190
('94-'96) ('91-'93)
RIGHT HEADLIGHT
RETRACTOR MOTOR
Test, page 23-188
Replacement, page

23-186

RIGHT DAYTIME RUNNING
LIGHT (Canada)
Replacement, page, 23-194 HEADLIGHTS

Adjustment, page 23-192

Replacement page 23-163

LEFT DAYTIME RUNNING LIGHT (Canada)
Replacement, page 23-194
LEFT HEADLIGHT
RETRACTOR MOTOR
Test, page 23-186 Replacement, page 23-186 LEFT HEADLIGHT

RETRACTOR RELAY

Test, page 23-190
('94-'96) ('91-'93)ProCarManuals.com

Lighting System

Retractor Motor Replacement

CAUTION:

• Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

• Do not try to replace or clean headlights with the lights

on.

1. Remove the No. 42 (15 A) and No. 43 (15 A) fuses

from the under-hood fuse/relay box.

No. 43
(15A)

FUSE

No. 42
(15A)

FUSE

UNDER-HOOD FUSE/RELAY BOX

2. Turn the knob clockwise to raise the headlight.

CAP

KNOB
3. Remove the two caps, four screws, and cowl clips.

COWL CLIP

CAP

SCREW

4. Slide the headlight housing forward and up.

NOTE: Be careful not to damage the front bumper

or the headlight housing.

HEADLIGHT HOUSING

PROTECTIVE TAPE

5. Disconnect the 6-P connector from the headlight

unit.

6-P CONNECTOR

HEADLIGHT UNIT

6. Remove the four mounting bolts, then remove the

unit.
MOUNTING

BOLTSProCarManuals.com

Headlights

Description

The light first forms basic pattern A after being interrupt-

ed by the interrupter plate and passed through the con-

vex lens. The interrupter plate determines the form.

The outer lens distributes the light into pattern B.

Screen
CONVEX LENS

INTERRUPTER PLATE

BULB

REFLECTOR

OUTER LENSProCarManuals.com

Headlights

Adjustment

Adjust the headlights to local requirements by turning the adjusters as shown.

NOTE: Be careful not to damage the front fender or the

headlight housing when adjusting.

HEADLIGHT HORIZONTAL

AIM ADJUSTER

HEADLIGHT VERTICAL

AIM ADJUSTER
PROTECTIVE TAPEProCarManuals.com

Headlight Replacement

CAUTION:

• Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

• Do not try to replace or clean the headlights with the

lights on.

1. Remove the No. 42 (15 A) and No. 43 (15 A) fuses

from the under-hood fuse/relay box.

No. 43
(15A)

FUSE

No. 42
(15A)

FUSE

UNDER-HOOD FUSE/RELAY BOX

2. Remove the cap, and turn the knob clockwise to

raise the headlight.

CAP

RETRACTOR

KNOB
3. Remove the two caps, four screws, and cowl clips.

COWL CLIP

CAPS

SCREW

4. Slide the headlight housing forward and up to re-

move it. Be careful not to damage the bumper or the

housing.

HEADLIGHT HOUSING

PROTECTIVE TAPE

5. Disconnect the 6-P connector from the headlight

unit.

6-P CONNECTOR

MOUNTING

BOLTS

HEADLIGHT UNIT

6. Remove the four mounting bolts, then remove the

headlight unit.

7. After installing the new headlight, adjust both head-

lights to local requirements.ProCarManuals.com

Headlights

Bulb Replacement

CAUTION:

• Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

• Do not try to replace or clean the headlights with the

lights on.

1. Remove the bulb cap.

BULB

(HI:
60
W/LO:
51 W)

BULB CAP

2-P CONNECTOR

2. Disconnect the 2-P connector, then remove the re-

taining spring and bulb.
Daytime Running Lights

(Canada)

Replacement

1. Remove the bolt, and pull out the daytime running

light, then disconnect the 2-P connector.

2-P

CONNECTOR

BOLT
DAYTIME RUNNING LIGHT

2. If necessary, replace the bulb.

DAYTIME RUNNING

LIGHT

BULB (32CP)

SOCKET
RETAINING SPRING
Do not touch

the glass.ProCarManuals.com