relay ACURA NSX 1997 Service Repair Manual

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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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

SENSORProCarManuals.com

Interior Tri m
Replacemen t
Coupe:
Disassembl e in numbere d sequence .
NOTE:
• Whe n removin g th e rea r tri m panels , tak e car e no t t o
damag e th e contro l unit s an d relays .
• Tak e car e no t t o scratc h th e tri m panels .
Installatio n i s th e revers e o f th e remova l procedure .
NOTE :
• I f necessary , replac e an y damage d clips .
• Mak e sur e th e chil d sea t tethe r ancho r i s
installe d securely .
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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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Engine Compartment

AIR PUMP RELAY

Wire colors: YEL/BLK,

BLK,
WHT and BLKProCarManuals.com

Radiator

Engine Coolant Refilling and Bleeding

CAUTION: When pouring engine coolant, be sure to

shut the relay box lid and not let coolant spill on the

electrical parts or the paint. If any coolant spills, rinse it

off immediately.

NOTE:

• Perform this maintenance when the engine is cool.

• Before replacing the coolant, turn the ignition ON,

slowly turn the climate control temperature knob to

90° and turn off the ignition. This will allow the

coolant in the heater to drain out with the rest of the

system.
1. Open the hood, the rear window and the engine

cover.

2. Remove the cover protecting the water pipes and

shift cables on the underside of the car.

3. Before removing the expansion tank cap, first

loosen the cap to lower pressure.

CAUTION: Do not remove the expansion tank cap

when engine is hot. The coolant is under pressure

and may blow out and scald you. Open the cap

slowly when the engine is cool.

4. Loosen the drain plug in the bottom of the radiator,

and drain the coolant.

5. Remove the two drain bolts from the water pipes,

and drain the coolant.

DRAIN BOLTS

15 N-m (1.5 kgf-m, 11 Ibf-ft)
DRAIN HOLE
DRAIN PLUG

WASHERS

Replace.ProCarManuals.com

Relay an d Contro l Uni t Location s
Front Compartmen t
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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

Headlight Low Beam Relay Test

1. Remove the headlight low beam relay from the

under-hood fuse/relay box.

2. Check continuity at the relay terminals.

• There should be continuity between the C and D

terminals.

• There should be continuity between the A and B

terminals when power and ground are connect-

ed to the C and D terminals.

• There should be no continuity between the A

and B terminals when power is disconnected.
Headlight High Beam/Dimmer

Relay (USA) Test

1. Remove the headlight high beam relay or the dimmer

relay (USA) from the under-hood fuse/relay box.

2. Check continuity at the relay terminals.

• There should be continuity between the C and D

terminals.

• There should be continuity between the A and B

terminals when power and ground are connect-

ed to the C and D terminals.

• There should be no continuity between the A and

B terminals when power is disconnected.

• Headlight high beam relay

• Dimmer relay (USA)ProCarManuals.com