selected by the driver, if desired. To change the start-
ing gear, press the brake pedal and select D with the
vehicle stopped. The current gear indicator will dis-
play the starting gear. Move the shift lever up or
down until the desired starting gear is displayed.
The UltraShift DM TCU adapts to the working condi-
tions of each vehicle and its driver. After power up or
a load change, it needs to learn the new conditions.
While learning, it may hold a gear too long before
upshifting. Start the upshift manually. It may take
three or four shifts before UltraShift succeeds in
learning the new load-based shift points, but after
that it will handle the shifting automatically.
Low
Low (L) is at the lower end of the four-position selec-
tor switch located at the end of the SmartShift control
lever. To select L, press in the neutral lock button
and move the selector switch to the position below
D.
When in low, the current gear is maintained. Re-
quests to upshift are not enabled.
IMPORTANT: If the engine is approaching over-
speed, the UltraShift DM TCU will override the
current gear setting and upshift to prevent en-
gine damage.
To enhance engine braking, downshifts are per-
formed at higher rpm than normal.
If L is selected from neutral while stopped, the ve-
hicle starts up in first gear and stays there until the
engine approaches overspeed.
Upshifting
To request an upshift with the transmission in drive,
pull the control lever up (towards you). If the gear is
available, the transmission upshifts and the new gear
displays on the gear indicator. No skip shifts are
available while upshifting.
No upshifts are available in low, except to prevent
engine overspeed.
If the transmission does not upshift quickly enough
after power-up or a load change, begin the shift
manually. The UltraShift DM TCU will learn the new
load-based shift conditions after three or four shifts.
If the gear requested is unavailable, a tone will
sound. An unavailable request to upshift is not stored
in memory. The upshift must be requested again.
Downshifting
NOTE: The driver can manually downshift at
any time, even when the slide switch is set to
AUTO mode.
To request a downshift with the transmission in drive
or low, push the control lever down (away from you).
If the gear is available, the transmission downshifts
and the new gear displays on the gear indicator. Skip
shifts are available while downshifting.
For best engine braking, select low while moving. In
low, downshifts are performed at higher rpm than in
drive.
IMPORTANT: If the engine is approaching over-
speed, the UltraShift DM TCU will override the
current gear setting and upshift to prevent en-
gine damage.
If the gear requested is unavailable, a tone will
sound. An unavailable request to downshift is not
stored in memory. The downshift must be requested
again.
When coasting to a stop, the UltraShift DM TCU may
not finish the downshift until the driver presses down
on the throttle pedal again.
IMPORTANT: A downshift request can never
result in a shift into neutral, even if the vehicle is
in the drive position in the lowest possible gear.
Before starting down a hill, slow down. Downshift to
a speed that you can control without hard pressure
on the service brakes.
Before entering a curve, slow down to a safe speed.
Downshift if necessary. This lets you use some
power through the curve to help the vehicle be more
stable on the turn. It also allows you to regain speed
faster as you come out of the curve.
Ultrashift Diagnostics
Clutch Protection Fault
Excessive clutch slippage creates heat and reduces
the life of the clutch. These are some conditions
which lead to clutch abuse:
•
Using the throttle to hold the vehicle on a
grade
•
Starting the vehicle in too high a gear
Automated and Automatic Transmissions
14.9
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