1991 ACURA NSX service

Pressure Regulator
Description

The fuel pressure regulator maintains a constant fuel
pressure to the injectors. When the difference between
the fuel pressure and manifold pressure exceeds 3.5
kg/cm2 (50 psi), the diaphragm is pushed upward, and

the excess fuel is fed back into the fuel tank through the
return line.

CLOSE
Testing
Do not smoke during the test. Keep
open flames away from your work area.

1. Attach a pressure gauge to the service port of the
fuel filter (page 11-88).
Pressure should be:

323-363
kpa
(3.30-3.70
kg/cm2.
46-53
psi)
(with the regulator vacuum hose disconnected)
PRESSURE FUEL PRESSURE GAUGE
REGULATOR
07406-0040001

INTAKE MANIFOLD

VACUUM

DIAPHRAGM

FUEL
INLET
2. Reconnect the vacuum hose to the pressure
regulator.

OPEN

INTAKE MANIFOLD

VACUUM

DIAPHRAGM

FUEL
INLET
(cont'd)ProCarManuals.com

Fuel Filter
Replacement Do not smoke while working on fuel
system. Keep open flame away from work area.

The filter should be replaced: every 4 years or 60,000
miles (96,000 km), whichever comes first or whenever

the fuel pressure drops below the specified value

(323–363
kPa,
3.30–3.70
kg/cm2,
46–53
psi
with

the pressure regulator vacuum hose disconnected) after

making sure that the fuel pump and the pressure

regulator are OK.

1. Place a shop towel under and around the fuel filter.

2. Relieve fuel pressure (page 11-87).
3. Remove the 12 mm banjo bolt and the fuel feed
pipe from the filter.

4. Remove the fuel filter clamp and fuel filter.
5. When assembling, use new washers, as shown.

WASHER
Replace

WASHER
Replace

10 N·m(1.0 kg-m, 7 Ib-ft)
SERVICE BOLT

12 N·m (1.2 kg.m, 9 Ib-ft)
BANJO BOLT28 N·m (2.8 kg-m, 20 Ib-ft)
WASHER
Replace

28 N·m

(2.8
kg-m,

20 Ib-ft)ProCarManuals.com

Fuel Supply System
Fuel Pump (cont'd)
Testing Do not smoke during the test. Keep open
flame away from your work area.

1. With the ignition switch OFF, disconnect the main
relay connector.
2. Connect a jumper wire between the BLK/YEL wire and BLK/YEL wire .
Replacement
Do not smoke while working on fuel
system. Keep open flames away from your work area.

1. Remove the fuel tank (page 11 -108).

2. Disconnect the connector from the fuel pump.

3. Remove the fuel pump mounting nuts.

4. Remove the fuel pump from the fuel tank.

BLK/YEL
28 N·m (2.8 kg-m, 20 Ib-ft)

6 N·m
(0.6 kg-m,

4 Ib-ft)

BLK/YEL

Jumper wire

FUEL PUMP
FUEL PUMP

BRACKET

3. Relieve fuel pressure as described on page 11-87
then tighten the service bolt.

4. Disconnect the fuel return hose from the regulator.
5. Turn the ignition switch ON for 10 seconds and
measure the amount of fuel flow.

Amount should be: 333 cm3 (11.2 oz) min. in 10 seconds at 12 V

PRESSURE REGULATOR
If fuel flow is less than 333 cm3 (11.2 oz), or


there is no fuel flow, check for:

Clogged fuel filter.

Clogged fuel line.
Pressure regulator failure (page 11-95).ProCarManuals.com

Comes on and remains on while running:
1. Stop the engine.
2. Turn the ignition switch on and make sure that the anti-lock brake system indicator light comes on.
3. Restart the engine and check the anti-lock brake system indicator light.
There is no problem in the anti-lock brake system, if the anti-lock brake system indicator light goes off. Go to step 4, if the anti-lock brake system indicator light remains on.

4. Stop the engine.
5. Disconnect the service check connector from the connector cover located under the glove box.
Connect the two terminals of the service check connector with a jumper wire.
6. Turn the ignition switch on, but do not start the engine. 7. Record the blinking frequency of the anti-lock brake system indicator light.
The blinking frequency indicates the problem code.
CAUTION: Before starting the engine, disconnect the jumper wire from the service check connector, or else the
Check Engine light will stay on with the engine running.

Turn the ignition

switch on
PROBLEM CODE:

4– 2

Main Code: 4

Sub-Code: 2
PROBLEM

CODE: 1

Main Code: 1

Sub-Code: none
PROBLEM CODE

7–2

Main Code: 7

Sub-Code: 2

Indicator

light on

Indicator

light off
Connect the

jumper wire
2

Second

pause
1

Second

pause
5 second

pause

5 second

pause

1

Second

pause

1 Second

NOTE:
The control unit can indicate three problem codes (one, two or three problems). If the anti-lock brake system indicator light does not light, see Troubleshooting of Anti-lock Brake System
Indicator Light Circuit page 19-44.
If you miscount the blinking frequency, turn the ignition switch off, then turn on to blink the anti-lock brake
system indicator light again. After the repair is completed, disconnect the ALB 2,3 (No. 32) fuse for at least 3 seconds to erase the control

unit's memory. Then turn the ignition key on again and recheck.
The memory is erased if the connector is disconnected from the control unit or the control unit is removed from
the body. After recording the main and sub-code (if applicable), refer to the Symptom-to-System Chart.

ANTI-LOCK BRAKE SYSTEM INDICATOR LIGHT
SERVICE CHECK CONNECTOR

JUMPER WIREProCarManuals.com

Warning/Caution Labels

A: CABLE REEL CAUTION A

CAUTION:

BEFORE INSTALLING CABLE REEL

CENTER THE FRONT WHEELS.

ALIGN THE MARKS.

READ SERVICE MANUAL.

B: CABLE REEL CAUTION B

CAUTION:

NO SERVICEABLE PARTS INSIDE; DO NOT

DISASSEMBLE OR TAMPER.

C: STEERING WHEEL WARNING

WARNING

BEFORE INSTALLING STEERING WHEEL:

CENTER THE FRONT WHEELS.

ALIGN THE MARKS. (CABLE REEL)

READ SERVICE MANUAL.

D: BULKHEAD WARNING

WARNING

THIS VEHICLE IS EQUIPPED WITH A DRIVER

AIRBAG AS A SUPPLEMENTAL RESTRAINT

SYSTEM. (SRS)

ALL SRS ELECTRICAL WIRING AND CONNECTORS

ARE COLORED YELLOW.

DO NOT USE ELECTRICAL TEST EQUIPMENT ON

THESE CIRCUITS. TAMPERING WITH OR DISCON-

NECTING THE SRS WIRING COULD RESULT IN

ACCIDENTAL FIRING OF THE INFLATOR OR MAKE

THE SYSTEM INOPERATIVE, WHICH MAY RESULT

IN SERIOUS INJURY.
(SUN VISOR)ProCarManuals.com

E: MODULE WARNING

WARNING

TO PREVENT ACCIDENTAL DEPLOYMENT AND POSSIBLE

INJURY:

ALWAYS INSTALL THE PROTECTIVE SHORT CONNEC-

TOR ON THE INFLATOR CONNECTOR WHEN THE

HARNESS IS DISCONNECTED.

UNDER NO CIRCUMSTANCES SHOULD DIAGNOSIS BE

PERFORMED USING ELECTRICAL TEST EQUIPMENT OR

PROBING DEVICES.

NO SERVICEABLE PARTS INSIDE. DO NOT DISASSEMBLE

OR TAMPER.

STORE THE REMOVED AIRBAG ASSEMBLY WITH THE

PAD SURFACE UP.

FOR SPECIAL HANDLING OR STORAGE REFER TO THE

ACURA SERVICE MANUAL.

DISPOSE OF THE ENTIRE UNIT AS DIRECTED.

F: DRIVER INFORMATION

ALWAYS WEAR YOUR SEAT BELT

THIS CAR IS EQUIPPED WITH A DRIVER AIRBAG AS A

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

IT IS DESIGNED TO SUPPLEMENT THE SEAT BELT.

BEFORE DRIVING READ LABEL INSIDE THE GLOVE

BOX.

G: SRS UNIT CAUTION

CAUTION

NO SERVICEABLE PARTS INSIDE.

DO NOT DISASSEMBLE OR TAMPER.

DO NOT DROP.

STORE IN A CLEAN, DRY AREA.

H: STEERING COLUMN CAUTION

CAUTION

TO AVOID DAMAGING THE SRS CABLE OR REEL, WHICH

COULD MAKE THE SYSTEM INOPERATIVE, REMOVE THE

STEERING WHEEL BEFORE REMOVING THE STEERING

SHAFT CONNECTOR BOLT.

I: POCKET INFORMATION

DRIVER'S AIRBAG INFORMATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) CAN

PROVIDE ADDITIONAL PROTECTION FOR THE DRIVER

IN A FRONTAL COLLISION. A FUNCTIONAL

DESCRIPTION OF THE SRS IS IN YOUR OWNER'S

MANUAL.

THE SYSTEM MUST BE INSPECTED TEN YEARS AFTER

DATE OF MANUFACTURE, AS NOTED ON THE

CERTIFICATION PLATE.

ANY REPAIR, INSPECTION OR NEARBY ACCESSORY

INSTALLTION SHOULD BE DONE BY AN ACURA

DEALER.

IF YOUR SRS INDICATOR:

LIGHTS WHILE DRIVING OR FLASHES;

FAILS TO LIGHT OR STAYS ON AFTER THE IGNITION

IS FIRST TURNED ON:

SEE YOUR AUTHORIZED ACURA DEALER.
J: STEERING WHEEL WARNING

WARNING

TO PREVENT ACCIDENTAL DEPLOYMENT AND POSSIBLE

INJURY:

ALWAYS INSTALL THE PROTECTIVE SHORT CONNEC-

TOR ON THE INFLATOR CONNECTOR WHEN THE

HARNESS IS DISCONNECTED.

K: LABEL

L: INFLATOR LABEL

DANGER CONTAINS SODIUM AZIDE AND POTASSIUM

NITRATE.

CONTENTS ARE EXTREMELY FLAMMABLE.

DO NOT DISMANTLE OR INCINERATE.

DO NOT PROBE WITH ELECTRICAL DEVICES.

M: INFLATOR COVER LABEL

DANGER

EXPLOSIVE/FLAMMABLE SRS

CONTACT WITH ACID, WATER, OR HEAVYMETALS

SUCH AS COPPER, LEAD, OR MERCURY, MAY PRODUCE

HARMFUL AND IRRITATING GASES OR EXPLOSIVE COM-

POUNDS. STORAGE TEMPERATURES MUST NOT EX-

CEED
200°F.
FOR
PROPER
HANDLING,
STORAGE,
AND

DISPOSAL PROCEDURES REFER TO THE ACURA SERVICE

MANUAL, SRS SUPPLEMENT.

POISON

CONTAINS POISONOUS SODIUM AZIDE AND

POTASSIUM NITRATE.

FIRST AID:

IF CONTENTS ARE SWALLOWED, INDUCE VOMITING.

FOR EYE CONTACT, FLUSH EYES WITH WATER FOR 1 5

MINUTES. IF GASES (FROM ACID OR WATER CONTACT)

AIR INHALED, SEEK FRESH AIR. IN EVERY CASE, GET

PROMPT MEDICAL ATTENTION.

KEEP OUT OF REACH OF CHILDREN.ProCarManuals.com

Ignition system

Component Location Index

IGNITION TIMING CONTROL SYSTEM
Troubleshooting, section 11Inspection and setting, page 23-91
Description, page 23-89

RADIO NOISE CONDENSER

Test, page 23-97
SPARK PLUGS (6)

Inspection, page 23-96
TACHOMETER CONNECTOR

(Engine revolution detected)

CYL/CRANK SENSOR
Troubleshooting, section 11 Replacement, section 5
IGNITION COILS (6) Removal, page 23-94 Test, page 23-95
IGNITER UNIT
Replacement, page 23-92Input Test, page 23-93 Troubleshooting, Section 11

SERVICE LOOPProCarManuals.com