ACURA TL 1995 Service Repair Manual

Description
Regulator Valv e — '9 6 Mode l
Th e regulato r valv e maintain s a constan t hydrauli c pressur e fro m th e AT F pum p t o th e hydrauli c contro l system , whil e
als o furnishin g flui d t o th e lubricatin g syste m an d torqu e converter .
The flui d fro m th e AT F pum p flow s throug h B an d B'. Th e regulato r valv e ha s a valv e orifice . Th e flui d enterin g fro m B
flow s throug h th e orific e to th e A cavity . Thi s pressur e o f th e A cavit y pushe s th e regulato r valv e to th e righ t side , and thi s
movemen t o f th e regulato r valv e uncover s th e flui d por t t o th e torqu e converte r an d th e relie f valve . Th e flui d flow s ou t t o
th e torqu e converter , an d th e relie f valv e an d regulato r valv e move s to th e lef t side .
Accordin g to th e leve l o f th e hydrauli c pressur e throug h B , th e positio n o f th e regulato r valv e change s an d th e amoun t o f
th e flui d fro m B' throug h D an d C als o changes . Thi s operatio n is continued , maintainin g th e lin e pressure .
NOTE : Whe n used , "left " o r "right " indicate s directio n o n th e illustratio n below .
(ENGIN E NO T RUNNING )
.STATORSHAFTARM
Fro m OI L PUM P
REGULATO RVALVETo RELIE F VALV E
Regulato r Valv e — '9 7 - '98 Model s
Th e regulato r valv e regulate s lin e pressure , an d als o supplie s flui d to th e lubricatin g syste m an d torqu e converter . T o reg -
ulat e lin e pressure ,
the regulato r valv e passe s flui d fro m th e AT F pum p thoroug h th e lubricatin g syste m an d th e torqu e
converter . Th e regulato r Valv e receive s lin e pressur e contro l pressure .
Flui d fro m th e AT F pum p flow s throug h B an d
B'. Flui d enterin g fro m B flow s throug h th e regulato r valv e orific e t o th e A
cavity . Thi s pressur e o f th e A Cavit y pushe s th e regulato r valv e t o th e righ t side . Th e lin e pressur e contro l pressur e flow s
t o th e righ t sid e o f th e regulato r valve , an d pushe s th e regulato r valv e to th e lef t side . A s a result , th e regulato r valv e stay s
a t a certai n positio n to regulat e lin e pressure . Th e lin e pressur e contro l pressur e increase s accordin g t o th e throttl e open -
in g (throttl e B pressure) , whil e lin e pressur e increase s
accordin g to lin e pressur e contro l pressure .
NOTE : Whe n used , "left " o r "right " indicate s directio n o n th e illustratio n below .
ENGINE NO T RUNNIN G
REGULATO R VAVL E ORIFIC E ENGIN
E RUNNIN G
T o Torqu e Converte r LIN E PRESSUR E CONTRO L PRESSUR E
A CAVIT Y
REGULATO R VAVL ETo Lubricatin g Syste m LIN
E PRESSUR E fro m AT F PUM P
Hydrauli c Contro l (cont'd )
(ENGINE RUNNING )
T o TORQU E CONVERTE R
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Stator Reactio n Hydrauli c Pressur e Contro l
Hydrauli c pressur e increas e fro m torqu e is performe d b y th e regulato r valv e usin g stato r torqu e reaction . Th e stato r shaf t
i s spline d wit h th e stato r i n th e torqu e converter , an d it s ar m en d contact s th e regulato r sprin g cap . Whe n th e vehicl e i s
acceleratin g o r climbin g (Torqu e Converte r Range) , stato r torqu e reactio n act s o n th e stato r shaft , an d th e stato r ar m
pushe s th e regulato r sprin g ca p in th e directio n o f th e arro w in proportio n t o th e reaction . Th e stato r reactio n sprin g com -
presses , an d th e regulato r valv e move s t o increas e th e lin e pressur e whic h i s regulate d b y th e regulato r valve . Th e lin e
pressur e reache s it s maximu m whe n th e stato r torqu e reactio n reache s it s maximum .
TORQUE CONVERTE R
REGULATOR VALV E
REGULATO R VALV E
BOD Y
STATO R
(Inside torqu e converter )
REGULATOR
SPRING CAP
STATOR SHAFT ARM
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Description
Line Pressur e - Modulato r Pressur e
- Throttl e B Pressur e
- Clutc h Pressur e
Distributio n o f Hydrauli c Pressur e
Regulato r Valv e Torque Converte r Pressur e
Lubricatio n Pressur e
T o Regulat e Lin e Pressur e
Manua l Valv e
Modulato r Valv e
To Selec t Lin e Pressur e
Modulato r Pressur e Clutc
h Pressur e
Shif t Contro l Solenoi d Valve s
Lock-u p Contro l Solenoi d Valve s
1-2 Shif t Valv e
2-3 Shif t Valv e
3-4 Shif t Valv e
Throttl e Valv e
Clutc h Pressur e
Throttle B Pressur e
NO.
1
2
3
4
4'
4"
5
5 '
6
6A
6 B
6C
6D
DESCRIPTIO N O F PRESSUR E
LIN E
LIN E
LIN E
LIN E
LIN E
LIN E
LINE
LIN E
LIN E
MODULATO R
MODULATO R
MODULATO R
MODULAT E (DUT Y CONTROL )
NO.
7
10
10 '
11
2 0
2 5
30
4 0
5 0
5 5
56
57
7 0
DESCRIPTIO N O F PRESSUR E
LIN E
1S T CLUTC H
1S T CLUTC H
1S T CLUTC H
2N D CLUTC H
LIN E
3R D CLUTC H
4T H CLUTC H
REVERS E CLUTC H
THROTTL E B
THROTTL E B
THROTTL E B
1ST-HOL D CLUTC H
NO.
71
7 2
90
9 1
9 2
93
9 4
9 5
96
99
X
DESCRIPTIO N O F PRESSUR E
1ST-HOL D CLUTC H
1ST-HOL D CLUTC H
TORQU E CONVERTE R
TORQUE CONVERTE R
TORQUE CONVERTE R
ATF COOLE R
TORQUE CONVERTE R
LUBRICATIO N
TORQUE CONVERTE R
SUCTION
EXHAUS T
14-30
Hydrauli c Flo w — '96 Mode l
Genera l Char t o f Hydrauli c Pressur e
ATF Pum pRegulato r Valv e
Torque Converte r Pressur e
Lubricatio n Pressur e
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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
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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

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
2. 2nd Gear

As the speed of the vehicle reaches the prescribed value, shift control solenoid valve A is turned ON by means of the

PCM. Shift control solenoid valve B remains ON. Modulator pressure (6A) in the left end of the 1-2 shift valve is

released by turning shift control solenoid valve A ON. The 1-2 shift valve is moved to the left side and uncovers the

port to allow line pressure (5) to the 2nd clutch. Line pressure (5) becomes 2nd clutch pressure (20) at the orifice. 2nd

clutch pressure (20) is applied to the 2nd clutch, and the 2nd clutch is engaged.

Fluid flows by way of;

Hydraulic pressure also flows to the 1st clutch. However, no power is transmitted because of the one-way clutch.
Orifice - 2nd Clutch
1-2 Shift Valve - Line Pressure (5)
CPC Valve - Line Pressure (4')
- Line Pressure (4)

Pressure (20)

2nd ClutchProCarManuals.com

Description

or
Position
Hydraulic Flow — '96 Model (cont'd)

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
3. 3rd Gear

As the speed of the vehicle reaches the prescribed value, shift control solenoid valve B is turned OFF by the PCM. Shift

control solenoid valve A remains ON. Modulator pressure (6B) flows to the right ends of the 1-2 shift valve and the 2-3

shift valve. The 2-3 shift valve is moved to the left side by modulator pressure (6B). The 2-3 shift valve uncovers the

port to allow line pressure (5) to the 3-4 shift valve as this valve is moved to the left side. Line pressure (5') becomes

the 3rd clutch pressure. The 3rd clutch pressure (30) is applied to the 3rd clutch, and the 3rd clutch is engaged.

Fluid flows by way of:

- Line Pressure (4)

Hydraulic pressure also flows to the 1st clutch and 2nd clutch. However, no power is transmitted because of the one-

way clutches.
2-3 Shift Valve - Line

1-2 Shift Valve - Line Pressure (5)

3rd Clutch

3-4 Shift Valve - 3rd Clutch Pressure (30)
CPC Valve - Line Pressure (4')

Pressure (5')ProCarManuals.com

Position

4. 4th Gear

As the speed of the vehicle reaches the prescribed value, shift control solenoid valve A is turned OFF by the PCM. Shift

control solenoid valve B remains OFF. Modulator pressure (6A) flows to the right end of the 3-4 shift valve and the left

end of the 1-2 shift valve. Modulator pressure (6A) in the left end of the 1-2 shift valve equals modulator pressure (6B)

in the right end of the 1-2 shift valve, so the 1-2 shift valve remains in the left side by valve spring tension.

The 3-4 shift valve is moved to the left side by modulator pressure (6B). The 3-4 shift valve covers the port leading to

the 3rd clutch and uncovers to the 4th clutch as this valve is moved to the left side. Line pressure (5') from the 2-3 shift

valve becomes 4th clutch pressure (40). The 4th clutch pressure (40) is applied to the 4th clutch, and the 4th clutch is

engaged.

Fluid flows by way of:

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
Hydraulic pressure also flows to the 1st clutch and 2nd clutch. However, no power is transmitted because of the one-

way clutches.
- Line Pressure (4)

Pressure (5')
CPC valve - Line Pressure (4')
1-2 Shift Valve - Line Pressure (5)
2-3 Shift valve - Line

3-4 Shift Valve - 4th Clutch Pressure (40)
4th ClutchProCarManuals.com