1995 ACURA TL clutch

Position, 4th gear

1. The hydraulic pressure is applied to the 4th clutch, which rotates together with the mainshaft, and the mainshaft 4th

gear rotates.

2. Power is transmitted to the countershaft 4th gear, which drives the countershaft.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: In

position, 4th gear, hydraulic pressure is also applied to the 1st clutch and to the 2nd clutch, but since the

rotation speed of 4th gear exceeds that of 2nd gear, power from 2nd gear is cut off at the 2nd gear one-way clutch.

MAINSHAFT

2ND GEAR

2ND CLUTCH

MAINSHAFT
TORQUE CONVERTER

MAINSHAFT

4TH GEAR

1ST CLUTCH
4TH CLUTCH

COUNTERSHAFT

4TH GEAR

COUNTERSHAFT

2ND GEAR
2ND GEAR

ONE-WAY CLUTCH
COUNTERSHAFT
SECONDARY

DRIVE GEAR

SECONDARY DRIVEN GEAR

(cont'd)ProCarManuals.com

Description

Power Flow (cont'd)

Position

1. The hydraulic pressure is applied to the reverse clutch. Power is transmitted from the mainshaft reverse gear via the

reverse idler gear to the countershaft reverse gear.

2. The rotation direction of the countershaft reverse gear is changed via the reverse idler gear in the rear cover.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

REVERSE IDLER

GEAR

TORQUE CONVERTER
MAINSHAFT REVERSE

GEAR

COUNTERSHAFT

REVERSE GEAR

MAINSHAFT

REVERSE GEAR

REVERSE

IDLER GEAR

MAINSHAFT

COUNTERSHAFT

COUNTERSHAFT

REVERSE GEAR

REVERSE CLUTCH

SECONDARY DRIVEN GEAR
SECONDARY

DRIVE GEARProCarManuals.com

Description

The hydraulic control system is controlled by the ATF pump, valves, and accumulators in the valve bodies. The ATF pump

is driven by splines on the end of the torque converter which is attached to the engine.

Fluid from the ATF pump flows through the regulator valve to maintain specified pressure through the main valve body to

the manual valve, directing pressure to each of the clutches.

The valve body includes the main valve body, the secondary valve body, the ATF pump body, the regulator valve body,

the throttle valve body, and the accumulator body. The throttle valve body is joined with the linear solenoid.

The shift control solenoid valves A and B are bolted to the secondary valve body. The lock-up control solenoid valve assem-

bly is bolted to the outside of the torque converter housing.

ATF PUMP BODY

ACCUMULATOR BODY

SHIFT CONTROL

SOLENOID VALVE

A/B

REAR COVER

REGULATOR VALVE

BODY

THROTTLE VALVE BODY

SECONDARY VALVE BODY

MAIN VALVE BODY

ATF PASSAGE

NOTE: The illustration shows '96 model; '97 - '98 models are similar.
Hydraulic ControlProCarManuals.com

Hydraulic Control/Lower Valve Body Assembly — '96 Model

The lower valve body assembly is located on the bottom of the transmission housing. The lower valve body assembly

consists of the main valve body, the secondary valve body, and the ATF passage.

Main Valve Body

The main valve body houses the manual valve, the 1-2 shift valve, the 2-3 shift valve, the 3-4 shift valve, the 4-3 kick-down

valve, and the Clutch Pressure Control (CPC) valve.

The primary functions of the main valve body are to switch fluid pressure on and off, and to control the hydraulic pressure

going to the hydraulic control system.

Secondary Valve Body

The secondary valve body is located on the main valve body. The secondary valve body houses the modulator valve, the

3-4 orifice control valve, the 4-3 shift timing valve, the 1st accumulator piston, and the 2nd accumulator piston. The shift

control solenoid valves A and B are bolted to the secondary valve body.

Throttle Valve Body/Linear Solenoid

The throttle valve body is joined with the linear solenoid, which is controlled by the PCM. The throttle valve body/linear

solenoid assembly is located on the secondary valve body. The throttle valve body houses the throttle valve.

SHIFT CONTROL

SOLENOID VALVE B

SHIFT CONTROL

SOLENOID VALVE A

MODULATOR VALVE

1ST ACCUMULATOR

PISTON

SECONDARY VALVE

BODY

MAIN VALVE BODY

MANUALVALVE

CPC VALVE
LINEAR SOLENOID

THROTTLE VALVE BODY

THROTTLE VALVE

2ND ACCUMULATOR

PISTON

3-4 ORIFICE CONTROL

VALVE

4-3

SHIFT TIMING VALVE

4-3 KICK-DOWN

VALVE

3-4 SHIFT VALVE

2-3 SHIR VALVE

1-2 SHIFT VALVE

(cont'd)ProCarManuals.com

Position

(cont'd)
As the engine turns, the ATF pump also starts to operate. Automatic transmission fluid (ATF) is drawn from (99) and dis-

charged into (1). Then, ATF flowing from the ATF pump becomes the line pressure (1). The line pressure (1) is regulated

by the regulator valve. The torque converter inlet pressure (92) enters (94) of the torque converter through the lock-up

shift valve and discharges into (90).

The torque converter check valve prevents the torque converter pressure from rising.

Under this condition, the hydraulic pressure is not applied to the clutches as the manual valve stops line pressure (1).

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.ProCarManuals.com

Description
Hydraulic Flo w — '9 6 Mode l (cont'd )
Position
Lin e pressur e (1 ) flow s t o th e manua l valve , th e modulato r valve , an d th e throttl e valve . Lin e pressur e (1 ) become s modu -
lato r pressur e (6 ) a t th e modulato r valve , an d lin e pressur e (4 ) an d
(4') , and 1st-hol d clutc h pressur e (70 ) a t th e manua l
valve .
Modulato r pressur e (6 ) flow s t o th e lef t en d o f th e 1- 2 shif t valv e an d t o th e righ t en d o f th e 3- 4 shif t valv e becaus e shif t
contro l solenoi d valv e A is turne d OF F an d B is turne d O N b y th e PCM , 1- 2 shif t valv e i s move d t o th e righ t side , an d 3- 4
shif t valv e i s move d t o th e lef t side . Th e 1st-hol d clutc h pressur e (70 ) become s lin e pressur e (7 ) a t th e manua l valve , the n
goe s t o th e 2- 3 shif t valve . Th e 2- 3 shif t valv e remain s i n th e righ t side .
Lin e pressur e (4 ) become s 1s t clutc h pressur e (11) . Th e 1s t clutc h pressur e (11 ) i s applie d t o th e 1s t clutch , an d th e 1s t
clutc h i s engaged .
Flui d flow s b y wa y of :
Lin e pressur e (1 ) als o become s 1st-hol d clutc h pressur e (70) , an d it flow s t o th e 1st-hol d clutc h an d th e 1st-hol d accumula -
to r vi a th e 2- 3 shif t valve .
Powe r i s transmitte d onl y durin g deceleratio n throug h th e 1st-hol d clutch .
NOTE : Whe n used , "left " o r "right " indicate s directio n o n th e hydrauli c circuit .
-
Lin e Pressur e (4 )
CPC Valv e - Lin e Pressur e
(4')
Manua l Valv e - 1s t Clutc h Pressur e (10 )
Pressur e
(11) 1s t Clutc h
Orifice - 1st Clutc h Pressur e (11 )
1-
2 Shif t Valv e - 1s t Clutc h Pressur e
(10')
1-2 Shif t Valve-1s t Clutch
ProCarManuals.com

Position

Line pressure (1) flows to the manual valve, the modulator valve, and the throttle valve. Line pressure (1) becomes modu-

lator pressure (6) at the modulator valve, and line pressure (4) and (4'), and 1st-hold clutch pressure (70) at the manual

valve.

Modulator pressure (6) does not flow to each shift valve because shift control solenoid valves A and B are turned ON by

the
PCM.

Line pressure (4) becomes line pressure (4') at the CPC valve, and line pressure (4') becomes line pressure (5) at the 1-2

shift valve. The line pressure (5) changes into the 2nd clutch pressure (20) at the orifice. The 2nd clutch pressure (20) is

applied to the 2nd clutch, and the 2nd clutch is engaged.

Line pressure (4) also become 1st-hold clutch pressure (70). Ist-hold clutch pressure (70) is applied to the 1st-hold clutch

via the 2-3 shift valve.

Power is transmitted only during deceleration through the 1st-hold clutch.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.ProCarManuals.com

Description

Hydraulic Flow — '96 Model (cont'd)

or
Position

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
1. 1st Gear

Line pressure (1) flows to the manual valve, the modulator valve, and the throttle valve. Line pressure (1) becomes

modulator pressure (6) at the modulator valve, and line pressure (4) at the manual valve.

Modulator pressure (6) flows to the left end of the 1-2 shift valve and right end of the 3-4 shift valve because shift con-

trol solenoid valve A is turned OFF and B is turned ON by the PCM, 1-2 shift valve is moved to the right side, and the 3-

4 shift valve is moved to the left side.

Line pressure (1) also becomes 1st clutch pressure (10). The 1st clutch pressure (10) is applied to the 1st clutch and 1st

accumulator, causing the vehicle to move as engine power is transmitted.

valve covers the port to leading to the 1st-hold clutch.
position.

The flow of fluid through the torque converter circuit is the same as in

In

or
position at 1st speed, the 1st-hold clutch pressure is not applied to the 1st-hold clutch because the manualProCarManuals.com