Detroit Automated Transmissions (Dt12) - freightliner M2 Plus 2023 Manual

Automated and Automatic Transmissions
02/17/2017
0. Off
1. Low
Fig. 14.2, Engine Brake Positions
Gear Display
The current transmission gear and driving mode are
displayed in the static menu at the bottom of the
driver display screen. See
06/13/2016
1. Suggested Shift
2. Current Gear
Fig. 14.3, Typical Gear Display (Detroit and Eaton)
Selected Gear (Detroit and Eaton
Transmissions)
If the selected gear is different than the current gear
for longer than a half second, the current gear
display will flash and the selected gear value will be
shown. Once the current gear and selected gear
match, the selected gear display disappears and the
current gear display stops flashing.
14.3
0
1
2
3
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2. Medium
3. High
Fig. 14.3.
1 2
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3. Driving Mode
Suggested Shift (Detroit and Eaton
Transmissions)
In Manual mode only (if available), a suggested shift
is displayed to indicate the most economical gear
available. The suggested shift is the number of up or
down arrows from the current gear with a maximum
of three up or down arrows.
™
Detroit
Transmissions (DT12)
Detroit transmissions have twelve forward gears and
up to four reverse gears that can be shifted
automatically or manually. Shifting and clutch
actuation are computer controlled, and there is no
clutch pedal needed to operate the vehicle.
Automatic shifts are selected for fuel economy or
engine power. Manual shifts can be requested with
the shift control and the transmission ECU grants
them when conditions permit. In all cases, shifts
depend on the following factors: engine speed,
accelerator pedal position, service brake usage,
engine brake operation, vehicle load status, and road
conditions.
NOTE: To avoid potential engine stall risk or
unexpected shifting, use the interaxle differential
lock when the vehicle is operated in slippery
conditions. See
about the interaxle differential lock.
3
Driving Modes
There are three driving modes: Manual, Automatic
Economy, and Automatic Performance. To activate
the manual drive mode, press and hold the mode
switch briefly. Press the switch quickly to activate the
automatic drive mode or change between modes.
See Fig. 14.1.
In Automatic Economy mode, gear shifts are
designed for saving fuel. In Automatic Performance
mode, gear shifts are designed for higher
performance and are made at higher engine speeds.
In manual mode, gear shifts are requested manually.
NOTE: In Automatic Performance mode, the
transmission will automatically change to
Automatic Economy mode if it hasn't received a
request for more power in several minutes,
unless current road conditions require higher
engine performance.
Automated
Chapter 19 for information