Chassis Information --- Section 10
The Executive 2005
491
The range selection is accomplished via the remote push button selector. The controls are R, N, D,
arrow UP, arrow DOWN, MODE button and a digital display window. Under normal operation
press the D button and the digital display shows the highest forward range attainable for shift selec-
tion in use. The digital display window will also indicate codes for abnormal conditions, and can even
be a useful troubleshooting aid. When the ignition is turned ON, the display should be visible. This display
indicates the presence of neutral start command. If the display indication is not visible, there is no
power to the selector and the transmission will not allow the engine to start. This is an indicator of
electrical problems with the engine batteries or ECU on shift selector keypad.
The window displays gear selection, various transmission modes, oil level and transmission fault
codes.
Keypad Functions:
• Select the REVERSE gear by pressing R.
• Select NEUTRAL by pressing N. The area
around the N button has 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 high-
est forward gear appears in the display and the trans-
mission will shift to first gear though 6 is displayed.
• 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 NEU-
TRAL or REVERSE. One press changes the gear range selected by one. 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 enables a secondary shift point to be selected. This is commonly
referred to as Economy. It is further used by the service technician to access diagnostic
codes when troubleshooting. The diagnostic circuitry must be enabled to display.
• When the Auxiliary Braking device (Jacob brake) is used, the display changes to a default
reading of 2 or 3. This default is pre-selected at the factory and can only be repro-
grammed by an authorized Allison Service Center. The transmission is not in second or
third gear. This is only a reference for the transmission downshift points to optimize the
engine braking effect.
• Engine temperature may rise when ascending long grades using full throttle. Towing a load
will increase the demand on the engine. If this occurs, manually shift the transmission
down to the next lower gear and use less throttle. The engine will use less fuel and RPM
should increase.
NOTE:
The transmission will not accept a manually selected gear change to occur if the
gear selected is out of the specified operating range.
NOTE:
The transmission will not shift into gear from Neutral if the engine RPM is at or
above 900. The display will flash “6” indicating the engine RPM is excessive.
Select “N” and lower the engine RPM.
020168C
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