1997 ACURA NSX Service Repair Manual

PGM-FI Main Relay

Description

The PGM-FI main relay actually contains two individual

relays.

The relay is located behind the passenger's seat back

panel.

One relay is energized whenever the ignition is on which

supplies the battery voltage to the ECM, power to the

fuel injectors, and power for the second relay.

The second relay is energized for 2 seconds when the

ignition is switched on, and when the engine is running

which supplies power to the fuel pump.

PGM-FI

MAIN RELAY
FUEL PUMP

RESISTOR

FUEL PUMP

FUEL

PUMP

RELAY
Relay Testing

NOTE: If the car starts and continues to run, the PGM-FI

main relay is OK.

1. Remove the PGM-FI main relay.

2. Attach the battery positive terminal to the No. 3*

terminal and the battery negative terminal to the

No. 2* terminal of the PGM-FI main relay. Then

check for continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

If there is continuity, go on to step 3.

If there is no continuity, replace the relay and

retest.

3. Attach the battery positive terminal to the No. 4 ter-

minal and the battery negative terminal to the No.

7* terminal of the PGM-FI main relay. Then check

that there is continuity between the No. 3 terminal

and No. 1 terminal of the PGM-FI main relay.

If there is continuity, go on to step 4.

If there is no continuity, replace the relay and

retest.

4. Attach the battery positive terminal to the No. 1 ter-

minal and battery negative terminal to the No. 2*

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

If there is continuity, the relay is OK;

If the fuel pump still does not work, go to

Harness Testing in the next column.

If there is no continuity, replace the relay and

retest.

(cont'd)ProCarManuals.com

Fuel Suppl y Syste m
PGM-F I Mai n Rela y (cont'd )
Troubleshootin g
Engine wil l no t start .
Inspectio n o f PGM-F I mai n
rela y an d rela y harness .
Chec k fo r a n ope n i n th e wir e
(PG 1 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PGM-F I mai n
rela y 4 P connecto r an d 8 P
connector .3. Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 8 P
connecto r termina l No . 7 an d
bod y ground .
I s ther e continuity ?
Chec k fo r a n ope n o r shor t i n th e
wir e (BA T line) :
Measur e voltag e betwee n th e
PGM-F I mai n rela y 4 P connecto r
terminal No . 3 an d bod y ground .
Is ther e batter y voltage ?
Chec k fo r a n ope n o r shor t i n th e
wir e (IGS W line) :
1. Tur n th e ignitio n switc h O N (II) .2. Measur e voltag e betwee n th e
PGM-F I mai n rela y 8 P connec -
tor termina l No . 5 an d bod yground .
PGM-FI MAI N RELA Y 8 P CONNECTO R
PG1(BLK )
Wire sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e PGM-F I mai n rela y an d G10 1
(locate d a t righ t middl e o f
engine) .
Replac e th e ACG(S ) (2 0 A )
fus e i n th e engin e compart -
men t fuse/rela y box .
Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F Imain rela y an d th e ACG(S )
(2 0 A ) fuse .
I s ther e batter y voltage ?
(T o pag e 11-145 ) Replac
e th e No . 2 FUE L
PUMP , SR S 2 (1 5 A ) fus e i n
th e under-das h fus e box .
Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I
mai n rela y an d th e No . 2 FUE L
PUMP , SR S 2 (1 5 A ) fuse .
ProCarManuals.com

(From pag e 11-144 )
Chec k fo r a n ope n i n th e wir e
(IGS W line) :
Measur e voltag e betwee n th e
PGM-F I mai n rela y 4 P connecto r
termina l No . 4 an d bod y ground .
I s ther e batter y voltage ? Replac
e th e I G COI L (3 0 A )
fus e i n th e engin e compart -
men t fuse/rela y box .
Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I
mai n rela y an d th e I G COI L
(3 0 A ) fuse .
Chec k fo r a n ope n o r shor t i n th e
wir e (ST S line) :
1 . Tur n th e ignitio n switc h t o th e
STAR T (III ) position .
NOTE:• M/T : Clutc h peda l mus t b e
depressed .
• A/T : Transmissio n in o r
position .
2 . Measur e th e voltag e betwee n
th e PGM-F I mai n rela y 8 P con -
necto r termina l No . 3 an d
bod y ground .
I s ther e batter y voltage ?
Replace th e No . 7 STARTE RSIGNAL (7. 5 A ) fus e i n th eunder-das h fus e box .Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I
mai n rela y an d th e No . 7
STARTE R SIGNA L (7. 5 A ) fuse .
Chec k fo r a n ope n i n th e wir e
(FLR 1 line) :1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e EC M connec -
to r A (26P ) fro m th e ECM .
3 . Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 8 P
connecto r termina l No . 2 an d
EC M connecto r termina l A4 .
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e EC M (A4 ) an d th e PGM-F I
mai n relay .
(cont'd )(To pag e 11-146 )
ProCarManuals.com

Fuel Suppl y Syste m
PGM-F I Mai n Rela y (cont'd )
(From pag e 11-145 )
Chec k fo r a n ope n i n th e wire s
(IG P lines) :
1 . Reconnec t th e EC M connecto r
A (26P) .2. Reconnec t th e PGM-F I mai n
rela y 4 P an d 8 P connectors .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n
EC M connecto r terminal s A1 3
an d A12 , an d betwee n C 1 an d
A12 .
Is ther e batter y voltage ? Repai
r ope n i n th e wir e
betwee n th e EC M (A13 , C D
an d th e PGM-F I mai n relay .
Replac e th e PGM-F I mai n
relay.
Check fo r a n ope n in th e ECM :
1 . Tur n th e ignitio n switc h OFF .
2 . Measur e voltag e betwee n
EC M connecto r terminal s A 4
an d A1 2 whe n th e ignitio nswitch i s firs t turne d o n (II ) fo r
tw o seconds .
I s ther e 1. 0 V or less ? 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 pre -
scribe d voltag e i s no w available ,
replac e th e origina l ECM .
Chec k th e PGM-F I mai n rela y
(se e pag e 11-143 ).
ProCarManuals.com

Fuel Tan k
Replacemen t
D o no t smok e whil e workin g o n fue l system . Kee p ope n flam e awa y fro m you r wor k area .
Mak e sur e lift s ar e place d properl y (se e sectio n 1 ).
1 . Rais e th e vehicle .
2 . Remov e th e drai n bolt , an d drai n th e fue l int o a n approve d container .
3 . Remov e th e cente r ro d (se e sectio n 5 ).
4 . Disconnec t th e M/ T shif t cabl e an d M/ T clutc h cabl e o r A/ T shif t cabl e fro m th e transmissio n (se e sectio n 14 ).
5 . Remov e th e bulkhea d panel s (se e sectio n 20 ) an d acces s panel .
6 . Disconnec t th e C48 6 (6P ) connector .
7 . Disconnec t th e hoses . Slid e bac k th e clamps , the n twis t th e hose s a s yo u pull , t o avoi d damagin g them .
8 . Plac e a jack , o r othe r support , unde r th e tank .
9 . Remov e th e stra p bolt s an d nuts , an d le t th e strap s fal l free .
10 . Remov e th e fue l tank . I f i t stick s o n th e undercoa t applie d t o it s mount , carefull y pr y i t of f th e mount .
11 . Instal l a ne w washe r o n th e drai n bolt , the n instal l part s i n th e revers e orde r o f removal .
C486 CONNECTO R (6P )
ACCES SPANELFUEL FILTE R
DRAIN BOL T
4 9 N- m (5. 0 kgf-m ,
36 Ibf-ft )
TANK STRAP S LOCKNU
T
2 1 N- m (2. 1 kgf-m ,15 Ibf-ft )
MOUNTIN G BOL T
3 8 N- m (3. 9 kgf-m , 2 8 Ibf-ft )
WASHE RReplace.
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Intake Ai r Syste m
System Descriptio n
The syste m supplie s ai r fo r al l engine needs. I t consist s o f th e intak e ai r pipe . Ai r Cleane r (ACL) , intak e ai r duct , throttl e
body , an d intak e manifold . A resonato r i n th e intak e ai r duc t provide s additiona l silencin g a s ai r i s draw n int o th e system .
IAB CONTRO L
SOLENOI D VALV E
To No . 5 BACK-U P LIGHT S
ALTERNATO R TUR N SIGNAL S
(1 5 A ) FUS E
IABCONTRO L
DIAPHRAG M
THROTTLE INTAK E
VALV E AI R DUC T
VARIOU SSENSOR S
ACL
IABCONTRO LVALVE
INTAK E
MANIFOL DRESONATO R
IABCHEC KVALV E
IABVACUU MTANK
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Air Cleaner (ACL)

ACL Element Replacement

ACL HOUSING

COVER

ACL ELEMENT

Normal conditions:

Replace air cleaner element every

30,000 miles (48,000 km) or 24

months whichever comes first.

Severe conditions:

Clean air cleaner element every

15,000 miles (24,000 km) or 12

months and replace every 30,000

miles (48,000 km) or 24 months

whichever comes first.
ACL HOUSING

RESONATOR

INTAKE

AIR DUCTProCarManuals.com

Intake Air System

Throttle Cable ———

Inspection/Adjustment

1. Remove the accelerator position sensor cover.

2. Check that the throttle cable operates smoothly with

no binding or sticking. Repair as necessary.

3. Check cable free play at the throttle linkage. Cable

deflection should be 10 - 12 mm (0.39 - 0.47 in.).

ACCELERATOR

POSITION

SENSOR COVER

DEFLECTION

10-12
mm

(0.39
-
0.47
in.
LOCKNUT

CABLE

BRACKET

ADJUSTING NUT

4. If deflection is not within specs, loosen the locknut,

turn the adjusting nut until the deflection is as spec-

ified then retighten the locknut.
Installation

1. Rotate the throttle linkage counterclockwise, then

install the throttle cable in the throttle linkage and

install the cable housing in the cable bracket.

THROTTLE LINKAGE

CABLE

BRACKET

INNER

WIRE

LOCKNUT
ADJUSTING

NUT

2. Hold the cable sheath, removing all slack from the

cable.

3. Turn the adjusting nut until it is 3 mm (0.12 in.)

away from the cable bracket.

4. Tighten the locknut. The cable deflection should now

be 10 - 12 mm (0.39 - 0.47 in.). If not, see inspection/

adjustment.

LOCKNUT

9.8 N-m

(1.0 kgf-m,

7.2 Ibf-ft)
ADJUSTING

NUT

CABLE

BRACKET

3 mm

(0.12 in.)ProCarManuals.com