Page 713 of 2189
I
TOROUE CONVERTER
No Lock-up
. Lock-up Control Solenoid Valve A: OFF
. Lock-up Control Solenoid Valve B: OFF
. Linear Solenoid Pressure: High
The pressurized fluid regulated by the modulator works
on both ends of the lock-up shift valve. Under this condi-
tion, the pressures working on both ends of the lock-up
shift valve are equal, the lock-up shift valve is moved to
the right side by the tension of the valve spring alone.
The fluid from the ATF pump will flow through the left
side of the lock-up clutch to the torque convener; that is,
the lock-up clutch is in OFF condition.
NOTE: When used, "left" or "right" indicates direction
on the hydraulic circuit.
MOOULATOR PRESSURE
LINEAR SOLENOIO PRESSURE
(cont'd)
LOCK.UP CONTROLSOLENOID VALVE
RELIEF VALVE
LOCK-UP TIMINGVALVE
9 L ] I COOLER RELIEF VALVE
ATF PUMP
14-35
Page 714 of 2189

Description
Lock-up System (cont'dl
TOROUE CONVERTER
Half Lock-up
. Lock-up Control Solenoid Valve A: ONLock-up Control Solenoid Valve 8: Duty Operation
OFF - ONLinear Solenoid Pressure: Low
The PCM switches the solenoid valve A on to release themodulator pressure in the left cavity of the lock_up shiftvalve. The modulator pressure in the right cavity of thelock-up shift valve overcomes the spring force; thus thelock-up shift valve is moved to the left side.The line pressure is then separated into the two pas-sages to the torque converter:
Torque Converter Inner pressure: enters into rightsade to engage lock-up clutch
Torque Converter Back pressure: enters into left sideto diseogage lock-up clutchThe back pressure (F2) is regulated by the lock-up con-trol valve, whereas the position of the lock-up timingvalve is determined by the linear solenoid Dressure andtension of the valve spring. Also the position of the lock_up control valve is determined by the back pressure ofthe lock-up control valve, torque converter pressure reg_ulated by the torque converter check valve, and modula_tor pressure determined by the lock-up control solenoidvalve B. The PCM switches the lock-up control solenoidvalve B on and off rapidly {duty operation} under certainconditions to regulate the back pressure (F2) to lock thetorque convener properly.
NOTE: When used, "left" or "right" indicates directionon the hvdraulic circuit.
MODULATOR PRESSURE
LINEAR SOLENOTD PRESSURE
LOCK.UP CONTROLVALVE
LOCK.UP CONTROLSOI.TNOID VALVE
A8
TOROUE CONVERTERCHECK VAI-VE
RELIEF VALVE
LOCK-UP TIMINGVALVE
^ L____J'r cooLER RELTEF valvE
14-36
ATF PUMP
Page 715 of 2189

TOROUE CONVERTER
Full Lock-up
. Lock-up Control Solenoid Valve A: ON
. Lock-up Control Solenoid Valve B: ON
o Linear Solenoid Pressure: High
When the vehicle speed further increases. the linear
solenoid pressure is increased to high in accordance
with the linear solenoid controlled bv the PCM.
The lock-up timing valve overcomes the spring force
and moves to the left side. Also, this valve closes the
fluid port leading to the left side of the lock-up control
Under this condition. the modulator pressure in the left
side of the lock-up control valve had already been
released by the lock-up control solenoid valve B; the
lock-up control valve js moved to the left side. As this
takes place, the torque converter back pressure is
released fully. causing the lock-up clutch to be engaged
fully.
NOTE: When used, "|eft" or "right" indicates direction
on the hvdraulic circuit.
MODULATOR PRESSURE
LINEAR SOLENOIO PRESSURE
{cont'd)
LOCK.UP CONTROLSOLENOID VALVE
RELIEF VALVE
LOCK.UP TIMINGVALVE
'r ,-.r' cooLER RELTEF vALvE
ATF PUMP
14-37
Page 716 of 2189
Description
Lock-up System (cont'dl
TOROUE CONVERTER
Deceleration Lock-up
. Lock-up Control Solenoid Valve A: ON. Lock-up Control Solenoid Valve B: Duty Operation
OFF - ONa Linear Solenoid Pressure: Low
The PCM switches solenoid valve B on and off rapidly
under certain conditions. The slight lock-up and half
lock-up regions are maintained so as to lock the torque
converter properly.
NOTE: When used, "left" or "right" indicates direction
on the hydraulic circuit,
MOOULATOR PRESSURE
LINEAR SOLENOID PRESSURE
LOCK-UP CONTROLSOLENOID VALVE
RELIEF VALVE
LOCK.UP TIMINGVALVE
COOLER RELIEF VALVE
ATF STRAINER
1434
ATF PUMP
Page 717 of 2189
Component Locations
POWERTRAIN CONTROLMODULE (PCM)
TRANSAXLE {A/TI
COUNI€RSHAFTSPEED SENSOR
SOI,TNOID VALVEASSEMBLY
SOLENOID VALVEASSEMBLY
GEAR POSITION SWITCH
SPEED SENSOR
1+39
Page 718 of 2189
PGM Gircuit Diagram (A/T Control System: '96 - 98 Modelsl
UNDEfl -HOOD FUSE/RELAY BOX
No.41 (80A1 N0.42 l40A)
No.47 {7.5 A)
No.l3 (15A)
Arp Np lon,^o l r,, lotrr l 6lt l 3]t lot*
UNDER DASHFUSE/REIAY 8OX
/8LU
c10
YEUBLKBtK
424
Btx
At0423
'96:BLU/BED'97, '98r GFN/BLK
TTTYEL GRN BLULT GRN
BLK/BTU
RED
GRNiELK
F- BTK/BI.U
F_wHr
F- GRN
f- GRN
F- Bru
GRN
BLU
NorE: t :ro5v
T :ro 12v
GAUGE ASSEMBTY
A,T GEAR POSITIONINDICATOR
824 t88 tB17'96: GRN 8LU
'96: BLU/RED al'97,'98: GRN/8LK --
Page 719 of 2189
SERVICE CHECK CONNECTOR
LOCK -UP CONTROLSOLENOIO VALVEASSEMELY
RED WHT
tlll'
IT
tl
ll
Lo-l
MAINSHAFTSPEED SENSOR
TBRNiBLK
I
I
I-
G 101
NCSG ILS - ILS + ISH A ISH B ltc A ltc B
SHIF'CONTROLSOTENOID VALVEASSEMEI-Y
PCM Terminel Locations
14-41
Page 720 of 2189

PCM Terminal Voltage/Measuring Gonditions ('96 - 9g Models)
A/T Control System
The PCM terminal voltage and measuring conditions are shown for the connector terminals that relate to the A"/T controlsystem. The other PCM terminal voltage and measuring conditions are described in section I l.
A l32P) Conn€ctotB I25P) ConnectorC (31P)ConngctorD (16P)Connector
PCM CONNECTOR A I32P}
Terminal NumborSignalDcacriptionMoasuring Conditions/Te.minal Voltage
A1 to A8- see section 1 I -
A9LG1Ground
A10PG1Grou nd
A11IGPlPower supply systemWith ignition switch ON (ll): 8attery voltage
With ignition switch OFF: 0 V
412 to A2l- see section I I -
Ground
423PG2Ground
A'24IG P2Power supply systemWith ignition switch ON (ll): Battery voltage
With ignition switch OFF: 0 V
A25 to A32- see section l1 -
PCM CONNECTOR B (25P}
Terminal NumberSignalDescriptionMeasuring Conditions/T6rminal Voltage
B1LS-Linear solenoid power supply
negative electrode
lgnition switch ON (ll): Pulsing signa.
82Linear solenoid power supplypositive electrode
lgnition switch ON (ll): Pulsing signal
SHAShitt control solenoid valve A
controlIn 2nd gear and 3rd gear in E, E position,
and in @, @ position: Battery voltage
In lst gear and 4th gear in E. E position: 0 V
B4LCBLock-up control solenoid valve B
control
When full lock-up: Battery voltage
When half lock-up: Pulsing signal
B5LCALock-up control sol€noid valve AcontrolWhen lock-up is ON: Battery voltage
With no lock-up: 0 V
86 to 87Not used
B8ATP D3IVT g6ar position switch @ posi-
tion signal input
lnEposition; OV
In other than E position: Battery voltage
Bg to 810Not used
\-
14-42