ACURA NSX 1991 Service Repair Manual

BRACKET BEAM
COTTER PIN

Replace.

SELECT

LEVER PIN SELECT LEVER
MOUNTING BOLT
SHIFT CABLE

HOLDER

6 x 1.0 mm
12 N .
m

(1.2 kg-m, 9 Ib-ft)

6 x 1.0 mm

8 N .
m (0.8 kg-m, 6 Ib-ft)
SHIFT CABLECLAMPS
SHIFT CABLE

COVER

LOCK PIN
Install in this
direction. CONTROL

LEVER
LEVER
CONTROL

SRS MAIN

HARNESS Make sure lifts are placed properly.
1. Remove the center console panel (see section 20).

2. Remove the shift cable by removing the cotter pin and
selector lever pin from the selector lever, and mount-

ing bolts from the bracket beam.

3. Remove the shift cable clamps.

4. Remove the shift cable holder and shift cable cover.
5. Remove the shift cable by removing the lock pin and
control lever pin from the control lever.

CAUTION: Take care not to bend the calbe when
removing it.
6. Install the shift cable in the reverse order of removal.
7. Check the cable adjustment on reassembly, on page
14-157.

Shift Cable
Removal/Installation
All SRS wiring harnesses are covered with yellow
outer insulation.Before disconnecting any part of the SRS wire
harness, install the short connectors (see page
23-328).

Replace the entire affected SRS harness assembly if
it has an open circuit or damaged wiring.
CAUTION:

PINProCarManuals.com

Gearshift Selector

All SRS wiring harnesses are covered with yellow

outer insulation.
Before disconnecting any part of the SRS wire

harness, install the short connectors (see page
23-328).

Replace the entire affected SRS harness assembly if

it has an open circuit or damaged wiring.

CAUTION:

SELECT LEVER KNOB
3 N.
m

(0.3 kg-m, 2 Ib-ft)
SRS MAIN

HARNESS

SILICONE GREASE

3 N .
m

(0.3 kg-m, 2 Ib-ft)
Apply non hardening
thread lock sealant.
SHIFT INDICATOR PANEL
KEY CYLINDER

3 N .
m

(0.3 kg-m, 2 Ib-ft)

5 N.
m (0.5 kg-m, 4 Ib-ft)

A/T GEAR
POSITION

SWITCH

SILICONE

GREASE

LEVER COVER

SHIFT INDICATOR
3 N .
m (0.3 kg-m, 2 Ib-ft)

SHIFT CABLE

SILICONE GREASE
10 N.
m

(1.0 kg-m, 7 Ib-ft)

SHIFT LOCK
SOLENOID

E-CLIP

3 N .
m

(0.3 kg-m, 2 Ib-ft)

DETENT COVER
DETENT
PLATE

10 N
.
m (1.0 kg-m, 7 Ib-ft)

BRACKET BEAM

SHIFT CABLE HOLDER

Install in this direction.

CONTROL

LEVER PIN

LOCK PIN

SELECTOR MOUNT

BRACKET

SILICONE
GREASEProCarManuals.com

INDEX MARK
SHIFT INDICATOR

PANEL

SRS MAIN

HARNESS
1. Check that the index mark of the indicator aligns with
the N mark of the shift indicator panel with the trans-mission in NEUTRAL.
2. If not aligned, remove the cellnter console panel (see section 20).
3. Remove the shift indicator panel mounting screws and adjust by moving the panel.
NOTE: Whenever the shift indicator panel is re-
moved, reinstall the panel as described above.
All SRS wiring harnesses are covered with yellow
outer insulation.
Before disconnecting any part of the SRS wire
harness, install the short connectors (see page
23-328).

Replace the entire affected SRS harness assembly if
it has an open circuit or damaged wiring.
CAUTION:

Adjustment

Shift Indicator PanelProCarManuals.com

Special Tools

Ref.
No.

Tool Number

07GAF-SD40700

07MAC-SL00200

07MAG-SL00100

07MAJ-SLOOOOA

07MAZ-SL00100

07MAZ-SL00200

07MAZ-SL00300

07MAZ-SL00400

07908-ME90000

07916-SA50001

07973-6920001

07974-SD90000
Description

Hub Dis/Assembly Base Ball Joint Remover, 28 mm

Ball Joint Boot Clip Guide
EPS Test Set
Test Harness A
Test Harness B
Test Harness C Power Unit Checker
Locknut Wrench
Locknut Wrench, 40 mm
P/S Adjustment Guide

Steering Inspection Arm
Qty

2
1

1

1

1
1
1

1

1
1

1
Page Reference

17-24 17-19, 64

17-30, 72

1
7-45,
48, 50,

52, 53, 54, 55,

56, 59, 60, 61

17-45, 53, 55

17-45, 56
17-45, 58
17-23, 26, 27 17-7,
70

17-25

17-22, 26, 69ProCarManuals.com

System Description

Steering Column

The NSX has a tilt/telescopic steering column. The tilt/telescopic mechanism makes it possible to adjust the steering

wheel in fore and aft, and up and down directions.

Tilt Mechanism

There is a joint on the upper steering shaft, and the portion of the column between the steering wheel and this joint

is
adjustable
up and
down. When
the
tilt
lever
is
operated,
the
lock
gears
are
detached from
the
column
gear
to
release

the
lock.
The
column
moves
upward
or
downward
on two
pivot bolts. When
the
tilt
lever
is
returned
to a
fixed position

after selecting the steering wheel height, the lock gear is engaged with the column gear to secure the column.

PIVOT

BOLT
TILT LEVER

COLUMN

GEAR
PIVOT

BOLT

LOCK GEAR
TILT LEVER

(cont'd)
JOINTProCarManuals.com

System Description

Steering Column (cont'd)

Telescopic Mechanism

The upper steering shaft is divided into two shafts, connected by splines, making it possible for the shaft to telescope

while transmitting the rotation of the steering wheel. When the telescopic lever is lowered, the lever pivot turns in a

direction to loosen the stopper shim at the tip of the lever pivot, allowing the shaft to make telescope. The telescopic

stroke is limited by the slot and stopper on the movable shaft. After selecting a steering wheel position and returning

the telescopic lever to the fastening position, the stopper shim is pressed against the movable shaft the lever pivot to

fasten the sliding part.

STOPPER

SHIM

STOPPER

UPPER

STEERING SHAFT

SPLINES

LEVER

PIVOT

TELESCOPIC LEVERProCarManuals.com

Energy-absorbing Steering Column/Wheel

Both the steering column and steering wheel are designed to absorb impact energy during a collision.

Steering Wheel

The steering wheel absorbs the energy of a collision through the deformation of the spoke portion. Should the impact

absorbing capacity of the column side decrease due to the deformation of the vehicle body during a collision, the steering

wheel will help absorb the impact.

Steering Column

The steering column is fastened on the body through a U-shaped plate, and the lower part of the column is inserted into

a lower holder. Due to this construction, the steering column will slide in its axial direction when a large impact is given

in the axial direction of the column. Since the U-shaped plate is fastened to the body, the U-shaped plate is bent and

deformed along the guide when the column slides in its axial direction. Through the deformation of the plate, the energy

is absorbed and the column slides forward. When exposed to a greater impact, a shear pin will break and the energy

is absorbed by the lower shaft.

< UNDER NORMAL CONDITION >

U-PLATE

< AT TIME OF IMPACT >
U-PLATE

GUIDE

The U-plates absorb an energy

while they are straightened by

the upper bracket.

< UNDER NORMAL CONDITION >

SHEAR PINS

< AT TIME OF IMPACT >

STEERING JOINT
< UNDER NORMAL CONDITION >

SPOKE

< AT TIME OF IMPACT >ProCarManuals.com

Inspection

Steering Wheel Rotational Play
1. Place the front wheels in a straight ahead position and measure the distance the steering wheel can be
turned without moving the front wheels.

2. If the
play
exceeds
the
service
limit,
check
all
steer- ing components.
Service Limit: 5 mm (0.2 in) maximum
Steering Effort Check (Manual Steering Only)
Operation Standard

Turn the steering wheel with a spring scale. Read the
measurement when the front wheels or steering wheel
start to move.Power Assist Check With Car
Parked (Electrical Power Steering

Only)

1. Raise the front wheels off the ground (see sec-
tion 1).

2. Turn the steering wheel with a spring scale and check its reading.
3. If the reading exceeds the service limit, adjust the steering gearbox as shown on the next page.
Service Limit: 20 N (2 kg, 4 Ibs) maximum Condition
Without power assist (engine off)
With power assist (engine running) Stationary Swing
operation load

120 N (12 kg, 26
Ibs)
maximum

42 N
(4.2
kg, 9.3
Ibs) maximumProCarManuals.com

Steering Gearbox Adjustment

Serious burns may result if you touch any
cooling components when the cooling system is hot.
Manual Steering:
1. Loosen the rack guide screw locknut.
2. Tighten, loosen and retighten the rack guide screw
two times to 5 N .
m (0.5 kg-m, 3.6 Ib-ft), then back

it off
15°.
RACK GUIDE SCREW
3. Tighten the locknut on the rack guide screw.
4. Check for tight or loose steering through the com- plete turning travel.
5. Recheck steering effort.
RACK GUIDE SCREW
LOCKNUT
68 N ·
m (6.8 kg-m, 49 Ib-ft)
CROW FOOT LOCKNUT
Electrical Power Steering:
1. Loosen the rack guide screw locknut.
2. Tighten, loosen and retighten the rack guide screw two times to 4 N·m (0.4 kg-m, 2.9 Ib-ft), then back
LOCKNUT
RACK GUIDE SCREW
3. Tighten the locknut on the rack guide screw with the special tool.
4. Check for tight or loose steering through the com- plete turning travel.
5. Recheck steering assist.
LOCKNUT
25 N .
m (2.5 kg-m, 18 Ib-ft) RACK GUIDE SCREW
LOCKNUT WRENCH. 40 mm

07916-SA50001
it off 20

WRENCH,ProCarManuals.com

Steering Wheel

Removal

Airbag Removal

Store a removed airbag assembly with the

pad surface up, if the airbag is improperly stored face

down, accidental deployment could propel the unit with

enough force to cause serios injury.

NOTE: Before removing the steering wheel, make sure

the front wheels are straight ahead.

CAUTION:
All SRS wiring harnesses are covered with yellow
outer insulation.

Before disconnecting any part of the SRS wire

harness, install the short connectors (see pages
23-328 and 329).

Replace the entire affected SRS harness assembly if
it has an open circuit or damaged wiring.
1. Disconnect both the negative cable and positive ca-
ble from the battery.

2. Remove the access panel from the steering wheel lower cover, then remove the short connector.
3. Disconnect the connector between the airbag and cable reel.
4. Connect the short connector to the airbag side of the connector.
AIRBAG 3-PCONNECTOR
SHORT CONNECTOR
(RED)

CABLE REEL 3-P
CONNECTOR

ACCESS PANEL
CRUISE CONTROL SET/RESUME

SWITCH

TORX ®
BOLT
AIRBAG ASSEMBLY (cont'd)

5. Remove the TORX
®
bolts using a TORX ®
T30 bit,

then remove the airbag assembly.
TORX ®
BOLTSProCarManuals.com