Subaru XT 1988 Service Manual page 521

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3-2
Content of lock-up control
Lock-up control
Lock-up on
Duty ratio 95%
Lock-up off
Duty ratio 5%
Control content
(1) Normal • Lockup on/off characteristics are set for
control each range, gear position and pattern by
throttle opening and vehicle speed.
• Fuel consumption, power performance
and shift characteristics are taken into
account.
Range Mode Purpose
Normal Lower fuel consumption
D
Power Higher performance
(2) Smooth When switching from lock-up off to lock-up
control on, oil pressure for "lock-up apply" is
changed gradually to ensu re smooth lock-up
operation.
7
Remarks
Fully·open
2nd 3rd 4th
I
q::::
I
I LU I LU LU
Fully-clo5ed
0
Fig. 10
I
if('
/
/
/
/
/ /
/ /
/ /
(
/
OPEN: I
I I
Vehicle speed
L3-588
• Lock-up non-operation condition
1) ATF temperature 40°C (104°F) or
lower.
2) 1st speed, N, R, P.
3) During gear shifting.
4) When throttle is fully closed. If V>
140 km/h (87 MPH), lock-up operates
even when throttle is fully closed.
5) Rapid accelerator pedal depression.