Subaru XT 1988 Service Manual page 558

3-2 AUTOMATIC TRANSMISSION AND DIFFERENTIAL
(1) Functions and Control Items
Control item
Description of control
Normal shift control
Upshifting and downshifting are set for each range, gear position and
•
Normal pattern
pattern according to throttle opening and vehicle speed.
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•
Power pattern
....
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Control with cruise control
When cruise control is set, 4th gear operating range is expanded.
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[V
~
40 km/h (25 MPH)]
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ATF low temperature control
Shifting into 4th gear is prevented when ATF temperature is below
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the preset value.
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1st hold control
1st hold range is limited only when selector lever is in "2" and 1st hold
switch is ON.
Normal lock·up control
Lock-up ON/OFF is set for each range, gear position, and pattern
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•
"Normal": "D" range only
according to throttle opening and vehicle speed. (Basically lock-up is
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•
"Power" : R, 3, 2 ranges OF F during gear shifting.)
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Smooth control
Smooth lock-up is performed when lock-up is switched on.
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Engine brake control
Overrunning clutch is operated according to range, vehicle speed, and
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cruise control signals in order to apply engine brake properly.
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3-2 timing control
Th is control speeds the release of servo piston pressure 3R when
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"08 shifting down from 3rd to 2nd, thereby preventing engine racing.
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Ordinary control
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Line pressure is regulated according to throttle opening, vehicle speed
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and range signals.
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Shifting control
Line pressure is reduced when shifting to lessen shifting shock .
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Starting control
Line pressure is at a minimum so as to reduce engine cranking load.
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Power pattern control
Power pattern is selected when throttle opening speed exceeds the
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(POWER light ON)
preset value.
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Normal pattern control
When throttle opening is less than the preset value, normal pattern is ....
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resumed immediately if vehicle speed
~
60 km/h (37 MPH), or within
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three seconds if vehicle speed
<
60 km/h (37 MPH).
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ATF temperature
Power pattern is selected if ATF temperature is above the preset value.
Shift step control
ON/OFF timing for shift solenoid is controlled.
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Lock-up control
When shifting, the lock-up clutch is temporarily released .
....
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Overrunning clutch control
When shifting down, the overrunning clutch is temporarily disconnected
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(3rd to 2nd: small throttle to reduce shifting shock.
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opening in coasting,
...
2nd to 1 st: in coasting)
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Line pressure control
When shifting, line pressure is controlled to the optimum level so as to
reduce shifting shock.
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