Subaru LEGACY 2002 Quick Reference Index page 308

Automatic Transmission
H: GRADE CONTROL
While the vehicle is driving up a hill, the gear is fixed to the 3rd to avoid repeated gear shift be-
tween the 3rd and 4th gears.
When the vehicle is descending a steep slope at a speed of approximately 80 km/hour (50 miles/
hour), a 4th to 3rd downshift occurs automatically when the brake pedal is depressed.
This gearshift control is cancelled when the accelerator pedal is depressed.
The TCM performs these controls based mainly on the throttle opening, engine speed and vehicle
speed.
WITHOUT GRADE CONTROL
D4
WITH GRADE CONTROL
D4
"D" range (Base pattern)
Throttle
opening
1 2
1 2 2
0
TRANSMISSION CONTROL MODULE (TCM)
D4 D3
D3
2 3 3
3 3 4
Vehicle speed
D4
BRAKE PEDAL
ON
"D" range (Grade control pattern)
Throttle
opening
4
1 2
0
AT-32
D4
D3
RE-ACCELERATION
1 2 2 3
2 3 3 4
D4
B3H1751A
3 4
Vehicle speed
B3H1755A