Acura MDX 2009 Manual page 348

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Automatic Transmission
The transmission may automatically
downshift from the higher gear to
the lower gear under these
conditions:
Driving on level roads and downhill
To shift from Speed range
4 → 3
under 19 mph
(31 km/h)
5 → 4
under 38 mph
(60 km/h)
Driving uphill
To shift from Speed range
4 → 3
under 34 mph
(55 km/h)
5 → 4
under 47 mph
(75 km/h)
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Table Of Contents
Downshifting gives you more power
when climbing, and provides engine
braking when going down a steep
hill.
The transmission also shifts
automatically as the vehicle comes to
a complete stop. It downshifts to first
gear when the vehicle speed is under
10 mph (16 km/h).
2009 MDX
If you try to manually downshift at a
speed that would cause the engine to
exceed the redline in a lower gear,
the transmission does not downshift.
The gear indicator will flash the
number of the lower gear several
times, then return to the higher gear.
If the vehicle speed slows to below
the redline of the selected lower gear
position while the indicator is
flashing, the transmission
downshifts, and the display shows
the selected lower gear.