PREVOST H3-41 Manual page 48

CONTROLS & INSTRUMENTS
CONTROL PAD
The " " and " " buttons are used to shift to a
higher or lower (if not in "1") range selected. One
press changes 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 gear is selected. Protection
mechanisms should inhibit selecting ranges that
are not appropriate or which may damage
driveline components.
Function of the Mode Button
This button is used to invoke a special function
(mode) that has been programmed into the ECU.
Both modes are equivalent from the first to the
fourth gear as the transmission upshifts at around
2000 rpm.
• the default "ECONOMY" mode allows for
upshifts in fifth and sixth gear at around 1700
rpm. This is a more efficient operation of the
transmission and thereby helps contribute to
improve fuel economy.
• the
"PERF" (performance)
upshifts at 2000 rpm in fifth and sixth gears.
This makes for better performance than the
economy mode but with a higher fuel
consumption. It is recommended this mode be
selected while driving up or down grades. The
Oil level display mode (optional)
Select oil level display mode by pressing
simultaneously on the " " and " " keys. A first
press will indicate the transmission oil level after a
two minute wait if the following conditions are
met:
• the vehicle is parked;
• the engine is in slow idle;
• normal operating temperature is attained;
• transmission is in NEUTRAL;
• the sender unit is present and working.
A code will be displayed one digit at a time:
• O L - O K (oil level is correct)
• L O - 0 1
• L O - 0 2
• H I - 0 1
• H I - 0 2
Note :
error code will be displayed:
• O L - 5 0
• O L - 5 9 (engine RPM too high)
• O L - 6 5 (transmission not at NEUTRAL)
• O L - 7 0 (sump oil temperature too low)
• O L - 7 9 (sump oil temperature too high)
• O L - 8 9 (output shaft rotation)
• O L - 9 5 (sender unit defective)
To exit, press either D, R, or N button.
Diagnostic Display Mode
Pressing a second time (or a first time if oil level
option not present) on the " " and " " keys will
select diagnostic display mode. Refer to Allison
WT troubleshooting guide for further information.
To exit diagnostic display mode, press either D,
R, N button, or up and down arrow keys at the
same time.
Operation
mode keeps
When a button is depressed, the corresponding
letter or number is displayed indicating the
transmission is ready to operate in the selected
range.
3-24
mode status will be indicated on the digital
display by a red LED illuminating in the upper
right corner of the MODE button when
selected.
(one quart low)
(two quarts low)
(one quart high)
(two quart high)
If one or more conditions are not met, an
(engine RPM too low)
When the electronic control system