Operation - PREVOST Motorcoach XL Series Operator's Manual

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The operation and driving of this vehicle with an
automatic transmission is similar to that of an
automobile
equipped
transmission. Proper ranges should be selected
according to driving speeds to improve vehicle
performance and control.
fully automatic. Speed ratio of power converter
changes automatically as vehicle speed increases
and direct-drive goes in and out as necessary,
modulated by vehicle speed, and accelerator
position.
Range selection - Push-button shifter
The push-button shifter is used by the operator to
select Neutral (N), Reverse gear (R), or a range of
forward gears. When a forward gear range has
been selected, the transmission starts in the
lowest gear of the range and, as conditions
permit, automatically upshifts until the highest
gear in the selected range is in use.
The digital display indicates the readout of two (2)
digits:
SELECT -
Range of gears selected by the
operator.
MONITOR -
Current gear of transmission

operation.

Each time a button is pressed on the shifter a
short "beep" will be heard to identify that the ECU
has received instructions to change operation.
The function of each button is as follows:
Select REVERSE gear by pressing "R".
with
an
automatic
The transmission is
18015
Select NEUTRAL by pressing "N".
raised edge around the "N" button so the driver
can orient his hand to the push-buttons by touch,
without looking at the display. It is not necessary
to press this button prior to starting the vehicle.
Select DRIVE range by pressing "D". The highest
forward gear will appear on the SELECT display
and the transmission will shift to the starting gear
as indicated on the MONITOR display.
The UPSHIFT and DOWNSHIFT (arrow) buttons
are used to shift to a higher (if not in "D") or lower
(if not in "1") range selected. One press changes
the range selected by one range. If the button is
pressed
continuously,
continues to change up or down until the button is
released or until the highest or lowest possible
range of gears is selected.
Function of the mode button
This button is used to invoke a special function
that has been programmed into the ECU. This
function is the "ECONOMY" mode which allows
for more efficient operation of the transmission
and thereby helps contribute to improved fuel
economy. The mode status will be indicated on
the digital display by lighting MODE ON when the
function has been selected.
Shift schedule
PRIMARY - This shift schedule is used each time
the vehicle is started. Typically, this is used for
normal vehicle operation.
SECONDARY
schedule that the ECU may use upon request.
Select the secondary shift schedule (ECONOMY)
via the MODE button.
HOLD UPSHIFT - This shift schedule permits
upshifts if an overspeed condition could occur by
the transmission remaining in a lower range.
These shifts occur at speeds higher than normal
upshifts.
In most cases the control system logic protects
the transmission from abuse. Such actions as full
throttle neutral-to-range shifts and high speed
direction changes are inhibited.
Operation
When a push-button pad is depressed, a beep
sounds and the pad lights up indicating the
2 - 21
CONTROLS/INSTRUMENTS
Note the
the
range
- This is an alternate shift
selected

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