fuse ACURA NSX 1997 Service Repair Manual

Troubleshooting Procedure s
Checking th e Diagnosti c Troubl e Cod e (DTC )
wit h a n OB D II Sca n Too l o r th e Hond a PG M Teste r
When th e TC M sense s a n abnormalit y i n th e inpu t o r outpu t systems , th e indicato r ligh t i n th e gaug e assembl y wil l
blink . Whe n th e 16 P Dat a Lin k Connecto r (DLC ) (locate d t o th e lowe r lef t o f th e glov e compartment ) i s connecte d t o th e
OB D II Sca n Too l o r Hond a PG M Teste r a s shown , th e sca n too l o r teste r wil l indicat e th e Diagnosti c Troubl e Cod e (DTC )
whe n th e ignitio n switc h i s turne d O N (II) .
Whe n th e indicato r ligh t ha s bee n reporte d on , connec t th e OB D II Sca n Too l conformin g t o SA E J197 8 o r Hond a PG M
Teste r t o th e DL C (16P ) a t th e lowe r lef t o f th e glov e compartment . Tur n th e ignitio n switc h O N (II) , an d observ e th e DT C
o n th e scree n o f th e OB D II Sca n Too l o r Hond a PG M Tester . Afte r determinin g th e DTC , refe r t o th e electrica l syste m
Symptom-to-Componen t Char t o n page s 14- 8 an d 14-9 .
NOTE : Se e th e OB D II Sca n Too l o r Hond a PG M Teste r user' s manua l fo r specifi c instructions .
OBD II SCA N TOO L o r
HOND A PG M TESTE R
DATA LIN K CONNECTO R (16P )
Some PGM-F I problem s wil l als o mak e th e indicato r ligh t com e on . Afte r repairin g th e PGM-F I system , disconnec t th e
CLOC K fus e (7. 5 A ) i n th e under-hoo d fuse/rela y bo x fo r mor e tha n 1 0 second s t o rese t th e TC M memory , the n recheck .
NOTE : Disconnectin g th e CLOC K fus e als o cancel s th e radi o prese t station s an d th e cloc k setting . Mak e not e o f th e radi o
preset s befor e removin g th e fus e s o yo u ca n rese t them .
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Checking th e Diagnosti c Troubl e Cod e (DTC )
wit h th e Servic e Chec k Connecto r an d Specia l Too l
Whe n th e TC M sense s a n abnormalit y i n th e inpu t o r outpu t systems , th e indicato r ligh t i n th e gaug e assembl y wil l
blink .
Whe n th e Servic e Chec k Connecto r (2P ) (locate d to th e lowe r righ t o f th e glov e compartment ) i s connecte d wit h th e specia l
tool a s shown , th e indicato r ligh t wil l blin k th e Diagnosti c Troubl e Cod e (DTC ) whe n th e ignitio n switc h i s turne d O N (II) .
Whe n th e indicato r ligh t ha s bee n reporte d on , connec t th e Servic e Chec k Connecto r (2P ) t o th e specia l tool .
Then tur n th e ignitio n switc h O N (II ) an d observ e th e indicato r light .
INDICATO R
LIGH T
SCS SERVIC E CONNECTO R
07PA Z - 001010 0
SERVIC E CHEC KCONNECTO R (2P )
Code s 1 throug h 9 ar e indicate d b y individua l shor t blinks , code s 1 0 throug h 2 0 ar e indicate d b y a serie s o f lon g an d shor t
blinks . On e lon g blin k equal s 1 0 shor t blinks . Ad d th e lon g an d shor t blink s togethe r t o determin e th e code . Afte r deter -
minin g th e code , refe r t o th e electrica l syste m Symptom-to-Componen t Char t o n page s 14-8 an d 14-9 .
Som e PGM-F I problem s wil l als o mak e th e indicato r ligh t com e on . Afte r repairin g th e PGM-F I system , disconnec t th e
CLOC K fus e (7. 5 A ) i n th e under-hoo d fuse/rela y bo x fo r mor e tha n 1 0 second s t o rese t th e TC M memory , the n recheck .
NOTE : Disconnectin g th e CLOC K fus e als o cancel s th e radi o prese t station s an d th e cloc k setting .
Mak e not e o f th e radi o preset s befor e removin g th e fus e s o yo u ca n rese t them .
GAUG E ASSEMBL Y
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5. Inspec t th e circui t o n th e TC M accordin g t o th e troubleshootin g flowchar t wit h th e specia l tool s an d a digita l multime -
te r a s shown .
Ho w to us e th e Backprob e Se t
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
insulatio 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
wire sid e unti l i t come s in contac t wit h th e termina l en d o f th e wire .
DIGITA L MULTIMETE R(Commerciall y available )KS-AHM-32-003 .or equivalen t
TCM
BACKPROB E ADAPTE R
BACKPROB E SE T07SA Z-001000 A(Two required )
STACKIN G PATC H COR D
TCM Rese t Procedur e
1. Tur n th e ignitio n switc h OFF .
2. Remov e th e No . 3 3 CLOC K fus e (7. 5 A ) fro m th e under-hoo d fuse/rela y bo x fo r 1 0 second s t o rese t th e TCM .
NOTE :
• Disconnectin g th e No . 3 3 CLOC K fus e als o cancel s th e radi o prese t station s an d cloc k setting . Mak e not e o f th e
radi o preset s befor e removin g th e fus e s o yo u ca n rese t them .
• Th e TC M memor y canno t b e cleare d b y usin g th e OB D II sca n Too l o r Hond a PG M Tester ; b e sur e t o remov e th e
CLOC K fus e to rese t th e TCM .
CLOC K (7. 5 A )FUS E
UNDER-HOO DFUSE/RELAY BO X
Fina l Procedur e
NOTE : Thi s procedur e mus t b e don e afte r an y troubleshooting .
1. Tur n th e ignitio n switc h OFF .
2. Rese t th e TCM .
3. Disconnec t th e OB D II Sca n Too l o r Hond a PG M Teste r fro m th e Dat a Lin k Connector , o r remov e th e specia l too l fro m
th e Servic e Chec k Connector .
4 . Tur n th e ignitio n switc h O N (II) , an d se t th e radi o preset s an d cloc k setting .
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(DTC)*: The DTC s in th e parenthese s ar e th e number s th e indicato r ligh t indicate s whe n th e servic e chec k connecto r i s
connecte d to th e specia l too l (SC S servic e connector) .
If th e self-diagnosti c indicato r ligh t doe s no t blink , perfor m an inspectio n accordin g to th e tabl e below .
NOTE:
• I f a custome r describe s th e sympto m fo r cod e P179 0 (3) , ye t th e indicato r ligh t i s no t blinking , P170 6 (6) , o r P072 5
(11), i t wil l b e necessar y to recreat e th e sympto m by test-driving , the n recheckin g th e DTC .
• Sometime s th e indicato r ligh t an d th e Malfunctio n Indicato r Lam p (MIL ) ma y com e o n simultaneously . I f so , chec k
th e PGM-F I syste m accordin g t o th e DTC , the n rese t th e memor y b y removin g th e CLOC K fus e i n th e under-das h
fuse/rela y bo x fo r mor e tha n 1 0 seconds . Driv e th e vehicl e fo r severa l minute s a t a spee d ove r 3 0 mp h (5 0 km/h) , the n
rechec k th e DTC .
14-73
14-7 4
14-18
14-7 7
14-79
14-19
14-2 0
14-84
14-8 6
14-87
14-8 8
14-8 9
14-91
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Electrical Connection s
FUSES
BRAK E LIGHT S HOR N (20A )
TH L MOTO R (20A)* *
CLOC K (7.5A) *
AC G (120A)* *
ACG(S ) (20A)* *
I G COI L (30A)* *
No . 2 FUE L PUM P SRS 2 (15A )
No . 5 BACK-U P LIGHT S
ALTERNATO R
TURN SIGNAL S (15A )
STARTE R SIGNA L (7.5A)** *
AI R PUM P (60A)* * I
n th e under-hoo d fuse/rela y bo x
I n th e engin e compartmen t fuse/rela y bo x
I n th e under-das h fus e bo x
System Description
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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.

NOTE: If the CLOCK (7.5 A) fuse is removed when the ignition switch is in the ON (II) position, the MIL will come

on and the ECM will store a DTC.

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.ProCarManuals.com

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

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Component Location s
SERVICE CHEC KCONNECTO R (2P ) RIGHT-REA
R WHEE L SENSO R
UNDER-HOO D
FUSE/RELA Y BO X
RIGHT-FRON TWHEEL SENSO R
LEFT-REA RWHEEL SENSO R
UNDER-DAS H FUS E BO X
AB S MODULATO R
CONTROL UNI T
GAUG E ASSEMBL Y
AB S INDICATO R
LEFT-FRON TWHEEL SENSO R
UNDER-HOO D FUSE/RELA Y BO X
ABS(30 A ) FUS E
IG S W (A )(50 A ) FUS E BRAK
E LIGHTS/HOR N
(2 0 A ) FUS E
UNDER-DAS H FUS E BO X
ABS 1 , 4(2 0 A ) FUS E
BACK-U P LIGHT S
(ISA ) FUS E
HEATE R CONTRO L
(15 A) FUSE
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Relay an d Contro l Uni t Location s
Front Compartmen t
RADIATOR FA N HIG H RELA Y
UNDER-HOO D
RELAY BO X A
RADIATO R FA N LO W RELA Y
CONDENSE R FA NRELA Y
REVERS E LOCKOU T RELA Y (M/T )
WINDSHIEL D WIPE R
INTERMITTEN T RELA Y
WINDSHIEL D WIPE R
HIG H RELA Y
UNDER-HOO D
RELAY BO X B
WINDSHIEL D WIPE RLOW RELA Y
RIGHT HEADLIGH T RETRACTO R RELA Y
Wir e colors : BLU/GRN ,
BRN/WHT , BLU/RED ,
GRN/YEL , an d BL K
HEADLIGH T RELA Y
LEFT HEADLIGH T RETRACTO R RELA Y
Wir e colors : BLU/BLK ,
WHT/BLK , GRN/RED ,
BLU, and BL K
HOR N RELA YA/C COMPRESSO RCLUTCH RELA Y
POWER AMPLIFIE R RELA Y
BLOWE R MOTO R HIG H RELA Y
RIGH T HEADLIGH T RETRACTO R
CUT RELA Y
LEFT HEADLIGH TRETRACTO R CU T RELA Y
BLOWE R MOTO RRELAY
ABS MODULATO RASSEMBLY
WINDSHIEL D WASHE R
MOTO R RELA Y
DIMME R RELA Y
POWER WINDO W
RELAY
TAILLIGH T RELA Y
UNDER-HOO D FUSE/RELA Y BO X
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Lighting System

HID Lamp System Troubleshooting

1. Check the No. 49 (20 A) or No. 52 (20 A) fuse in the

main under-hood fuse/relay box.

Are the fuses OK?

YES — Go to step 2.

NO — Replace the fuse (s), and recheck.

2. Substitute a known-good HID bulb and recheck.

Does the headlight low beam come on?

YES — Replace the HID bulb.

NO — Go to step 3.

3. Disconnect the 2P connector from the inverter unit.

4. Turn the combination light switch ON.

5. Measure the voltage between the No. 2 terminal of

the inverter unit 2P connector and body ground.
7. Check for continuity between the No. 1 terminal of

the inverter unit 2P connector and body ground.

Is there continuity?

YES — Substitute a known-good inverter, and

recheck. If the symptom/indication goes away,

replace the original inverter unit.

NO — Repair open in the wire between the inverter

unit and body ground. If the wire is OK, check for

poor ground at G202 or G302.ProCarManuals.com