User Manual

Table Of Contents
keep the engine within the proper speed
range or to obtain the maximum engine
brake performance.
Reverse
If the R button is chosen, the vehicle will
also be immediately set in motion. In this
case, too, first depress the brake pedal and
then select R.
Mode
The Mode button can allow the driver to
enable a secondary shift schedule, PTO
enable, or other special functions that have
been programmed into the ECU unit at the
request of the OEM. For example, a
vehicle OEM may have provided a
secondary shift schedule for improved fuel
economy. The name of the special function
(ECONOMY) appears on the MODE ID
label adjacent to the Mode button.
Pressing the Mode activates the
ECONOMY shift schedule and illuminates
the Mode indicator LED. When the
Diagnostic Display Mode has been
entered, the Mode button is used to view
and toggle through diagnostic code
information. The code displayed is active if
the Mode indicator LED is illuminated.
Up Arrow
Press the Up Arrow when in "D" (Drive) to
request the next higher range. Continually
pressing the Up Arrow will request the
highest range available.
Down Arrow
Press the Down Arrow when in "D" (Drive)
to request the next lower range.
Continually pressing the Down Arrow will
request the lowest range available.
Faults
If the transmission fault warning symbol
lights up in the master display, a fault has
been detected in the gearbox.
Read the following recommendations first
or consult an authorized dealer if
necessary.
Gearbox
The ECU will block the functions of the
selector buttons to ensure that the gearbox
will select a "safe gear". It is important to
drive the vehicle to a safe place as soon as
possible and switch the ignition off. It will
no longer be possible to shift the gearbox
to neutral. The ECU will prevent this.
After approximately 30 seconds, try
starting the engine again and engaging a
gear. If the fault is one whereby the
gearbox must in no circumstances be
shifted, the ECU will no longer shift the
gearbox. Driving is therefore no longer
possible!
If the fault is one whereby the gearbox may
still be shifted, the warning in the main
display will disappear. The ECU will have
recorded the fault as an inactive fault.
It is now possible to drive the vehicle
again, though the fault will still need to be
remedied.
DRIVING - Allison Automatic Gearbox
Y53-6078-1B1 (12/18/18) 93
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