1997 ACURA NSX lights

Pulsed Secondary Air Injection System Description

The air pump system is designed to advance the activation of the catalyst and to reduce the hydrocarbons (HC), carbon

monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas.

The system operates after the engine starts under the following conditions:

• The engine coolant temperature is between 0°C and 70°C (32°F and 158°F).

• The difference in engine coolant temperature is more than 20°C (36°F) between the time when the engine is started and

when the engine is stopped in the previous driving cycle.

AIR CONTROL

SOLENOID VALVE

AIR CONTROL

VALVE

WHT

AIR PUMP

RELAY
From

No. 5 BACK-UP LIGHTS

ALTERNATOR

TURN SIGNALS

(15 A) FUSE

From

AIR PUMP

(60 A) FUSE

AIR CONTROL VALVE

VACUUM TANK

AIR CONTROL VALVE

CHECK VALVE

When the engine is started, the air pump runs and sends fresh air to the air control valve. The air control valve allows the

fresh air to flow to the exhaust ports when its diaphragm is pulled by engine vacuum. It gets engine vacuum from the air

control solenoid, which is activated by the ECM. Once the fresh air flows into the exhaust ports near the exhaust valves, it

reacts with the exhaust gases, raising exhaust gas temperatures. This promotes faster warm-up of the catalytic converter.

The system operates for a maximum of 60 seconds, but the running time shortens in relation to the engine coolant tem-

perature and the intake air temperature. When the system is not operating, the air control solenoid and the air control

valve are closed to prevent exhaust gases from entering the system.
AIR PUMP

ELECTRICAL

CURRENT

SENSORProCarManuals.com

Component Location s
SERVICE CHEC KCONNECTO R (2P ) RIGHT-REA
R WHEE L SENSO R
UNDER-HOO D
FUSE/RELA Y BO X
RIGHT-FRON TWHEEL SENSO R
LEFT-REA RWHEEL SENSO R
UNDER-DAS H FUS E BO X
AB S MODULATO R
CONTROL UNI T
GAUG E ASSEMBL Y
AB S INDICATO R
LEFT-FRON TWHEEL SENSO R
UNDER-HOO D FUSE/RELA Y BO X
ABS(30 A ) FUS E
IG S W (A )(50 A ) FUS E BRAK
E LIGHTS/HOR N
(2 0 A ) FUS E
UNDER-DAS H FUS E BO X
ABS 1 , 4(2 0 A ) FUS E
BACK-U P LIGHT S
(ISA ) FUS E
HEATE R CONTRO L
(15 A) FUSE
ProCarManuals.com

Headlights
Adjustmen t
Before adjustin g th e headlights :
• Par k th e vehicl e o n a leve l surface .
• Mak e sur e th e tir e pressure s ar e correct .
• Th e drive r o r someon e wh o weight s th e sam e shoul d
si t i n th e driver' s seat .
1 . Clea n th e oute r len s s o tha t yo u ca n se e th e cente r
o f th e headlights . 4
. Tur n th e lo w beam s on .
5 . Determin e i f th e headlight s ar e aime d properly .
Vertica l adjustment :
Measur e th e heigh t o f th e headlight s (A) . Th e light s
shoul d reflec t 5 2 m m (2. 1 in. ) belo w th e head-ligh t
height. (B)
6. I f necessary , adjus t th e headlight s t o loca l require -
ment s b y turnin g th e horizonta l adjuste r an d th e
vertica l adjuster .
2 . Par k th e vehicl e wit h th e headlight s 7. 5 m (2 5 ft )
awa y fro m a wal l o r a screen .
3 . Ope n th e hood .
ProCarManuals.com

3-15
T
ITEMMETRICENGLISH
ELECTRICALBattery
Starter
Alternator
Fuses
In the under-dash fuse box
In the under-hood fuse/relay box
In the engine compartment
fuse/relay box
Headlights, high, low
Front turn signal lights
Front parking lights
Rear turn signal lights
Brake/Taillights
Taillights
Front side marker lights
Rear side marker lights
Back-up lights
License plate lights
Gauge lights
Indicator lights
Glove box and fuse lights
Ceiling lights
Trunk lights
Door courtesy lights
Footwell light
Illumination and indicator lights
High mount brake light12 V – 52AH/5HR
12 V – 55AH/5HR
12 V – 1.4 kW
12 V – 120 A
7.5 A, 10 A, 15 A
7.5 A, 10 A, 15 A, 20 A, 30 A, 40 A, 50 A
10 A, 20 A, 30 A, 40 A, 120 A
12 V – 65 W/35 W (HID)
12 V – 45 CP
12 V – 5 W
12 V – 45 CP
12 V – 32/2 CP
12 V – 2 CP
12 V – 3 CP
12 V – 3 CP
12 V – 32 CP
12 V – 8 W
12 V – 3.0 W, 1.4 W
12 V – 1.4 W, 1.96 W
12 V – 3.4 W
12 V – 8 W
12 V – 3.4 W
12 V – 3.4 W
12 V – 5 W
12 V – 1.4 W, 0.84 W
12 V – 0.91 W, LED
LED
TIRE
M/T
A/T
BRAKE SYSTEM
Front: 215/40 R17 83Y Rear: 255/40 R17 94Y165/80 D 16 (Folding spare tire)
Power assisted self-adjusting
ventilated disc
58.0/38.8 cm
28.99/6.01 sq in
Mechanical expanding, rear two wheel
brakes
WHEEL
ALIGNMENTCamber Front
Rear
Caster
Toe Front
Rear–0 °20 ’
–1 °30 ’
8 °
Out 3.5 mm Out 0.14 in
In 4.0 mm In 3/16 in
NOTES
Size
Type, front and rear
Pad and lining surface area: front/rear
Parking brake type
*04-NSX (61SW004)SEC03(01-16) 9/22/04 1:49 PM Page 3-15
ProCarManuals.com

PGM-FI System

System Description (cont'd)

3. Fuel Cut-off Control

During deceleration with the throttle valve closed, current to the fuel injectors is cut off to improve fuel economy at

speeds over 1,500 rpm.

Fuel cut-off action also takes place when engine speed exceeds 8,300 rpm, regardless of the position of the throttle

valve, to protect the engine from over-revving.

4. A/C Compressor Clutch Relay

When the ECM receives a demand for cooling from the air conditioning system, it delays the compressor from being

energized, and enriches the mixture to assure smooth translation to the A/C mode.

5. Evaporative Emission (EVAP) Purge Control Solenoid Valve

When the engine coolant temperature is below 153°F (67°C), the ECM controls the EVAP purge control solenoid valve

which cuts vacuum to the EVAP purge control canister diaphragm.

6. Intake Air Bypass (IAB) Control Solenoid Valve

When the engine speed is below 4,800 rpm, the IAB control solenoid valve is activated by a signal from the ECM. Intake

air then flows through the smaller chamber, and high torque is delivered. To increase air flow at engine speeds higher

than 4,800 rpm, the solenoid valve is deactivated by the ECM, and the intake air flows through the larger chamber.

7. Exhaust Gas Recirculation (EGR) Control Solenoid Valve

When the EGR is required for control of oxides of nitrogen (NOx) emissions, the ECM supplies ground to the EGR

control solenoid valve which supplies regulated vacuum to the EGR valve.

ECM Fail-safe/Back-up Functions

1. Fail-Safe Function

When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-programmed

valve for that sensor that allows the engine to continue to run.

2. Back-up Function

When an abnormality occurs in the ECM itself, the fuel injectors are controlled by a back-up circuit independent of the

system in order to permit minimal driving.

3. Self-diagnosis Function [Malfunction Indicator Lamp (MIL)]

When an abnormality occurs in a signal from a sensor, the ECM lights the MIL and stores the diagnostic trouble code

in erasable memory. When the ignition is initially turned on, the ECM supplies ground for the MIL for two seconds to

check the MIL bulb condition.

4. Two Trip Detection Method

To prevent false indications, the Two Trip Detection Method is used for the H02S, fuel metering-related, idle control

system, ECT sensor, EGR system self-diagnostic functions and EVAP control system. When an abnormality occurs,

the ECM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and ON (II)

again, the ECM informs the driver by lighting the MIL.

However, to ease troubleshooting, this function is cancelled when you short the service check connector. The MIL will

then blink immediately when an abnormality occurs.

5. Two (or three) Driving Cycle Detection Method

A "Driving Cycle" consists of starting the engine, beginning closed loop operation, and stopping the engine. If misfir-

ing that increases emissions or EVAP control system malfunction is detected during two consecutive driving cycles,

or TWC deterioration is detected during three consecutive driving cycles, the ECM turns the MIL on.

However,
to
ease
troubleshooting,
this
function
is
cancelled when
you
short
the
service check connector.
The MIL
will

then blink immediately when an abnormality occurs.ProCarManuals.com

Engine Contro l Modul e (ECM )
NOTE: I f thi s sympto m is intermittent , chec k fo r a loos e No . 5 BACK-U P LIGHTS , ALTERNATOR ,
TUR N SIGNAL S (1 5 A ) fus e in th e under-das h fuse/rela y box , a poo r connectio n a t EC M termina l
A7 , o r a n intermitten t ope n in th e BL U wir e betwee n th e EC M (A7 ) an d th e gaug e assembly .
I s th e lo w oi l pressur e ligh t on ?
Tr y t o star t th e engine .
Doe s th e engin e start ?
Chec k fo r a n ope n in th e wir e o r
bulb :
1. Tur n th e ignitio n switc h OFF .2. Connec t th e EC M connecto r
termina l A 7 t o bod y groun d
with a jumpe r wire .3. Tur n th e ignitio n switc h O N (II) .
Is th e MI L on ?
Substitut e a known-goo d ECM ,
an d rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
the origina l ECM .
— Repai r shor t i n the wir e
betwee n No . 5 BACK-U P
LIGHTS , ALTERNATOR , TUR N
SIGNAL S (1 5 A ) fus e an d
gaug e assembly .
— Replac e No . 5 BACK-U P
LIGHTS , ALTERNATOR , TUR N
SIGNALS (15 A) fuse.
Chec k fo r a n ope n in th e wire s
(PG lines) :1. Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n
bod y groun d an d EC M con -
necto r terminal s A1 2 an d A2 5
individually .
I s ther e les s tha n 1. 0 V ?
Substitut e a known-goo d EC M
an d rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
th e origina l ECM . Repai
r ope n i n th e wire(s )
betwee n EC M an d G10 1 (locate d
a t intak e manifold ) tha t ha d
mor e tha n 1.0V .
— Repai r ope n i n th e wire s
betwee n EC M (A7 ) an d gaug e
assembly .— Replac e th e MI L bulb .
(cont'd )
Turn th e ignitio n switc h O N (II) .
The Malfunctio n Indicato r Lam p
(MIL ) neve r come s o n (eve n fo r
tw o seconds ) afte r ignitio n i s
turne d O N (II) .
ProCarManuals.com

Idle Spee d Settin g
Inspection/Adjustmen t
NOTE : Befor e settin g th e idl e speed , chec k th e thes e
items :
Th e MI L ha s no t bee n reporte d on .
Ignitio n timin g
Spark plug s
Air cleane r
PCV 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 o r position , M/ T in neutral ) unti l
th e radiato r fa n come s on , the n tur n th e ignitio n
switch 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
TACHOMETE R
CONNECTOR
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 . D o no t
depres s th e accelerato r pedal .
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 . Afte r adjustin g th e idl e speed ,
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
6. Disconnec t th e SC S servic e connector .
7 . Depres s th e accelerato r peda l an d stabiliz e th e
engin e spee d a t 1,00 0 rpm , the n slowl y releas e th e
peda l unti l th e engin e idles , the n chec k th e idl e
speed .
Idle spee d shoul d be :
Remov e th e rubbe r ca p fro m th e tachomete r
connecto r an d connec t a tachometer .
ProCarManuals.com

Intake Air System

Intake Air Bypass (IAB) Control System

Description

Satisfactory power performance is achieved by closing and opening the intake air bypass (IAB) control valves. High torque

at low engine speed is achieved when the valves are closed, whereas high power at high engine speed is achieved when

the valves are opened.

INTAKE AIR BYPASS (IAB) CONTROL

SOLENOID VALVE ON

ENGINE SPEED IS ABOVE 4,800 rpm

OPEN: HIGH ENGINE SPEED

CLOSED: LOW ENGINE SPEED

IAB CONTROL

SOLENOID

VALVE

To No. 5 BACK-UP LIGHTS

ALTERNATOR TURN SIGNALS

(15 A) FUSE

IAB

CONTROL

DIAPHRAGM

•IAB

CONTROL

VALVE
IAB

CHECK

VALVE

IAB

VACUUM

TANK
VARIOUS

SENSORSProCarManuals.com