1997 ACURA NSX tire pressure

Wheel Alignment
Height
NSX/NSX- T fou r whee l alignmen t require s th e us e o f equipmen t designe d specificall y fo r fou r whee l independen t
suspension s an d capabl e o f immediat e feedback .
NOTE : Fo r prope r inspection/adjustmen t o f th e whee l alignment , chec k an d adjus t th e followin g befor e checkin g
th e alignment .
• Chec k tha t th e suspensio n i s no t modified .
• Chec k th e tir e siz e an d tir e pressure .
• Chec k th e runou t o f th e wheel s an d tires .
• Chec k th e suspensio n bal l joints . (Hol d a whee l wit h you r hands , the n mov e th e whee l u p an d dow n an d righ t
an d lef t t o chec k fo r wobbling. )
• Chec k th e heigh t o f eac h suspensio n (se e below) .
Heigh t inspection :
• Befor e checkin g fo r th e height , bounc e th e vehicl e u p an d dow n severa l time s befor e measuring .
• Chec k th e heigh t wit h th e vehicl e empty , parke d o n a leve l surface , wit h properl y inflate d tire s (trea d wea r indicator s
mus t no t b e showing) . I f th e heigh t i s ou t o f specification , loa d o r unloa d th e vehicl e a s necessary .
Front
: Rear :
Groun d clearanc e t o th e cente r o f th e lowe r Groun d clearanc e t o th e cente r o f toe con -
contro l ar m bol t tro l ar m bol t
ProCarManuals.com

Description

The automatic transmission is a combination of a 3-element torque converter and a triple-shaft electronically controlled

automatic transmission which provides 4 speeds forward and 1 speed reverse. The entire unit is positioned in line with the

engine.

Torque Converter, Gears, and Clutches

The torque converter consists of a pump, turbine, and stator, assembled in a single unit.

They are connected to the engine crankshaft so they turn together as a unit as the engine turns.

Around the outside of the torque converter is a ring gear which meshes with the starter pinion when the engine is being

started. The entire torque converter assembly serves as a flywheel while transmitting power to the transmission main-

shaft. The transmission has three parallel shafts: the mainshaft, the countershaft, and the secondary shaft. The mainshaft

is in line with the engine crankshaft.

The mainshaft includes the 1st and 4th clutches, and gears for 3rd, 4th, reverse, and 1st (3rd gear is integral with the main-

shaft, while reverse gear is integral with 4th gear).

The countershaft includes the 1st-hold and 3rd clutches, and gears for 2nd, 3rd, 4th, reverse, 1st, and parking.

The secondary shaft includes the 2nd clutch and gears for 2nd and 3rd.

The 4th and reverse gears can be locked to the countershaft at its center, providing 4th gear or reverse, depending on

which way the selector is moved.

The gears on the mainshaft and secondary shaft are in constant mesh with those on the countershaft.

When certain combinations of gears in the transmission are engaged by clutches, power is transmitted from the mainshaft

to the countershaft to provide positions.

Electronic Control

The electronic control system consists of the Transmission Control Module (TCM), sensors, a linear solenoid, a shift switch,

and 4 solenoid valves. Shifting and lock-up are electronically controlled for comfortable driving under all conditions.

The TCM is located on the insulator center bulkhead, behind the driver's seat.

Hydraulic Control

The valve bodies include the main valve body, secondary valve body, servo body, regulator valve body, throttle valve

body, lock-up valve body, and the 2nd accumulator body.

They are bolted to the torque converter housing as an assembly.

The main valve body contains the manual valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, relief valve, one-way relief

valve, and oil pump gears.

The secondary valve body contains the 3-2 kick-down valve, clutch pressure control (CPC) valve, 2nd orifice control valve, 3rd

orifice control valve, modulator valve, 4th exhaust valve, servo control valve, 2nd exhaust valve, and 4-3 kick-down valve.

The servo body contains the accumulator pistons and servo valve. The throttle valve body includes the throttle valve B

which is bolted to the servo body.

The regulator valve body contains the pressure regulator valve, lock-up control valve, and cooler relief valve. Fluid from

the regulator passes through the manual valve to the various control valves.

The lock-up valve body contains the lock-up timing B valve and lock-up shift valve. The 2nd accumulator body contains

the accumulator pistons and limited slip differential relief valve.

The torque converter check valve is located in the torque converter housing, under the main valve body.

The 1st, 1st-hold, 3rd, and 4th clutches receive fluid from their respective feed pipes and the 2nd clutch receives fluid from

the internal hydraulic circuit.

Shift Control Mechanism

Input from various sensors located throughout the vehicle determines which shift control solenoid valve the TCM will acti-

vate. Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This pressurizes

a line to one of the clutches, engaging that clutch and its corresponding gear.

Lock-up Mechanism

In position and position in 2nd, 3rd, and 4th, pressurized fluid is drained from the back of the torque converter

through a fluid passage, causing the lock-up piston to be held against the torque converter cover. As this takes place, the

mainshaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the TCM optimizes the tim-

ing of the lock-up mechanism.

The lock-up valves control the range of lock-up according to lock-up control solenoid valves A and B, and throttle valve B.

When lock-up control solenoid valves A and B activate, modulator pressure changes. The lock-up control solenoid valves

A and B are mounted on the torque converter housing, and are controlled by the TCM.

(cont'd)ProCarManuals.com

Wheel Alignment

Height

NSX/NSX-T four wheel alignment requires the use of equipment designed specifically for four wheel independent

suspensions and capable of immediate feedback.

NOTE: For proper inspection/adjustment of the wheel alignment, check and adjust the following before checking

the alignment.

• Check that the suspension is not modified.

• Check the tire size and tire pressure.

• Check the runout of the wheels and tires.

• Check the suspension ball joints. (Hold a wheel with your hands, then move the wheel up and down and right

and left to check for wobbling.)

• Check the height of each suspension (see below).

Standard value

Front:

Ground clearance to the center of the lower

control arm bolt
Rear:

Ground clearance to the center of the toe con-

trol arm bolt

Height inspection:

• Before checking for the height, bounce the vehicle up and down several times before measuring.

• Check the height with the vehicle empty, parked on a level surface, with properly inflated tires (tread wear indicators

must not be showing). If the height is out of specification, load or unload the vehicle as necessary.ProCarManuals.com

Front Wheel Alignment Adjusting Procedure

Adjustment

NOTE: NSX/NSX-T four wheel alignment requires the use of equipment designed specifically for four wheel independent

suspensions and capable of immediate feedback.

The NSX/NSX-T suspension can be adjusted for camber, caster (front only), and toe. However, because each of them

relates to the other, the camber changes when the toe is adjusted for example. Therefore, the total adjustment of the

front/rear wheel alignment is required whenever one of the elements (camber, caster, or toe) is adjusted.

Front wheel alignment adjusting procedure

Measure and adjust both camber and toe of the

left side.

Measure and adjust both camber and toe of the

right side.

Adjust caster on both sides.

Measure and readjust both camber and toe of

the left side.

Measure and readjust both camber and toe of

the right side.
TOP VIEW:

CASTER

TOE
CAMBER
Check tire pressure on both sides.

Check the ride height on both sides.ProCarManuals.com

Rear Wheel Alignment Adjusting Procedure

Rear wheel alignment adjusting procedure

Check tire pressure on both sides.

Check the ride height on both sides.

Adjust both camber and toe of the left side.

Adjust both camber and toe of the right side.
TOP VIEW:

CAMBER

TOEProCarManuals.com

If brake inputs (force exerted on brake pedal) are excessively large and a possibility of wheel locking occurs, the control

unit operates the solenoid valve, closing the outlet valve and opening the inlet valve. As a result, the high pressure is

directed into chamber C, the piston is pushed upward, causing the slide piston to move upward and the cut-off valve to

close.

As the cut-off valve closes, the flow from the master cylinder to the caliper is interrupted, the volume of chamber B, which

is connected to the caliper, increases, and the fluid pressure in the caliper declines.

When both of the two valves, inlet and outlet, are closed (when only the outlet valve is activated) the pressure in the

caliper is maintained constant.

When the possibility of wheel locking ceases, it is necessary to restore the pressure in the caliper. The solenoid valve is

therefore turned off (outlet valve: open, inlet valve closed).

Slide Piston Function

When the vehicle is used on rough roads where the tires sometimes lose adhesion, the anti-lock brake system may func-

tion excessively, causing an excessively large volume of brake fluid to flow into the chamber C. As this occurs, the piston

is moved excessively, resulting in an abnormal loss of pressure in the chamber B. In order to overcome this problem, the

slide piston is kept in the proper position by the spring force to avoid a negative pressure in the chamber B.

Kickback

When anti-lock brake system is functioning, the piston moves upward, the volume of chamber B increases, and the fluid

pressure on the caliper side is reduced. At the same time, the volume of chamber A is reduced and the brake fluid is

returned to the master cylinder. When the brake fluid is pushed back to the master cylinder, the driver can feel the func-

tioning of the anti-lock brake system because the brake pedal is kicked back.ProCarManuals.com