alternator ACURA NSX 1997 Service Repair Manual

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

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
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4-6
This Maintenance Schedule outlines the minimum required maintenance. Ser\
vice at the indicated distance or time, whichever
comes first. Use the Maintenance Schedule for Severe Conditions if the v\
ehicle meets any of the qualifiers in the Severe
Conditions schedule or if the vehicle is normally driven in Canada.
Do the items in parts A, B, C, D, E, F, and G as required for the mileag\
e/time interval listed.
NOTE: According to state and federal regulations, failure to do the maintenanc\
e items marked with an asterisk (*) will not
void the customer ’s emissions warranties. However, Acura recommends that all maintenance s\
ervices be done at
the recommended interval to ensure long-term reliability.
*1: Refer to the 1997 NSX Service Manual, P/N 61SL006.
*2: Refer to the 1998 NSX Service Manual Supplement, P/N 61SL007.
*3: Refer to the 2001 NSX Service Manual Supplement, P/N 61SW000.
C
D
E
F
G Inspect and adjust drive belts, every 30,000 miles (48,000 km) or 2 ye\
ars.
•
Check for cracks and damage.
• Check deflection and tension at center of following belts pressing with\
98 N (10 kgf, 22 lbf) tension:
Alternator drive belt (see page 23-109)*
1: 11.0 – 13.5 mm (0.43 – 0.53 in.)
A/C compressor belt (see page 22-88)*1: 10 – 12 mm (0.39 – 0.47 in.)
Replace air cleaner element (see page 11-149)*1, every 30,000 miles (48,000 km).
Independent of time
Replace fuel filter (see page 11-138)*, *1, every 60,000 miles (96,000 km).
Replace spark plugs (see page 23-96)*1, every 105,000 miles (168,000 km).
Use PFR6G-11 (NGK) or PK20PR-L11 (DENSO); GAP 1.0 – 1.1 mm (0.039 – 0.043 in.).
Inspect the valve clearance (see page 6-10)*1, every 105,000 miles (168,000 km), otherwise adjust only if noisy.
Intake: 0.15 – 0.19 mm (0.006 – 0.007 in.), Exhaust: 0.17 – 0.21 mm (0.007 – 0.008 in.).
Replace timing belt (see page 6-14)*1 and inspect water pump (see page 10-11)*1,
every 105,000 miles (168,000 km) or 7 years.
Replace automatic transmission fluid (see page 14-105)*1 at 120,000 miles (192,000 km) or 6 years, then replace
every 90,000 miles (144,000 km) or 5 years.
Capacity: 2.9 L (3.1 US qt); use Honda ATF-Z1.
Replace manual transmission fluid (see page 13-3)*1, every 120,000 miles (192,000 km) or 6 years.
Capacity: 2.65 L (2.80 US qt); use Honda MTF.
Replace engine coolant (see page 10-2 )*3 at 120,000 miles (192,000 km) or 10 years, then every 60,000 miles (9\
6,000
km) or 5 years. Capacity: 12.0 L (3.2 US gal); use Honda All Season Antifreeze/Coolant\
Type 2.
Part Maintenance Items
Maintenance Schedule
Listed by Distance/Time for Normal Conditions
*05-NSX (61SW004)SEC04(01-10) 9/22/04 1:49 PM Page 4-6
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Removal (cont'd)
Engine Removal/Installation

47. Remove the two bolts from the side engine mount

near the alternator. Pivot the mounting bracket into

the housing of the body.
49. Remove the twelve subframe-to-body mounting

bolts.

50. Raise the car a few inches.

51. Check that all wires and hoses are disconnected

from the engine assembly.

52. Raise the car completely off the engine/suspension

assembly. Roll the assembly from under the car.

48. Remove the transmission mounting bolt.ProCarManuals.com

Timing Bel t
Remova l (cont'd )
7. Remov e th e breathe r hos e an d th e ai r cleaner hous-
in g (se e pag e 6-26 ).
8 . Disconnec t th e alternato r connecto r an d th e termi -
nal.
9. Remov e th e cover , adjustin g bolt , th e mountin g bol t
an d mountin g nut , the n remov e th e alternato r bel t
an d th e alternator .
COVER
ADJUSTIN GBOLT
ALTERNATO RBELT
12. Remov e th e transmissio n moun t (se e pag e 5-10 ).
13 . Instal l a brac e unde r th e engine , the n til t th e engin e
approximatel y 5 ° usin g a jack .
NOTE : Mak e sur e t o plac e a cushio n betwee n th e
oi l pa n an d th e jack .
14 . Remov e th e alternato r bracke t stiffene r an d dipstick /
pipe .
ALTERNATO R BRACKE TSTIFFENE R
DIPSTICK PIP E
10. Remov e th e cylinde r hea d covers .
• Refe r t o page s 6-49 , 6-5 0 whe n installing .
11 . Remov e th e tw o bolt s fro m th e sid e engin e moun t
nea r th e alternato r bracket . Pivo t th e mountin g bracke t
int o th e housin g o f th e body .
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Cylinder Head s
Remova l (cont'd )
26. Remov e th e engin e wir e harnes s connector s an d
wir e harnes s clamp s fro m th e cylinde r hea d an d
intak e manifold .
• Si x injecto r connector s
• Intak e ai r temperatur e (IAT ) senso r connecto r
• CKP/CY P senso r connecto r
• Heate d oxyge n senso r (HO2S ) connector s
• Ignitio n contro l modul e (ICM ) connector s
• Engin e coolan t temperatur e (ECT ) senso r connec -
tor
• Coolan t temperatur e gaug e sendin g uni t connec -
tor
• Radiato r fa n contro l senso r connecto r
• Exhaust gas recirculatio n (EGR ) valv e lift senso r
connecto r
• Throttl e positio n senso r connecto r
• Engin e oi l pressur e gaug e sendin g uni t connecto r
• Knoc k senso r connecto r
• VTE C solenoi d valv e connector s
• VTE C pressur e switc h connector s
• Engin e oi l pressur e switc h connecto r
• Alternato r connecto r
• Alternato r termina l
• Throttl e bod y 6 P connecto r
27 . Remov e th e ignitio n coil s an d connector .
28 . Remov e th e EG R pip e an d intak e manifol d assem -
bly.
GASKET SReplace.
INTAKEMANIFOL DASSEMBL Y
GASKETReplace .
29. Loose n th e adjustin g nu t an d idle r pulle y cente r nut ,
the n remov e th e ai r conditionin g compresso r bel t
(se e pag e 6-17 ).
30 . Remov e th e cover , adjustin g bolt , mountin g bol t
an d mountin g nut , the n remov e th e alternato r bel t
an d alternator .
COVER
ADJUSTIN GBOLT
MOUNTIN G BOL T
MOUNTIN G NU T
ALTERNATO RBELT
31. Disconnec t th e knoc k senso r connector , the n remov e
th e wir e holder .
KNOCK SENSO RWIRE HOLDE R
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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) .
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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

Exhaust Gas Recirculation (EGR) System

The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR

valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR vacuum control valve,

EGR control solenoid valve, ECM and various sensors.

The ECM contains memories for ideal EGR valve lifts for varying operating conditions. The EGR valve lift sensor detects

the amount of EGR valve lift and sends the information to the ECM. The ECM then compares it with the ideal EGR valve lift

which is determined by signals sent from the other sensors. If there is any difference between the two, the ECM varies cur-

rent to the EGR control solenoid valve to regulate vacuum applied to the EGR valve.

EGR

VALVE

LIFT

SENSOR
INTAKE

MANIFOLD

EGR

CONTROL

SOLENOID

VALVE
To No. 5 BACK-UP

LIGHTS ALTERNATOR

TURN SIGNALS

(15 A) FUSE

-EGR

VACUUM

CONTROL

VALVE

(cont'd)
EGR

VALVE

VARIOUS

SENSORSProCarManuals.com

Evaporative Emission (EVAP) Controls

Description

The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The

system consists of the following components:

A. Evaporative Emission (EVAP) Control Canister

An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the

EVAP control canister into the engine and burned.

B. Vapor Purge Control System

EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a port

on the throttle body. The purging vacuum is controlled by the EVAP purge control solenoid valve.

C. Fuel Tank Vapor Control System

When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and

regulates the flow of fuel vapor to the EVAP control canister.

From No. 5 BACK-UP

LIGHTS ALTERNATOR

TURN SIGNALS (15 A)

FUSE

FUEL TANK

EVAP VALVE
EVAP

BYPASS

SOLENOID

VALVE
VARIOUS

SENSORS

EVAP CONTROL

CANISTER

VENT SHUT VALVE

FUEL

TANK

PRESSURE

SENSOR
EVAP

TWO WAY

VALVE
EVAP CONTROL

CANISTER
EVAP PURGE

CONTROL

SOLENOID VALVE

(cont'd)
FUEL FILL

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