1997 ACURA NSX fuse box

Engine Control Module (ECM) Reset Procedure

Either of the following actions, will reset the ECM.

Using the OBD II scan tool or Honda PGM Tester to clear the ECM's memory.

NOTE: See the OBD II scan tool or Honda PGM Tester user's manuals for specific operating instructions.

Turn the ignition switch OFF. Remove the CLOCK (7.5 A) fuse from the under-hood fuse/relay box for 10 seconds.

UNDER-HOOD

FUSE/RELAY BOX
CLOCK

(7.5 A) FUSE

III. Final Procedure (this procedure must be done after any troubleshooting)

1. Remove the SCS Service Connector if it is connected. If the SCS service connector is connected and there are no

DTCs stored in the ECM, the MIL will stay on when the ignition switch is turned on.

2. Do the ECM Reset Procedure.

3. Turn the ignition switch OFF.

4. Disconnect the OBD II scan tool or Honda PGM Tester from the Data Link Connector (16P).

IV. Known-Good ECM Substitution

The ECM is part of the immobilizer system. If you substitute a known-good ECM, the ECM will have a different immo-

bilizer code. In order for the engine to start, you must rewrite the immobilizer code with the Honda PGM Tester.

(cont'd)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

(From pag e 11-62 )
Chec k fo r a shor t i n th e wir e (MI L
line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EC M connec -
to r A (26P) .
3. Tur n th e ignitio n switc h O N (II) .
Is th e MI L ON ?Repai r shor t t o bod y groun d i n
th e wir e betwee n th e EC M (A7 )
and MIL .
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
the origina l ECM .
(From pag e 11-62 )
Inspec t ACG(S ) (2 0 A ) fus e i n th e
engin e compartmen t fuse/rela ybox.
Is th e fus e OK ? Repai
r shor t i n th e wir e
betwee n ACG(S ) (2 0 A ) fus e
an d PGM-F I mai n relay .
Replac e ACG(S ) (2 0 A ) fuse .
Inspec t I G COI L (3 0 A ) fus e i n th e
engin e compartmen t fuse/rela ybox.
Is th e fus e OK ? Repai
r shor t i n th e wir e
betwee n I G COI L (3 0 A ) fus e
an d PGM-F I mai n relay .
Replac e IG COI L (3 0 A ) fuse .
Chec k fo r a shor t i n a sensor :
1. Tur n th e ignitio n switc h O N (II) .2. Disconnec t th e 3 P connecto r
o f eac h senso r on e a t time :
• MA P senso r
• T P senso r
• EG R valv e lif t senso r• Fue l tan k pressur e senso r
Doe s th e MI L remai n ON ? Replac
e th e senso r tha t cause d
the ligh t t o g o out .
(To pag e 11-64 )(cont'd )
ProCarManuals.com

Idle Control System

Starter Switch Signal

This signals the ECM when the engine is cranking.

NOTE:

• M/T: Clutch pedal must be depressed.

• A/T: Transmission in or position.

Is there battery voltage?

Is the fuse OK?
Repair short in the wire

between the ECM (C6) and

the No. 7 STARTER SIGNAL

(7.5 A) fuse or the PGM-FI

main relay.

Replace the No. 7 STARTER

SIGNAL (7.5 A) fuse.
Inspection of Starter Switch Sig-

nal.

Check for an open or short in the

wire (STS line):

Measure voltage between ECM

connector terminals C6 and A26

with the ignition switch in the

start (III) position.

Starter switch signal is OK.

Repair open in the wire between

the ECM
(C6)
and the No. 7

STARTER SIGNAL (7.5 A) fuse.
Inspect the No. 7 STARTER SIG-

NAL (7.5 A) fuse in the under-

dash fuse box.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

EVAP Control Canister Removal/Installation

1. Remove the air cleaner housing.

2. Remove the engine compartment fuse/relay box

mounting bolts and harness clip.

AIR CLEANER

HOUSING

HARNESS CLIP

3. Remove the EVAP control canister bracket mount-

ing bolts.

4. Disconnect the hoses and connector from the EVAP

control canister.

5. Remove the dust filter from the dust filter bracket.

6. Remove the EVAP control canister and brackets.
EVAP CONTROL

CANISTER

DUST FILTER

BRACKET
EVAP CONTROL

CANISTER

BRACKET

DUST FILTER

7. Install the EVAP control canister in the reverse order

of removal.ProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Tw o Wa y Valv e Testin g
1 . Remov e th e fue l fil l cap .
2 . Remov e th e vapo r lin e fro m th e EVA P tw o wa y
valv e (locate d unde r th e engin e compartmen t
fuse/rela y box) , an d connec t i t t o a T-fittin g fro m a
vacuu m gaug e an d a vacuu m pum p a s shown .
VACUUM/PRESSUR E
GAUGE ,
0-4in.H g07JAZ-001000 B
VACUUM PUMP /GAUGE
A973 X - 04 1 -
XXXX X
3. Appl y vacuu m slowl y an d continuousl y whil e
watchin g th e gauge . Th e vacuu m shoul d stabiliz e
momentaril y a t 0. 8 - 2. 1 kP a (6-1 6 mmHg , 0. 2 - 0. 6
in.Hg) .
I f th e vacuu m stabilize s (valv e opens ) belo w
0. 8 kP a ( 6 mmHg , 0. 2 in.Hg ) o r abov e 2. 1 kP a
(1 6 mmHg , 0. 6 in.Hg) , instal l a ne w valv e an d retest .
4 . Mov e th e vacuu m pum p hos e fro m th e vacuu m fit -
tin g t o th e pressur e fitting , an d mov e th e vacuu m
gaug e hos e fro m th e vacuu m sid e t o th e pressur e
sid e a s shown .
PRESSUR ESIDE
5. Slowl y pressuriz e th e vapo r lin e whil e watchin g th e
gauge . Th e pressur e shoul d b e stabiliz e momentaril y
abov e 1. 0 kP a ( 8 mmHg , 0. 3 in.Hg) .
I f th e pressur e momentaril y stabilize s (valv e
opens ) abov e 1. 0 kP a ( 8 mmHg , 0. 3 in.Hg) , th e
valv e is OK .
I f th e pressur e stabilize s belo w 1. 0 kP a ( 8 mmHg ,
0. 3 in.Hg) , instal l a ne w valv e an d retest .
T-FITTIN G
ProCarManuals.com