torque fall outside of the acceptable range to
perform a shift. If the shift is denied, a tone will
sound.
NOTE: If attempting to select a non-Neutral
mode without applying the service brakes, the
transmission will not shift into gear. To shift into
gear, select Neutral, apply the service brakes,
and select the desired mode again.
Manual Mode Override
The system is equipped with a manual mode
override function. If the vehicle is being "back driven"
(for example, descending a grade and the engine
speed is excessively high), the system will upshift
automatically. Also, if the start gear is changed and it
causes the engine to lug at takeoff, the system will
override the current position and select the best
available gear.
Low (L)
Use Low when wanting to maximize engine braking
and minimize the use of the brake pedal—for
example, when driving down long grades or when
coming to a stop. To select Low, push down on the
multi-function stalk switch, and hold in the down-shift
position for half a second or more. The lowest
available start gear will be selected (the starting gear
cannot be changed in Low).
If Low is selected while moving, the transmission will
not upshift (unless the system initiates a Low
override). The system will downshift at the earliest
opportunity to provide maximum engine braking.
NOTE: If attempting to select a non-Neutral
mode without applying the service brakes, the
transmission will not shift into gear. To shift into
gear, select Neutral, apply the service brakes,
and select the desired mode again.
Low Override
The system is equipped with a Low override function.
If the vehicle is being "back driven" (for example,
descending a grade and the engine speed is
excessively high), the system will upshift
automatically. Also, if the start gear is changed and it
causes the engine to lug at takeoff, the system will
override the current position and downshift.
Push-Button Shift Selector
Gear information is presented to the driver on the
push-button shift selector, shown in
Fig. 14.10,
usually mounted on the right-hand control panel. On
this display, the information is presented as follows:
•
To select neutral, press the N button. When
neutral is engaged, the telltale LED will light up
next to the N button.
•
To select reverse, press the R button. When
reverse is engaged, the telltale LED will light
up next to the R button.
•
To select drive, press the D button. When drive
is engaged, the telltale LED will light up next to
the D button.
•
To select low gear, press the LOW button.
When low is engaged, the telltale LED will light
up next to the LOW button.
•
To change gears manually, press the MANUAL
button. When the manual mode is engaged,
the telltale LED will light up next to the
MANUAL button.
•
Use the shift buttons (upshift/downshift) to
change the current starting gear selection in R,
D, and LOW. In MANUAL, the shift buttons can
be used to select gears.
•
In automatic mode, the number of the forward
gear currently engaged appears continually on
the mode indicator when in drive. In MANUAL,
the last gear selected appears on the mode
indicator.
•
If the SERVICE indicator illuminates, take the
vehicle as soon as possible to an authorized
Freightliner service facility.
•
The mode button is reserved for future use.
IMPORTANT: To prevent engine overspeed, the
transmission software will override both
MANUAL and LOW if necessary. The system
will not respond to gear selection requests that
will either overspeed or excessively lug the
engine.
Automatic Mode
When the transmission is in automatic mode, the
transmission automatically selects and engages the
gears, although the transmission will respond to
upshift and downshift requests as though in manual
mode. See the instructions for shifting under heading
’Manual Mode’ below.
Automated and Automatic Transmissions
14.9
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