Pushbutton Shift Selector - Allison Transmission 3000 MH Series Owner's Manual

the digital display are illuminated for more than 12 seconds, the ECU did not
complete initialization. When the digital display is blank, there is no power to the
selector. When the display shows a " " (cateye), a selector-related fault code has
been logged. Conditions which illuminate the CHECK TRANS light will disable the
shift selector and the digital display will show the range actually attained. See
Page 16 for detailed explanation of the CHECK TRANS light. The transmission will
not shift into range if a CHECK TRANS code is active. When the display shows
either R or D has been requested and the display is flashing, the requested range has
not been achieved due to an inhibit function. Some inhibit functions are vehicle-
related and will not result in diagnostic codes. Some examples are mentioned in the
Range Selection section which follows. Check for active codes if no other inhibit
function has been located. Refer to the DIAGNOSIS section for information on
accessing codes using the shift selector. Once is attained, the transmission
D (Drive)
will shift into the lowest range programmed for the position, usually first.
D (Drive)
Display Mode/Diagnostic Button. Allows access to optional fluid level check
information and diagnostic code information. Press the display mode/diagnostic
button once to obtain transmission fluid level information (when oil level sensor is
present) and a second time to obtain diagnostic code information.

PUSHBUTTON SHIFT SELECTOR

General Description . The pushbutton shift selector has R, N, D, , , a MODE
button, and a digital display.
R Pushbutton . Press this button to select Reverse.
N Pushbutton . Press this button to select Neutral.
D Pushbutton . Press this button to select Drive. The highest forward range available
will appear in the digital display window. The transmission will start out in the
lowest available forward range and advance automatically to the highest range.
, (Arrow) Buttons . When a lower range is desired, after D (Drive) has been
pressed, press the (Down) arrow button until the desired range is shown in the
display window. Likewise, if the transmission is held in a low range by the
(Down) arrow, press the (Up) arrow to request the next higher range.
Continuous pressing of either the (Up) or (Down) arrow buttons will request
the highest or lowest range available.
Access fluid level data and diagnostic codes with the pushbutton selector by
pressing the (Up) and (Down) arrow buttons at the same time. Refer to
Page 29, FLUID LEVEL CHECK USING THE PUSHBUTTON OR LEVER
SHIFT SELECTOR, or Page 41, DIAGNOSIS for further information. Fluid level
information is displayed (if optional oil level sensor is present) after the first
simultaneous press. Press both buttons again to obtain diagnostic data.
MODE Button and Digital Display . Same function as described in the lever
selector above.
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