1997 ACURA NSX Service Repair Manual

NOTE: Differen t wire s wit h th e sam e colo r hav e bee n give n a numbe r suffi x t o distinguis h the m (fo r example , YEU/BLK1
an d YEL/BLK2 ar e no t th e same) .
Related to Fue l an d Emission s System .
— Connecto r wit h mal e terminal s (doubl e outline) : Vie w fro m termina l sid e
— Connecto r wit h femal e terminal s (singl e outline) : Vie w fro m wir e sid e (cont'd )
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System Description

System Connectors [Front Compartment and Under-dash] (cont'd)

UNDER-HOOD

FUSE/RELAY

BOX

SUB RELAY

BOX A

FRONT

COMPARTMENT

WIRE

HARNESS
UNDER-DASH

FUSE

BOX
SIDE

WIRE

HARNESS
FLOOR

WIRE

HARNESSProCarManuals.com

NOTE: Differen t wire s wit h th e sam e colo r hav e bee n give n a numbe r suffi x t o distinguis h the m (fo r example , YEU/BLK1
an d YEU/BLK2 ar e no t th e same) .
Related t o Fue l an d Emission s System .
— Connecto r wit h mal e terminal s (doubl e outline) : Vie w fro m termina l sid e
— Connecto r wit h femal e terminal s (singl e outline) : Vie w fro m wir e sid e
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Troubleshooting
Troubleshooting Procedure s
I. Ho w T o Begi n Troubleshootin g
Whe n th e Malfunctio n Indicato r Lam p (MIL ) ha s bee n reporte d on , o r ther e i s a driveabilit y problem , us e th e appropri -
at e procedur e belo w to diagnose and repai r th e problem .
MALFUNCTIO NINDICATORLAMP(MIL)
A. Whe n th e MI L ha s com e on :
1 . Connec t th e Hond a PG M Teste r o r a n OB D II
sca n too l t o th e 16 P Dat a Lin k Connecto r (DLC )
locate d unde r th e glov e bo x behin d a removabl e
cover .
2. Tur n th e ignitio n switc h O N (II) .
3. Chec k th e DT C an d not e it . Als o chec k an d not e
th e freez e fram e data . Refe r t o th e Diagnosti c
Troubl e Cod e Char t an d begi n troubleshooting .
NOTE:
See th e OB D I I sca n too l o r Hond a PG M
Teste r user' s manual s fo r specifi c operatin g
instructions .
Th e sca n too l o r teste r ca n rea d th e Diagnosti c Troubl e Code s (DTC) , freez e fram e data , curren t data , an d othe r
Engin e Contro l Modul e (ECM ) data .
Freez e fram e dat a indicate s th e engin e condition s whe n th e firs t malfunction , misfir e o r fue l tri m malfunctio n
was detected . I t ca n b e usefu l informatio n whe n troubleshooting .
B . Whe n th e MI L ha s no t com e on , bu t ther e i s a driveabilit y problem , refe r t o th e Sympto m Char t o n pag e 11-42 .
C . DTC s wil l b e indicate d b y th e blinkin g o f th e Malfunctio n Indicato r Lam p (MIL ) wit h th e SC S servic e connecto r con -
nected .
Connec t th e SC S servic e connecto r t o Servic e Chec k Connecto r a s shown . (Th e 2 P Servic e Chec k Connecto r i s
locate d unde r th e das h o n th e passenger' s sid e o f th e vehicle. ) Tur n th e ignitio n switc h o n (II) .
DAT A LIN K CONNECTO R (16P )SERVIC E CHEC KCONNECTO R (2P )
OBD II SCA N TOO L o r
HOND A PG M TESTE RSCS SERVIC E CONNECTO R07PAZ-001010 0
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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

Troubleshooting
Troubleshooting Procedure s (cont'd )
If th e inspectio n fo r a particula r cod e require s voltag e o r resistanc e check s a t th e EC M connectors , remov e th e bulkhea d
panels . Unbol t th e ECM . Chec k th e syste m accordin g t o th e procedur e describe d fo r th e appropriat e code(s ) liste d o n th e
followin g pages .
ECM
BULKHEA DPANELS
How to Us e th e Backprob e Set s
Connec t th e backprob e adapter s t o th e stackin g patc h cords , an d connec t th e cord s t o a multimeter . Usin g th e wir e insula -
tio n a s a guid e fo r th e contoure d ti p o f th e backprob e adapter , gentl y slid e th e ti p int o th e connecto r fro m th e wir e sid e
unti l i t come s i n contac t wit h termina l en d o f th e wire .
DIGITA L MULTIMETE R(Commerciall y available ) o rKS - AH M - 3 2 - 00 3
STACKIN G PATC HCORD
BACKPROB E SE T
07SA Z - 001000 A (tw o required ) BACKPROB E ADAPTE R
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CAUTION:

Puncturing the insulation on a wire can cause poor or intermittent electrical connections.

Bring the tester probe into contact with the terminal from the connector side of wire harness connectors in the engine

compartment. For female connectors, just touch lightly with the tester probe and do not insert the probe.

RUBBER SEAL

WIRE HARNESS

TERMINAL
TESTER PROBEProCarManuals.com

Troubleshooting
Troubleshooting Procedure s (cont'd )
Sympto m Char t
Liste d belo w ar e symptom s an d probabl e cause s fo r problem s tha t D O NO T caus e th e Malfunctio n Indicato r Lam p (MIL ) t o
com e on .
I f th e MI L wa s reporte d on , g o to pag e 11-38 .
Troubleshoo t eac h probabl e caus e in th e orde r liste d (fro m lef t t o right ) unti l th e sympto m is eliminated .
Th e probabl e caus e an d troubleshootin g pag e referenc e ca n b e foun d o n nex t page .
Othe r Probabl e Causes :
Engin e wil l no t start
— Compressio n
— Engin e locke d u p
— Timin g bel t
— Startin g syste m
— Overheatin g
— Batter y Troubleshoo
t fo r misfir e o n page s 11-90 , 11-9 4
PROBABL E CAUS ESYMPTO M
Engine wil l no t start
Har d startin g
Col d fas t idl e to o lo w
Col d fas t idl e to o hig h
Idl e spee d fluctuate s
Misfir e o r roug h runnin g
Lo w powe r
Engin e stall s4,2,3,5,19,13, 1
2,4,10,12,1 8
7,6
7,9, 8
7,9,8
2,8,9 , 11,16 , 15,17,1 0
2,4,10 , 19,7,5 , 1 4
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