1991 ACURA NSX Service Repair Manual

Test Harness Installation
Test Harness A

EPS CONTROL UNIT
TEST HARNESS A

07MAZ-SL00100

Test Harness B

TEST HARNESS B

07MAZ-SL00200

STEERING GEARBOX
Test Harness C

POWER UNIT
TEST HARNESS C
07MAZ-SL00300

Power Unit Checker

Connect to the

cigarette lighter
POWER UNIT CHECKER

07MAZ-SL00400

POWER UNIT
OUTPUT
(VIS)

Remove the glove box and disconnect the EPS con-

trol unit connector.

Connect test harness A.
Disconnect the torque sensor and steering speed sen-
sor connectors and connect test harness B. Pull the floor carpet back from the passenger's side
and remove the bass speaker and power unit cover.
Disconnect the connector and connect test harness C.
Pull the floor carpet back from the passenger's side
and remove the bass speaker and power unit cover. Disconnect the connector and connect the power unit
checker.
Remove the cigarette lighter and connect the power

unit checker.ProCarManuals.com

Troubleshooting Chart
The EPS has been reported on: Connect the service check connector with a jumper wire (see page 17-43). Turn on the ignition switch.Read the Diagnostic Trouble Code (DTC) and perform the troubleshooting according to the troubleshooting chart below.

17-52

17-54

17-56

17-59

17-60

17-62ProCarManuals.com

Component Location

Index

NOTE:

EPS CONTROL UNITReplacement, page 17-74
POWER UNIT
Replacement, page 17-73
STEERING WHEEL/
AIRBAG ASSEMBLYRemoval, page 17-8
Disassembly, page 17-9

Installation, page 17-10

STEERING COLUMN
Removal, page 17-12

Inspection, page 17-14

Installation, page 17-15

STEERING GEARBOX Removal/Installation, page 17-64

Illustrated Index, page 17-68

Pinion Preload Inspection, page 17-69

Rack Guide Screw Adjustment, page 17-69
If an intact airbag assembly has been removed from a scrapped car or has been found defective or damaged during
transit, storage or service, it should be deployed (see section 23).
Before removing the gearbox, remove the ignition key to lock the steering shaft.
After installing the gearbox, check the wheel alignment and adjust if necessary.ProCarManuals.com

Power Steering
Gearbox Removal/Installation

NOTE: Before removing the steering gearbox, make

sure the front wheels are straight ahead.
1. Remove the steering joint cover.

STEERING JOINT COVER

CLAMP

CLIP

2. Remove the steering joint bolts, and disconnect the steering joint by moving the joint toward the

STEERING JOINT

column.

STEERING JOINT BOLTS

22 N.
m (2.2 kg-m, 16 Ib-ft)

3. Lock the steering shaft with ignition key to keep the steering shaft position.

4. Raise the car and place safety stands in the proper
locations (see secion 1).
5. Remove the front wheels.
6. Remove the cotter pin from the castel nut and remove the nut. 7. Install the 10 mm hex nut on the ball joint. Be sure
that the 10 mm hex nut is flush with the ball joint
pin end, or the threaded section of the ball joint pin
might be damaged by the ball joint remover.
NOTE: Remove the ball joint using the Ball Joint
Remover, 28 mm (07MAC —SL00200). Refer to
page 18-21 for how to use the ball joint remover.
8. Separate the tie-rod ball joint and knuckle using the special tool.
CAUTION: Avoid damaging the ball joint boot.
NOTE: If necessary, apply penetrating type lubricant

to loosen the ball joint.

BALL JOINT REMOVER, 28 mm

07MAC-SL00200

CASTLE NUT

44 N .
m (4.4 kg-m, 32 Ib-ft)

COTTER PIN

Replace.
10 mm HEX NUT

Corrosion resistant bolt/nut

9. Remove the folding spare tire and spare tire holder plate.
10. Disconnect the battery negative terminal, then disconnect the positive terminal and remove the
battery.
11. Remove the spare tire holder and floor under cover.
10 N·m

SPARE TIRE

HOLDER

FLOOR UNDER

COVER

8 x
1.25
mm

BOLT

WASHERS

25 N .
m

(2.5 kg-m, 18 Ib-ft)

Corrosion resistant bolt/nut

TOOTHED LOCK

WASHERS

(1.0 kg-m, 7 Ib-ft)ProCarManuals.com

12. Disconnect the connectors from the EPS wire
harness.
13. Remove the ground cable by removing the EPS wire harness stay.
EPS WIREHARNESS STAY EPS WIRE HARNESS
GROUND

CABLE
FLANGE BOLT
10 N .
m (1.0 kg-m, 7 Ib-ft)
14. Remove the terminal guard and ground cable.
15. Remove the terminal nuts and the wires from the gearbox terminals.
TERMINAL NUTS10 N .
m
(1.0 kg-m, 7 Ib-ft)
GROUND CABLE

NOTE: After tight-

ening the terminal
nuts, bend up the

terminal tabs
against the nuts

securely.

FLANGE BOLT 10 N .
m (1.0 kg-m, 7 Ib-ft)
TERMINAL GUARD
Corrosion resistant bolt
FLANGE BOLT
10 N ·
m (1.0 kg-m, 7 Ib-ft) 16. Remove the radiator pipe bracket at the front com-
partment bulkhead.
RADIATOR PIPE BRACKET
RADIATOR PIPE
17. Remove the radiator pipe bracket at the floor, and space the radiator pipe away from and gearbox.
RADIATOR PIPE
RADIATOR PIPE

BRACKET

(cont'd)ProCarManuals.com

Power SteeringGearbox Removal/Installation (cont'd)

NOTE: Before removing the gearbox, place a stand
jack under the gearbox and front crossbeam to lightly

support them. Lower the gearbox together with the

front crossbeam.
18. Remove the flange bolts and nuts of the gearbox and front crossbeam.
FLANGE NUTS
60 N.m (6.0 kg-m, 43 Ib-ft)
10 x 97 mm

FLANGE BOLT (Crossbeam bracket
to Front crossbeam)

10 x 97 mm

FLANGE BOLT (Crossbeam bracket
to Front crossbeam)
FLANGE NUT

60N .
m

(6.0 kg-m,
43 Ib-ft)
10 x 97 mm

FLANGE BOLT
(Crossbeam bracket
to Front crossbeam)

LEFT SIDE:

RIGHT SIDE:
10 x 84 mm

FLANGE BOLT

60N .
m

(6.0 kg-m, 43 Ib-ft) (Gearbox to Front
crossbeam)
Corrosion resistant bolt/nut
10 x 68 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
(Front crossbeam
to crossbeam bracket)
10 x 68 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
(Front crossbeam to
crossbeam bracket)
10 x 97 mm

FLANGE BOLT

60N·m

(6.0 kg-m, 43 Ib-ft) (Gearbox to Front
crossbeam) 19. Lower the gearbox and front crossbeam with care

so as not to interfere with the radiator pipe.

NOTE: The crossbeam is attached to the cross-
beam bracket with knock pins. Remove the cross-
beam by lightly taping on it with a plastic hammer,

then remove the gearbox.
LEFT CROSSBEAM BRACKET
FRONT CROSSBEAM
GEARBOX

ASSEMBLY

20. When installing the crossbeam to the crossbeam bracket, be sure to align the holes in the crossbeam

with the knock pins on the crossbeam bracket.

CROSSBEAM

BRACKET

KNOCK PIN
FRONT CROSSBEAM RIGHT CROSSBEAM

BRACKET

STEERING

GEARBOX
BRACKET

CUSHION B
MOUNT BASE
FLANGE NUT

60N
·
m

(6.0 kg-m, 43 Ib-ft)ProCarManuals.com

21. Install the gearbox in the reverse order of removal.
NOTE: When connecting the steering joint, make
sure that the cable reel of airbag system is
centered.
22. Set the steering rack in the center of its stroke.
23. Center the cable reel as follows: Turn the steering wheel left approx. 150 degrees,
to check the cable reel position with indicator. If the cable reel is centered, the yellow gear tooth
lines up with the alignment mark on the cover.
Return the steering wheel right approx. 150
degrees to position the steering wheel in the
straight ahead position.
YELLOW GEAR TOOTH
ALIGNMENT MARK
24. Slip the lower of the steering joint onto the pinion shaft (line up the bolt hole with the groove around
the shaft) and loosely install the lower bolt.

NOTE:
Be sure that the lower steering joint bolt is
securely in the groove in the steering gearbox
pinion.

If the steering wheel and rack are not aligned
centered, reposition the serrations at lower side
of the steering joint.
25. Adjust the front toe after install the gearbox (see section 18).ProCarManuals.com

Power Steering

Illustrated Index

CAUTION: Do not try to disassemble the power steering gearbox. If the gearbox is faulty, replace it as an assembly.
Corrosion resistant bolt/nut
GEARBOX ASSEMBLY
MOUNT BASE
10 mm FLANGE NUT

60 N ·
m

(6.0 kg-m, 43 Ib-ft)
FLANGE BOLT
10 N.m

(1.0 kg-m, 7 Ib-ft)
GROUND CABLE

STOP WASHER
LOCK WASHERReplace.
RACK END
55 N ·
m (5.5 kg-m, 40 Ib-ft)
BOOT

Check for damage.

STEERING GREASE
(Honda P/N 08733-B070E)

Coat the inside of the boot.

SILICONE GREASE
Coat the sliding surface

of the rack end. TIE-ROD
LOCKNUT44N·m
(4.4 kg-m, 32 Ib-ft)
TIE-ROD END BOOT
Replace.
SET RING
TUBE CLAMP COTTER PIN
Replace.
CASTLE NUT

44 N·m

(4.4 kg-m, 32 Ib-ft)
FLANGE BOLT

10 N ·
m

(1.0 kg-m, 7 Ib-ft) TERMINAL
GUARDFLANGE BOLT

10 N.m

(1.0 kg-m, 7 Ib-ft)
10 x 97 mm

FLANGE BOLT

60N .
m

(6.0 kg-m, 43 Ib-ft)
STEERING GROMMET

Check for damage.

CUSHION B

Check for damage.
STEERING
GEARBOX BRACKET
10 x 97 mm

FLANGE BOLT
10 x 84 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
WIRE HARNESS STAY 10 mm FLANGE NUT

60 N·m

(6.0 kg-m, 43 Ib-ft)

MOUNT COLLER
MOUNT BUSHING

Check for damage.

BOOT BAND
Replace.ProCarManuals.com