2006 Forester XT Limited
Does my 2006 forester xt limited have a down hill descent assist on it? If so, how do i use it?
1999 4EAT Transmission Operation
There are seven different shift schedules/
maps in the TCM logic control of
the 1999 Second Generation 4EAT. They
are Normal, Power, Slope, Hold 2nd,
Cruise, Hot ATF, Cold ATF. The shift
schedule/map will determine how and
when the transmission shifts. For example,
in the slope mode, when driving up
a hill under certain engine load conditions,
the TCM will shift the transmission
back down to 3rd gear.
In most cases, the transmission will
stay in 3rd gear until the vehicle reaches
the top of the hill, then it will upshift.
This is done to keep the transmission
from upshifting/downshifting in and out
of 4th gear needlessly. On the uphill
control, the slope angle is estimated
from the throttle opening angle and
vehicle speed change. When the TCU
detects that the vehicle is moving
uphill, upshifting is restrained by selecting
a special shift map, which prevent
When driving downhill, under coasting
conditions, if the driver touches the
brake pedal, the TCM will downshift the
transmission into 3rd gear to provide
engine braking. This downhill control is
canceled when the TCU detects the
vehicle acceleration by the driver’s
depressing of the accelerator pedal and
input from the Throttle Position Sensor.
Both of these conditions are part of
the slope control logic and are a characteristic
of the vehicle TCM logic.
Our Sienna does the same thing and I would not equate it to the kind of downhill assist that some off-road machines have. Its for a different purpose, to add a bit of engine braking on longer hills at highway speeds. The off-road kind, as noted, actually applies the brakes to help control, at low speeds, descents on very steep slopes.My wife's 2004 Highlander has it. At speeds above 50, if you touch the brake pedal for a few seconds, the transmission shifts from 5th to 4th and provides an additional engine braking effect. Otherwise it feels like it's free wheeling when going downhill.
Never having owned an automatic Subaru, I can't speak to this feature on the 4EAT or the 5EAT on the Legacy/Outback.
This control regulates shifting up from 3rd to 4th
gear when traveling uphill and forcefully downshifts
from the 4th to 3rd gear when traveling downhill.
The TCM determines the driving force of the traveling
vehicle from input of the speed sensor signals,
throttle signal, turbine sensor signal, etc., and forcefully
maintains 3rd gear.