1995 ACURA TL Service Repair Manual

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

Description

Lock-up System (cont'd)

Deceleration Lock-up

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

The PCM switches solenoid valve B on and off rapidly under certain conditions. The slight lock-up and half lock-up regions

are maintained to lock the torque converter properly.

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

Parking Brak e Mechanis m
Shifting t o
brak e paw l ont o th e parkin g gear . Eve n i f th e en d o f th e parkin g brak e paw l ride s o n to p o f th e parkin g gea r teeth . sligh t
movemen t o f th e countershaf t wil l caus e th e parkin g brak e paw l an d th e parkin g gea r t o mes h wit h eac h othe r completel y
becaus e th e parkin g brak e con e receive s tensio n fro m th e parkin g brak e ro d spring . Th e parkin g brak e paw l receive s th e
tensio n (whic h act s t o separat e th e parkin g brak e paw l fro m th e parkin g gear ) fro m th e parkin g paw l spring .
COUNTERSHAF T
PARKIN G BRAK E
RO D SPRIN G
PARKIN G BRAK E
PAW L PARKIN
G GEA R
PARKIN G BRAK E
RO D HOLDE R
PARKIN G BRAK E CON E
positio n cause s th e parkin g brak e con e (installe d a t th e en d o f th e parkin g brak e rod ) t o pres s th e parkin g
Th
e parkin g brak e mechanis m lock s th e transmissio n b y engagin g th e parkin g brak e paw l wit h th e parkin g gea r whic h i s
spline d t o th e countershaft .
ProCarManuals.com

A/T Contro l Syste m
The PC M termina l voltag e an d measurin g condition s ar e show n fo r th e connecto r terminal s tha t ar e relate d t o th e A/ T con -
tro l system . Th e othe r PC M termina l voltag e an d measurin g condition s ar e describe d i n sectio n 11.
PC M CONNECTO R A (26P )
Termina l Numbe r
A1 to A11
A12
A13
A14 to A24
A2 5
A2 6
Signa l Descriptio n Measurin g Conditions/Termina l Voltag e
-see section 11 -
PG1
IGP 1
Groun d
Power suppl y syste m With ignitio n switc h O N (II) : Batter y
With ignitio n switc h OFF : 0 V
voltag e
- see section 11 -
PG2
LG1
Groun d
Groun d
PC M CONNECTO R B (16P )
Termina l Numbe r
B1
B 2 to B 8
B9
B10 to B12
B1 3
B14 to B16
Signa l
IGP2
Descriptio n
Power suppl y syste m
Measurin g Conditions/Termina l Voltag e
With ignitio n switc h O N (II) : Batter y voltag e
Wit h ignitio n switc h OFF : 0 V
- se e sectio n 1 1 -
LG 2Groun d
- se e sectio n 1 1 -
VS SVehicl e Spee d Senso r (VSS )
signa l Inpu tWith ignitio n switc h O N (II ) an d rotatin g fron t
wheels : 0V - 5V cycle
- see section 11 -
PCM CONNECTO R C (12P )
Termina l Numbe r
C1 t o C 4
C5
C6 to C12
Signa lDescriptio nMeasuring Conditions/Termina l Voltag e
-see sectio n 1 1 -
SC SServic e chec k signa l
With ignitio n switc h O N (II ) an d servic e chec k
connecto r open : 5 V
Wit h ignitio n switc h O N (II ) an d servic e chec k
connecto r connecte d wit h specia l tool : 0 V
- see section 11 -
PCM Termina l Voltage/Measurin g Condition s
ProCarManuals.com

PCM CONNECTO R D (22P )
Termina l Numbe r
D1
D 2 to D 5
D6
D7
D 8 to D2 0
D21
D2 2
Signa l
VBU
Descriptio n
Back-up powe r syste m
Measurin g Conditions/Termina l Voltag e
Always batter y voltag e
- se e sectio n 1 1 -
TP S
EC T
Throttl e Positio n (TP ) senso r
signa l inpu t
Engin e Coolan t Temperatur e
(ECT ) senso r signa l inpu t Wit
h ignitio n switc h O N (II ) an d throttl e full y
open : Abou t 4. 8 V
Wit h ignitio n switc h O N (II ) an d throttl e full y
closed : Abou t 0. 1 V
Wit h ignitio n switc h O N (II ) an d dependin g o n
engin e coolan t temperature : Abou t 0. 1 V - 4. 8 V
-se e sectio n 1 1 -
VCC 2
SG2
Sensor s powe r suppl y circui t
Sensor s groun d Wit
h ignitio n switc h O N (II) : Abou t 5 V
PC M CONNECTO R E (26P )
(cont'd )
Termina l Numbe r
E1
E2
Signa l Descriptio
n
Measuring Conditions/Termina l Voltag e
Powe r suppl y circui t fo r shif t an d
lock-u p contro l solenoi d valve s
VBSO L
STOP S WBrak e switc h signa l inpu t
E3
E 4
E5
E 6
E7
E 8
E9
E1 0
E1 1
E1 2SH A
ATP 1
ATP2
ATPD
3
ATPD 4
ATPR
TCSF T
NC
NM
LS +Linea r solenoi d powe r suppl y
positiv e electrod e
Mainshaf t spee d senso r signa l
input
Countershaf t spee d senso r signa l
input
A/T gea r positio n signa l fo r
tractio n contro l outpu t
Shif t contro l solenoi d valv e A
contro l Wit
h ignitio n switc h O N (II) : Batter y voltag e
Wit h ignitio n switc h OFF : 0 V
Wit h ignitio n switc h O N (II ) an d brak e peda l
depressed : Batter y voltag e
Wit h ignitio n switc h O N (II ) an d brak e peda l
released : 0 V
Wit h ignitio n switc h O N (II) : Pulsin g signa l
Dependin g o n vehicl e speed : Pulsin g signa l
Whe n engin e is stopped : 0 V
Dependin g o n vehicl e speed : Pulsin g signa l
Whe n vehicl e is stopped : 0 V
Wit h ignitio n switc h O N (II) : Pulsin g signa l
posi -
posi -
posi -
posi -
posi -A/T gea r positio n switc h
tion signa l inpu t
A/T gea r positio n switc h
tion signa l inpu t
A/T gea r positio n switc h
tio n signa l inpu t
A/ T gea r positio n switc h
tio n signa l inpu t
A/ T gea r positio n switc h
tio n signa l inpu t
position , i n
position : 0 V
4t h gea r i n
position
, i n 2n d an d 3r d gea r i n
position : Batter y voltag e
In
Inposition , i n 1s t gea r i n
position
: Batter y voltag e
I n othe r tha n
Inposition : 0 V
In
In othe r tha n
position
: 0 V
position : Batter y voltag e
In
I n
othe r tha n
position : 0 V
position : Batter y voltag e
position
: Batter y voltag e
I n othe r tha n
position
: 0 V
In
In
I n
position : 0 V
othe r tha n position : Batter y voltag e
ProCarManuals.com

PCM CONNECTO R E (26P ) (cont'd )
Termina l Numbe r
E13
EH
E1 5
E16
E17
E1 8
E19
E2 0
E21
E2 2
E23
E2 4
E2 5
E2 6
Signa l
LCA
LS-
NMS G
NCSG
ILU
D4IN D
ATPP N
SHB
LCB
Descriptio n
Lock-up contro l solenoi d valv e A
contro l
No t use d
No t use d
Linea r solenoi d powe r suppl y
negativ e electrod e
Mainshaf t speed senso r groun d
Countershaf t spee d senso r groun d
No t use d
No t use d
No t use d
Interloc k contro l
A/T gea r positio n switc h posi -
tio n signa l outpu t
A/T gea r positio n switc h an d
positio n signal s outpu t
Shif t contro l solenoi d valv e B
contro l
Lock-u p contro l solenoi d valv e B
contro l
Measurin g Conditions/Termina l Voltag e
When lock-u p is ON : Batter y voltag e
Wit h n o lock-up : 0 V
Wit h ignitio n switc h O N (II) : Pulsin g signa l
Always : 0 V
Always : 0 V
Whe n ignitio n switc h i s O N (II) , brak e peda l
depresse d an d accelerato r peda l released :
Batter y voltag e
When ignitio n switc h is firs t turne d O N (II) :
Batter y voltag e fo r tw o second s
In position : 5 V o r mor e
In othe r tha n position : 0 V
In an d positions : 5 V or mor e
In othe r tha n an d positions : 0 V
In , position , i n 1s t an d 2n d gea r i n S3 , @
position : Batter y voltag e
In 3r d gea r i n , position , i n 4t h gea r i n E
position : 0 V
Durin g hal f an d ful l lock-u p an d durin g deceler -
ation : Pulsin g 0 V an d batter y voltag e
Durin g n o lock-up: 0 V
PC M CONNECTO R F (8P )
Termina l Numbe r
F1 t o F 8
Signa lDescriptio nMeasuring Conditions/Termina l Voltag e
- se e section 11-
A/ T Contro l Syste m (cont'd )
PCM Termina l Voltage/Measurin g Condition s
ProCarManuals.com

Component Locations

POWERTRAIN CONTROL

MODULE (PCM)

PGM-FI

MAIN RELAY

COUNTERSHAFT

SPEED SENSOR
MAINSHAFT SPEED SENSOR

LOCK-UP CONTROL

SOLENOID VALVE

A/B ASSEMBLY
SHIFT CONTROL SOLENOID

VALVE A/B

(Located in transmission.)

VEHICLE SPEED

SENSOR(VSS)
LINEAR SOLENOID

(Located in transmission.)
AUTOMATIC TRANSAXLE (A/T)

GEAR POSITION SWITCHProCarManuals.com