1997 ACURA NSX ignition

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

Gauge Assembly

Coolant Temperature Gauge Test

Within two to five seconds,

does the temperature gauge

needle move to the Hot side?

Is there approx. 5 V?

1. Turn the ignition switch OFF.

2. Check for continuity between

ECM connector terminal A18

and gauge assembly connec-

tor terminal A12.

Is there continuity?
ECM CONNECTOR A (26P)

Wire side of female terminals

Substitute a known good ECM

and recheck. If the symptom/

indication goes away, replace

the original ECM.

Replace the coolant temperature

gauge.

Replace the coolant temperature

gauge.
GAUGE ASSEMBLY CONNECTOR A (30P)

Wire side of female terminals
Coolant temperature gauge nee-

dle does not move at all.

1. Turn the ignition switch OFF.

2. Connect ECM connector ter-

minal A18 to body ground

with a jumper wire.

3. Turn the ignition switch ON

(II).

1. Turn the ignition switch OFF.

2. Disconnect ECM connector A

(26P).

3. Turn the ignition switch ON

(II).

4. Measure voltage between

ECM connector terminal A18

and body ground.

Repair open in the wire between

ECM connector terminal A18 and

gauge assembly connector ter-

minal A12.ProCarManuals.com

Does the coolant temperature

gauge needle move correctly?

(you may have to watch it for

about 5 seconds.)

1. Turn the ignition switch OFF.

2. Turn the ignition switch ON

(II), and watch the coolant

temperature gauge again.

Does the coolant temperature

gauge needle immediately go

past the Hot mark?

Does the coolant temperature

gauge needle go past within

two to five seconds?

1. Turn the ignition switch OFF.

2. Disconnect the gauge assem-

bly connector A (30P).

3. Check for continuity between

ECM connector terminal A18

and gauge assembly connec-

tor terminal A12.

Is there continuity?
Substitute a known good ECM

and recheck. If the symptom/

indication goes away, replace

the original ECM.

Replace the coolant temperature

gauge.

Replace the coolant temperature

gauge.
ECM CONNECTOR A (26P)

Replace the coolant temperature

gauge.
GAUGE ASSEMBLY CONNECTOR A (30P)

Wire side of female terminals

Repair short in the wire between

ECM connector terminal A18 and

gauge assembly connector ter-

minal A12.
1. Turn the ignition switch OFF.

2. Disconnect ECM connector A

(26P).

3. Turn the ignition switch ON

(II), and watch the coolant

temperature gauge.
Coolant temperature gauge nee-

dle goes past the Hot mark.ProCarManuals.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

13. Install the injectors and fuel pipe assembly in the manifold.

14. Align the center line on the connector with the mark on the fuel pipe.

15. Install and tighten the retainer nuts.

16. Coat new O-rings with clean engine oil and put them on the fuel hose.

17. Connect the fuel hose to the fuel pipe.

18. Connect the vacuum hose and fuel return hose to the pressure regulator.

19. Install the connectors on the injectors.

20. Install the intake manifold covers.

21. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel

pressure in the fuel line rises. Repeat this two or three times, then check for leakage.ProCarManuals.com

Transmitter Test

NOTE:

• If the doors unlock or lock with the transmitter, but

the LED on the transmitter does not come on, the

LED is faulty; replace the transmitter.

• If any door is open, you cannot lock the door with the

transmitter.

• If you unlocked the doors with the transmitter, but do

not open any of the doors within 30 seconds, the

doors relock automatically.

• The doors do not lock or unlock with the transmitter

if the ignition key is inserted in the ignition switch.

1. Press the lock or unlock button five or six times to

reset the transmitter.

• If the locks work, the transmitter is OK.

• If the locks don't work, go to step 2.

2. Open the transmitter and recheck for water damage.

• If you find any water damage, replace the transmit-

ter.

• If there is no water damage, go to step 3.

3. Replace the transmitter battery with a new one, and

try to lock and unlock the doors with the transmitter

by pressing the lock or unlock button five or six

times.

• If the doors lock and unlock, the transmitter is OK.

• If the doors don't lock and unlock, go to step 4.

4. Reprogram and register the transmitter, then try to

lock and unlock the doors.

• If the doors lock and unlock, the transmitter is OK.

• If the doors don't lock and unlock, replace the trans-

mitter
Transmitter Programming

Storing transmitter codes:

The codes of up to three transmitters can be stored into

the keyless receiver unit memory. (If a fourth code is

stored, the code which was input first will be erased.)

NOTE: It is important to maintain the time limits

between the steps. Make sure the doors, hood and tail-

gate are closed.

1. Turn the ignition switch ON (II).

2. Within 1 to 4 sec., push the transmitter lock or

unlock button with the transmitter aimed at the key-

less receiver unit by the steering column.

3. Within 1 to 4 sec., turn the ignition switch OFF.

4. Within 1 to 4 sec., turn the ignition switch ON (II).

5. Within 1 to 4 sec., push the transmitter lock or

unlock button with the transmitter aimed at the key-

less receiver unit by the steering column.

6. Within 1 to 4 sec., turn the ignition switch OFF.

7. Within 4 sec., turn the ignition switch ON (II).

8. Within 1 to 4 sec., push the transmitter lock or

unlock button with the transmitter aimed at the key-

less receiver unit by the steering column.

9. Within 1 to 4 sec., turn the ignition switch OFF.

10. Within 4 sec., turn the ignition switch ON (II).

11. Within 1 to 4 sec., push the transmitter lock or

unlock button with the transmitter aimed at the key-

less receiver unit by the steering column.

12. Confirm you can hear the sound of the door lock

actuators. Within 1 to 4 sec., push the transmitter

lock or unlock button again.

13. Within 10 sec., aim the transmitters (up to two addi-

tional ones) whose codes you want to store at the

keyless receiver unit, and press the transmitter lock

or unlock buttons.

Confirm that you can hear the sound of the door

lock actuators after each transmitter code is stored.

14. Turn the ignition switch OFF, and pull out the key.

15. Confirm proper operation with the new code(s).ProCarManuals.com

Removal
NOTE:
• Befor e removin g th e belt , tur n th e crankshaf t pulle y
s o th e No . 1 pisto n i s a t to p dea d cente r (TDC ) (se e
pag e 6-19 ).
• Inspec t th e wate r pum p afte r removin g th e timin g
bel t (se e pag e 10-11 ).
• I f i t i s t o b e reused , mar k th e directio n o f rotatio n o n
th e belt .
• Replac e th e timin g bel t a t 105,00 0 mile s (168,00 0 km )
accordin g t o th e maintenanc e schedul e (norma l con -
ditions/sever e conditions) . I f th e vehicl e i s regularl y
driven i n on e o r mor e o f th e followin g conditions ,
replace th e timin g bel t a t 60,00 0 mile s (U.S.A. )
100,00 0 k m (Canada) .
— In ver y hig h temperature s (ove r 110°F , 43°C) .
— In ver y lo w temperature s (unde r -20°F , -29°C) .
1 . Disconnec t th e batter y negativ e termina l first , the n
th e positiv e terminal .
2 . Remov e th e righ t rea r wheel/tire .
3 . Remov e th e engin e oi l coole r bas e assembly .
NOTE : D o no t disconnec t th e hoses .
O-RINGReplace .
4. Remov e th e stru t brac e (se e pag e 5-3 ).
5 . Remov e th e intak e manifol d plat e an d to p cove r (se e
pag e 6-26 ). 4
. Remov e th e ignitio n coi l covers , th e injecto r cove r
an d th e wir e harnes s covers .
5 . Remov e th e ignitio n coil s an d th e connectors .
NOTE:
• Ther e ar e fron t an d rea r ignitio n coil s an d covers .
The y ca n b e identifie d b y th e mar k F F (front ) o r
RR (rear ) printe d o n them .
• Whe n installin g fron t an d rea r ignitio n coi l covers ,
attac h a rubbe r sea l t o th e intak e side .
HARNES SCOVERS
IGNITION COI LCOVE R
CONNECTO R
IGNITION COI L
6. Remov e th e expansio n tank .
NOTE : D o no t disconnec t wate r hoses .
EXPANSIO N TAN K
(cont'd )
ProCarManuals.com

22. Remove the breather hose, positive Crankcase venti-

lation (PCV) hose and vacuum hose.

VACUUM HOSE

PCV HOSE
BREATHER

HOSE

23. Remove the ignition coil cover and harness cover.

IGNITION COIL

COVER
24. Remove the water bypass hoses.

WATER BYPASS

HOSES

25. Remove the harness covers and ground cables from

the intake manifold.

GROUND CABLE

GROUND CABLE

(cont'd)ProCarManuals.com