1995 ACURA TL clutch

Half Lock-up

Lock-up Control Solenoid Valve A: ON Lock-up Control Solenoid Valve B: ON

Modulator pressure is released by the solenoid valve B, causing modulator pressure in the left side of the lock-up control

valve to lower.

Also, modulator pressure in the left cavity of the lock-up timing valve is low. However, throttle B pressure is still low at

this time, so the lock-up timing valve is kept on the right side by the spring force.

With the lock-up control solenoid valve B turned on, the lock-up control valve is moved somewhat to the left side, causing

back pressure (F2) to lower. This allows a greater amount of fluid (F1) to work on the lock-up clutch to engage it. Back

pressure (F2), which still exists, prevents the clutch from engaging fully.

NOTE:

When used, "left" or "right" indicates direction on the hydraulic circuit.

The hydraulic circuit shows '97 - '98 models; '96 model is similar.
Description

Lock-up System (cont'd)ProCarManuals.com

Full Lock-up

Lock-up Control Solenoid Valve A: ON Lock-up Control Solenoid Valve B: ON

When the vehicle speed further increases, throttle B pressure is increased in accordance with the throttle opening.

Throttle B pressure (55) flows to the right side of the lock-up timing valve and the lock-up control valve, and they are moved

to the left side. The lock-up timing valve covers the port leading the torque converter pressure (90) from the torque convert-

er to the lock-up control valve. The lock-up control valve uncovers the port to leak torque converter pressure (94) and (96).

As this takes place, the torque converter back pressure is released fully, causing the lock-up clutch to be engaged fully.

NOTE:

When used, "left" or "right" indicates direction on the hydraulic circuit.

The hydraulic circuit shows '97- '98 models; '96 model is similar.ProCarManuals.com

Symptom-to-Component Chart

Hydraulic System

SYMPTOM

Engine runs, but vehicle does not move in any gear.

Vehicle moves in , but not in , , or position.

Vehicle moves in , , but not in position.

Vehicle moves in , , but not in position.

Vehicle moves in but not in position.

Vehicle moves in position.

Excessive idle vibration

Poor

acceleration; flares on starting off in position

Stall rpm high in position

Stall rpm high in , , position

Stall rpm high in position

Stall rpm high in position

Stall rpm low

No shift

Fails to shift in position; from 1st to 3rd gear

Fails to shift in position; from 1st to 4th gear

Erratic upshifting

1-2 upshift, 2-3 upshift, 3-4 upshift

1-2 upshift

2-3 upshift

3-4 upshift

Harsh upshift (1-2)

Harsh upshift (2-3)

Harsh upshift (3-4)

Harsh downshift (2-1)

Harsh downshift (3-2)

Harsh downshift (4-3)

Flares on 3-4 upshift

Excessive shock on 2-3 upshift

Excessive shock on 3-4 upshift

Late
shift from position to or positions

Late shift from position to position

Noise from transmission in all shift lever positions

Vehicle does not accelerate more than 31 mph (50 km/h).

Shift
^ver
does
not
operate smoothly.

Fails to shift; stuck in 4th gear

Transmission will not shift into parking gear in position.

Stall
rpm high; all clutch pressures are in specification.

Lock-up clutch does not disengage.

Lock-up clutch does not operate smoothly.

Lock-up clutch does not engage.

No engine braking in position

No engine braking in position

Vibration in all positions

Position indicator light does not come on
Check these items on the

PROBABLE CAUSE List

1,2,3,4,5,6,7,37,42

5, 8, 9, 59, 60, 61
('96)

5, 10,
11,60

5,12,58

5, 9, 59

9,11,13,31,32,34,35,36

2, 33, 37, 48, 49

1, 2, 3, 5, 42, 45

5, 7, 9, 59

5,11,60

58

14, 33, 48, 49

41,51,52

19

19,20

45,64

51

52

51

11, 16, 17, 18, 21, 27, 59, 60, 61C97 - '98),

62C97 - '98), 63, 64

16, 17, 19, 22, 31, 60, 61C97 - '98), 62C97 - '98),

63,64

16, 17, 20, 22, 23, 28, 29, 30, 32, 61C97 - '98),

62C97 - '98), 63, 64

9, 27, 28, 59

19, 22, 29, 39

16, 17, 20, 22, 23, 24, 30, 40, 56, 61('97 - '98),

62C97 - '98), 63, 64

16, 17, 20, 22, 23, 25, 28, 30, 32, 61('97 - '98),

62C97 - '98)

16, 17, 22, 39, 46, 61C97 - '98), 62C97 - '98), 64

16, 17, 22, 23, 28, 29, 40, 46, 61
('97
-
'98),

62C97 - '98), 64

3, 9, 26

3, 18, 58

2, 4, 7, 41

14

5,43

17,51,52

5,
15,43

45

16, 17, 47, 48, 49, 50, 53, 54, 64

16, 17, 45, 47, 48, 49, 50, 53, 54, 64

16, 17, 45, 47, 48, 49, 50, 53, 54, 63, 64

7, 9, 51, 57

7, 11,51,57,59

37

5, 43, 55
Check these items

on the NOTES List

K, L, R, S

C, M, 0

C, L

C, L, Q

C, L, M

C, D

B, K, L

K, L, R

C, D

C, D

N

R

G, L

V

C, D, E, V

C, D, E, H, L, V

C, D, E, I, L, V

0

C, D, E, H

C, D, E, I

E, L, N, V

E, L, N

E, L, N

M

Q

K, L, Q

P

P

D, K, O

E, L, V

L

E, L, V

C, D

C, DProCarManuals.com

PROBABLE CAUSE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40
Low ATF

ATF pump worn or binding

Regulator valve stuck or spring worn

Mainshaft worn/damaged

Shift cable broken/out of adjustment

Secondary drive gear, secondary driven gear,

extension shaft worn/damaged

Countershaft worn/damaged

1st gears worn/damaged (2 gears)

1st clutch defective

2nd gears worn/damaged (2 gears)

2nd clutch defective

Reverse gears worn/damaged (2 gears)

Excessive ATF

Torque converter one-way clutch defective

Parking mechanism defective

Throttle valve stuck

Linear solenoid defective

1-2 shift valve stuck

2-3 shift valve stuck

3-4 shift valve stuck

2nd accumulator defective

3rd accumulator defective

4th accumulator defective

4-3 shift timing valve stuck

Foreign material in main orifice

Foreign material in 1st orifice

Foreign material in 2nd orifice

3-4 orifice control valve stuck

Foreign material in 3rd orifice

Foreign material in 4th orifice

3rd clutch defective

4th clutch defective

Engine output low

Needle bearing worn/damaged

Thrust washer worn/damaged

Clutch clearance incorrect

Drive plate defective or transmission misas-

sembly

2nd check ball stuck

3rd check ball stuck

4th check ball stuck
41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61C96)

61
('97 -'98)

62C97 - '98)

63

64
Torque converter housing or transmission

housing ball bearing worn/damaged

ATF strainer clogged

Joint in shift cable and transmission or body

worn

Modulator valve stuck

Torque converter check valve stuck

Foreign material in separator plate orifice

Lock-up timing valve stuck

Lock-up shift valve stuck

Lock-up piston defective

Lock-up control valve stuck

Shift control solenoid valve A defective

Shift control solenoid valve B defective

Lock-up control solenoid valve A defective

Lock-up control solenoid valve B defective

A/T gear position switch defective

4-3 kick-down valve stuck

1st-hold clutch defective

Reverse clutch defective

1st gear one-way clutch worn/damaged

2nd gear one-way clutch worn/damaged

CPC valve defective

Line pressure control valve defective

Main orifice control valve defective

Mainshaft speed sensor defective

Countershaft speed sensor defective

(cont'd)ProCarManuals.com

Symptom-to-Component Chart

Hydraulic System (cont'd)

The following symptoms can be caused

by improper repair or assembly

Vehicle creeps in position.

Vehicle does not move in or position.

Transmission locks up in position.

Excessive drag in transmission.

Excessive vibration, rpm related.

Main seal pops out.

Various shifting problems.

Harsh upshifts.
Check these items on the

PROBABLE CAUSE DUE TO

IMPROPER REPAIR List

R1,R2

R4

R1

R6

R7

R8

R9, R10

R11
Items on the

NOTES List

K, R

S

PROBABLE CAUSE DUE TO IMPROPER REPAIR

R1

R2

R4

R6

R7

R8

R9

R10

R11
Improper clutch clearance.

Improper gear clearance.

One-way (sprag) clutch installed upside down.

ATF pump binding.

Torque converter not fully seated in ATF pump.

Main seal improperly installed.

Springs improperly installed.

Valves improperly installed.

Check valve balls not installed.ProCarManuals.com

Set idl e rp m in gea r t o specifie d idl e speed . I f stil l n o good , adjus t moto r mount s a s outline d in engine
sectio n o f servic e manual .
I f th e larg e clutc h pisto n 0-rin g i s broken , inspec t th e pisto n groov e fo r roug h machining .
I f th e clutc h pac k is seize d o r i s excessivel y worn , inspec t th e othe r clutche s fo r wea r an d chec k th e orific e
contro l valve s an d throttl e valv e fo r fre e movement .
I f throttl e valv e is stuck , inspec t th e clutche s fo r wear .
I f th e 1- 2 shif t valv e is stuc k closed , th e transmissio n wil l no t upshift . I f stuc k open , th e transmissio n ha s
n o 1s t gear .
I f th e 4- 3 shif t timin g valv e is stuck , inspec t th e 2n d an d 3r d clutc h pack s fo r wear .
I f th e 3- 4 orific e contro l valv e is stuck , inspec t th e 3r d an d 4t h clutc h pack s fo r wear .
If th e CP C valv e is stuc k closed , th e transmissio n wil l no t shif t ou t o f 1s t gear .
Imprope r alignmen t o f AT F pum p bod y an d torqu e converte r housin g ma y caus e AT F pum p seizure . Th e
symptom s ar e mostl y a n rpm-relate d ticking nois e o r a hig h pitche d squeak .
I f th e AT F straine r i s clogge d wit h particle s o f stee l o r aluminum , inspec t th e AT F pump . I f th e pum p is O K
an d n o caus e fo r th e contaminatio n is found , replac e th e torqu e converter .
If th e 1s t clutc h feedpip e guid e in th e rea r cove r i s score d b y th e mainshaft , inspect th e bal l bearin g fo r
excessiv e movemen t i n th e transmissio n housing . I f OK , replac e th e rea r cove r a s it i s dented . Th e O-rin g
unde r th e guid e is probabl y worn .
Replac e the mainshaf t if th e bushing s for the Islan d 2nd feedpip e are loos e or damaged . If th e 1s t feedpip e
i s damage d o r ou t o f round , replac e it . I f th e 2n d feedpip e is damage d o r ou t o f round , replac e th e rea r cover .
A wor n o r damage d one-wa y (sprag ) clutc h is mostl y a resul t o f shiftin g th e transmissio n in S o r S posi -
tion whil e the wheel s rotat e in reverse , suc h as rockin g the vehicl e in snow.__________________ _
Inspect th e fram e fo r collisio n damage .
Inspec t th e revers e clutc h fo r damag e o r wear .
Inspec t botto m o f 3r d clutc h fo r swir l marks .
Replac e revers e clutc h i f wor n o r damaged . I f transmissio n make s clicking , grindin g o r whirrin g noise , als o
replac e mainshaf t revers e gear , revers e idle r gear , an d countershaf t revers e gear .
I f botto m of 3r d clutc h ha s swir l marks , an d transmissio n make s gea r noise , replac e th e countershaft .
B e ver y carefu l no t t o damag e th e torqu e converte r housin g whe n replacin g th e mai n bal l bearing . Yo u
ma y als o damag e th e AT F pum p whe n yo u torqu e dow n th e AT F pum p body . Thi s wil l resul t i s AT F pum p
seizur e if no t detected . Us e th e prope r tools .
Instal l th e mai n sea l flus h wit h th e torqu e converte r housing . I f yo u pus h it int o th e torqu e converte r
housin g unti l i t bottom s out , i t wil l bloc k th e flui d retur n passag e an d resul t i n damage .
Hars h downshift s whe n coastin g to a sto p wit h zer o throttl e ma y b e cause d b y th e linea r solenoi d no t working .
Adjustin g th e throttl e valv e body , throttl e valve , an d linea r solenoi d is essentia l fo r prope r operatio n o f th e
transmission . No t onl y doe s it affec t th e shif t qualit y i f misadjusted , bu t als o th e lock-u p clutc h operation .
A
B
C
D
E
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
V
Flush th e AT F coole r an d coole r lin e (se e flushin g procedur e in th e '95 - '98 Acur a 2.5TL Servic e Manual ,
61SW504) .
NOTES
ProCarManuals.com

Road Test

(cont'd)

4. Accelerate to about 35 mph (57 km/h) so the transmission is in 4th, then shift from position to position. The vehi-

cle should immediately begin slowing down from engine braking.

CAUTION: Do not shift from or position to or position at speeds over 63 mph (100 km/h); you may dam-

age the transmission.

5. Check for abnormal noise and clutch slippage in the following positions.

(1st Gear) Position

a. Accelerate from a stop at full throttle. Check that there is no abnormal noise or clutch slippage,

b. Upshifts should not occur with the shift lever in this position.

(2nd Gear) Position

a. Accelerate from a stop at full throttle. Check that there is no abnormal noise or clutch slippage,

b. Upshifts and downshifts should not occur with the shift lever in this position.

(Reverse) Position

Accelerate from a stop at full throttle, and check for abnormal noise and clutch slippage.

6. Test in (Parking) Position

Park the vehicle on slope (approx. 16°), apply the parking brake, and shift into position. Release the brake; the vehi-

cle should not move.ProCarManuals.com

• Clutch Pressur e Measuremen t
Whil e testing , b e carefu l o f th e rotatin g fron t wheels .
1 . Star t th e engine , an d ru n i t a t 2,00 0 rpm .
2 . Shif t t o eac h shif t leve r positio n indicate d b y th e tabl e below .
3 . Measur e eac h clutc h pressure .
1ST CLUTC H PRESSUR EINSPECTIO N HOL E
4TH CLUTC H PRESSUR EINSPECTIO N HOL E
3RD CLUTC H PRESSUR EINSPECTIO N HOL E
REVERS E CLUTC HPRESSUR E INSPECTIO NHOLE
1ST-HOL D CLUTC HPRESSUR E INSPECTIO NHOLE
2ND CLUTC H PRESSUR EINSPECTIO N HOL E
PRESSUR E
Line
1s t clutc h
1st-hol d
clutc h
2n d clutc h
2n d clutc h
3r d clutc h
4t h clutc h
Revers e
clutch SHIF
T LEVE R
POSITIO N
or
, or
or
SYMPTO M
No (o r low )
line pressur e
No o r lo w 1s t
pressur e
No o r lo w 1st -
hold pressur e
No o r lo w 2n d
pressur e
No o r lo w 2n d
pressur e
No o r lo w 3r d
pressur e
No o r lo w 4t h
pressur e
No o r lo w
Revers e
pressur e
PROBABL E CAUS E
Torqu e converter ,
AT F pump , pres -
sur e regulator ,
torqu e converte r
chec k valv e
1s t Clutc h
1st-hol d Clutc h
2n d Clutc h
2n d Clutc h
3r d Clutc h
4t h Clutc h
Revers e
Clutch
FLUID PRESSUR E
Standard
780 - 84 0 kP a
(8.0 - 8. 6 kgf/cm2,
110-120psi )
390 kP a
(4.0 kgf/cm2, 5 7 psi )
Full y close d throttl e
840 kP a
(8.6 kgf/cm2, 12 0 psi )
Mor e tha n 1/ 4 throttl e
1,170- 1,250 kPa
(11. 9 -12. 7 kgf/cm2,
169-18 1 psi )
Servic e Limi t
740 kP a
(7.5 kgf/cm2, 11 0 psi )
370 kP a
(3.8 kgf/c r
Full y clo s
740 kP a
(7.5 kgf/c r
Mor e tha r
n2, 5 4 psi )
3d throttl e
n2, 11 0 psi )
i 1/ 4 throttl e
1,130kP a
(11. 5 kgf/cm2, 16 4 psi )
(cont'd )
ProCarManuals.com