Subaru LEGACY 2002 Quick Reference Index page 303

C: SHIFT CONTROL
The TCM performs gear shifting control according to driving conditions by using the shift point
characteristic data stored in its memory. Appropriate solenoids are operated at the proper timing
corresponding to the shift pattern, throttle position, and vehicle speed for smooth shifting.
NOTE:
When the ATF temperature is below approximately 10°C (50°F), the gear cannot be shifted to the
4th speed.
! The TCM activates both solenoids 1 and 2 in response to throttle and vehicle speed signals.
! Shift valves move in response to operation of the solenoids, supplying or interrupting the line
pressure to each clutch.
! A shift to each gear takes place according to ON-OFF operation of both the solenoids as indi-
cated in the table above.
TRANSMISSION CONTROL MODULE (TCM)
Determination of optimum
gear position (including
selection of shift pattern)
AT-27
Automatic Transmission
G3H0752
Vehicle speed
sensor
Throttle
position
sensor
G3H0753A