forward range attainable for the shift selection in use. The digital display window
will also indicate codes for abnormal conditions, and can even be a useful trou-
bleshooting aid. When the ignition is turned ON, the display should be visible.
This display indicates the presence of neutral start command. If this display indi-
cation is not visible, there is no power to the selector and may indicate electrical
problems with the batteries.
• Digital display window enables information requested to be easily read.
• Select the Reverse gear by pressing “R”.
• Select NEUTRAL by pressing “N”. The area around the “N” button is a
raised ridge so the driver can orient his hand to the push buttons by touch,
without looking at the display.
• 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.
• The UPSHIFT and DOWNSHIFT arrow buttons are used to select a higher
(if not in “D”) or lower (if not in “1”) forward range. These buttons are not
functional in NEUTRAL or REVERSE. One press changes the range
selected by one range. If the button is held continuously, the selected range
will continue to change up or down until the button is released or until the
highest/lowest possible range of gears is selected.
• The MODE button will enable secondary shift point to be selected. This is
commonly referred to as “Economy”. It is further used by the service tech-
nician to access diagnostic codes when troubleshooting. The diagnostic cir-
cuitry must be enabled to display.
The electronic control system is programmed to inform the operator of a
problem with the transmission system and automatically take action to protect
the operator, motorhome and transmission. When the Electronic Control Unit
(ECU) detects a DO NOT SHIFT (DNS) condition, the ECU restricts shifting,
turns the CHECK TRANS light on the instrument panel and registers a diagnos-
tic code.
NOTE: For some problems, diagnostic codes may be registered without the
ECU activating the CHECK TRANS light. Your Allison Transmission
authorized service outlet should be consulted whenever there is a transmis-
sion related concern. They have the equipment to check for diagnostic codes
and to correct problems which arise.
Each time the engine is started the CHECK TRANS will light, then turn off
after a few seconds. This momentary lighting is to show that the status light cir-
cuits are working properly. If the CHECK TRANS light does not illuminate dur-
ing start up, or if the light remains on after start up, the system should be
checked immediately.
Continued illumination of the CHECK TRANS light during vehicle operation
(other than start up) indicates that the ECU has signaled a diagnostic code.
Chassis Information
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EXECUTIVE7•229
Check Trans Light
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