Allison Transmission; Operation; Pushbutton Shift Selector; Primary And Secondary Shift Schedules - PREVOST H3-45 VIP Owner's Manual

Refer to Appendix D TPMS Troubleshooting Guide
for further details.

ALLISON TRANSMISSION

The transmission is fully automatic: Proper ranges
should be automatically selected according to driving
speeds to improve vehicle performance and control.
The speed ratio of the power converter changes
automatically as vehicle speed increases and direct-
drive goes in and out as necessary. The speed ratio
is modulated by vehicle speed and accelerator pedal
position. You will find the complete transmission
operation instructions and driving tips in the
5th Generation Bus Series Operator's Manual
available on the Prevost Technical Publication web
site.

OPERATION

When a button is depressed on the transmission
control pad, the corresponding letter or number is
displayed indicating the transmission is ready to
operate in the selected range. If the transmission
control module (TCM) detects a serious problem in
the transmission, the CHECK telltale lights on the
dashboard.
ALLISON PUSHBUTTON SHIFT SELECTOR

PUSHBUTTON SHIFT SELECTOR

The pushbutton shift selector has the following
elements:
R: Press to select Reverse gear.
N: Press to select Neutral.
D: Press to select Drive. The highest forward range
available will appear in the digital display window
under SELECT. The transmission will start out in the
lowest available forward range, displayed under
MONITOR, and advance automatically to the
highest range.
Ç È : Press respectively the Ç (Upshift) or È
(Downshift) arrow button when in DRIVE to request
the next higher or lower range. One press changes
Allison
gears by one range. If the button is held down, the
selection will scroll up or down until the button is
released or until the highest or lowest possible range
is selected. Protection mechanisms inhibit selecting
ranges that are not appropriate for the current speed
or which may damage driveline components.
MODE: Pressing the MODE button allows the driver
to activate the secondary shift schedule that has
been programed into the TCM unit.
PRIMARY AND SECONDARY SHIFT
SCHEDULES
The primary shift schedule is the default mode at
starting of the engine and is typically specified to
accommodate normal
transmission
between ECONOMY and PERFORMANCE shift
strategy, based on the vehicle actual load and the
grade on which the vehicle is operating. This is
called Load Based Shift Scheduling (LBSS). This
can produce improved overall vehicle fuel economy
while still enabling high productivity when the vehicle
is loaded.
In
ECONOMY shift strategy is available. No switching
is done between shift strategies. The secondary shift
mode is available only if selected by the driver, using
the MODE button. When the secondary mode is
activated, "MODE" illuminates on the display.
PA-1638 Owner's Manual X3-45 VIP
Controls and Instruments 4-55
vehicle operation. The
controller
the secondary shift
automatically selects
schedule, only the