ACURA NSX 1991 Service Repair Manual

System Description

System Connectors [Behind the bulkhead panels]ProCarManuals.com

NOTE:
•
Different wires
with
the
same color have been given
a
number suffix
to
distinguish
them
(for example,

YEL/BLK1 and YEL/BLK
2 are not the same).

Related to Fuel and Emissions System.
• — Connector with male terminals (double outline): View from terminal side
— Connector with female terminals (single outline): View from wire sideProCarManuals.com

System Descriptio n
System Connector s [Fron t Compartmen t an d Under-dash ]
ProCarManuals.com

NOTE:
•
Different wires
with
the
same color have been given
a
number suffix
to
distinguish them
(for
example,

YEL/BLK1 and YEL/BLK2 are not the same).

Related to Fuel and Emissions System.

• — Connector with male terminals (double outline): View from terminal side

— Connector with female terminals (single outline): View from wire sideProCarManuals.com

System Description

System Connectors [Front Compartment and Under-dash]ProCarManuals.com

NOTE:
•
Different wires
with
the
same color have been given
a
number suffix
to
distinguish
them
(for example,

YEL/BLK1 and YEL/BLK
2 are not the same).

Related to Fuel and Emissions System.

• — Connector with male terminals (double outline): View from terminal side

— Connector with female terminals (single outline): View from wire sideProCarManuals.com

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 is a driveabilit y problem , us e th e appropri -
at e procedur e belo w to diagnos e an d repai r th e problem .
MALFUNCTIO NINDICATOR
LAM P
(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 OBD-I I
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 ON .
3 . Hond a PG M Tester : Begi n troubleshootin g a s
indicate d b y th e tester . Th e DT C troubleshootin g
flowchart s ar e no t neede d wit h th e tester ; follo w
th e tester' s prompts .
OBD-I I sca n tool : 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:
• Se e th e OBD-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
wa s 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 is 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 car. ) Tur n th e ignitio n switc h on .
DAT A LIN K CONNECTO R (16P )SERVIC E CHEC KCONNECTO R (2P )
OBD-I I SCA N TOO L o r
HOND A PG M TESTE R SC
S SERVIC E CONNECTO R
07PA Z - 001010 0
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II. 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.

NOTE: 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,ProCarManuals.com

Troubleshooting
Troubleshooting Procedure s
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 D
PANEL S
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 r
KS - AH M - 32 - 00 3
STACKIN G PATC HCORD
BACKPROB E SE T07SA 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
TESTER PROBE

WIRE HARNESS

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