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Description
Lock-up System (cont'd)
TORaUE CONVERTER
SOLENOID VALVE
r
ill~tl:f~~~~:f~
LOCK-UP
CONTROL
..,
1~~=~~!~VACLOVENInER1"Eid
LOCK-UP TIMING
VALVE
RELIEF VALVE
PRESSURE
.... ---.... -+-
SUB-SHAFT
H
REGULATOR
VALVE
R
Half Lock-up
•
Lock-up Control Solenoid Valve A: ON
•
Lock-up Control Solenoid Valve
B:
Duty
Operation
OFF -
ON
•
Linear
Solenoid
Pressure:
Low
The PCM
switches solenoid valve
A
on to
release modu-
lator
pressure
in
the left
cavity
of the
lock-up
shift valve.
Modulator pressure
in
the
right
cavity
of the lock-up
shift valve overcomes the spring force, and the
lock-up
shift valve is moved to the
left
side.
line pressure is then separated into the two
passages
to
the torque
converter; torque converter inner pressure
enters
into
right side to engage the
lock-up
clutch,
and
torque
converter back pressure
enters
into
left
side
to
disengage the
lock-up
clutch.
Back
pressure
(F2)
is
reg
ulated
by
the
lock-up
control
valve,
whereas
the position
of
the lock-up timing valve
is determined by linear solenoid pressure and tension of
the
valve spring.
Also the
position of the
lock-up
control
valve is determined by
the back
pressure of
the lock-up
control
valve, torque
converter pressure (regulated
by
the torque
converter
check
valve),
and
modulator pres-
sure
(determined
by
the lock-up
control solenoid valve
B). The PCM
switches
lock-up
control solenoid valve
B
on and
off
rapidly (duty operation), under
certa in
condi-
tions,
to
regulate
back
pressure
(F2)
and lock
the
torque
converter
.
NOTE:
When
used, "
left" and
"right" indicates di rection
on the hydraulic circuit.
L-----~=~=~==1I====
_
LINEAR SOLENOID PRESSURE
COOLER RELIEF VALVE
ATF STRAINER
14-42
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Troubleshooting
