Operating Instructions, 2100 Series (Arens SBW)
General Information
The Arens shift-by-wire (SBW) push-button shift selector is part of an electronic shift control system used with Allison series 2100 5-speed automatic transmissions. An electronic actuator is mounted to the transmission.
The 2100 series transmissions have a park pawl and the SBW selector has a Park (P) position. See Fig..
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SBW Shift Selector
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Drive (D) Button
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Neutral (N) Button
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Reverse (R) Button
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Park (P) Button
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Select Display
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Select/Monitor Display Window
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Monitor Display
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Service Display
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Mode Function Label
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Mode Indicator LED
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Mode Button
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Upshift Button
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Downshift Button
Fig. 1, SBW Shift Selector (2100 series)
In case the vehicle needs to be towed and the SBW system cannot be activated to move the transmission out of Park (P), a manual procedure is provided to shift the transmission. At the actuator, on the transmission, a port is provided to insert an Allen wrench to shift the transmission manually. See Removing the Transmission from the Park (P) Position for more information.
At the top left side of the selector, is the select display. On the left side of the display window, an LED character indicates which gear has been selected.
At the top right side of the selector, is the monitor display. On the right side of the display window, an LED character indicates which gear is actually engaged.
Warning: Always place the transmission in the Park (P) or Neutral (N) position and set the parking brake before releasing the service brakes and exiting the vehicle. Otherwise the vehicle could move unexpectedly and cause an accident, possibly resulting in personal injury and property damage.
P (Park)
The Park (P) button shifts the transmission to Neutral (N) and engages the park pawl. When Park (P) is selected, the monitor side of the display window will show a letter P.
Important: If the ignition switch is turned to the OFF position before selecting Park (P), a buzzer will sound and the monitor display will show the gear that is currently engaged. Select Park (P) to turn off the buzzer and the display. Also, with the engine not running (ignition switch in the ON position and park pawl not engaged), a buzzer will sound and the monitor display will show an N for Neutral (N). Select Park (P) to turn off the buzzer and the display.
R (Reverse)
Select the R button to place the transmission in Reverse (R). An R will appear on both sides of the display window.
N (Neutral)
Warning: Do not leave the vehicle if the transmission is in Neutral (N) without first setting the parking brake. The vehicle could roll or move unexpectedly and cause an accident, possibly resulting in personal injury and property damage.
Select the N button to place the transmission in Neutral (N). An N will appear on both sides of the display window. The vehicle may be started in Neutral (N).
D (Drive)
Select the D button to place the transmission in Drive (D). The transmission will automatically shift through the full range of First (1) through Fifth (5) gears. When Drive (D) is first selected, the display will show D1, indicating that Drive (D) was selected and that First (1) gear is engaged. As the transmission automatically upshifts and downshifts, the display will show the gear currently engaged (D1, D2, D3, D4, or D5).
Upshift/Downshift Buttons
With the transmission in Drive (D), select the downshift (down arrow) button to manually downshift one gear at a time, from Fifth (5) to First (1). The select display will show the selected gear and the monitor display will show the gear currently engaged. From D5 at the top of the Drive (D) range, the display will show 44, 33, 22, and 11 as progressively lower gears are manually selected.
Note: The transmission will remain in the manually selected gear until Drive (D) is selected. Select Drive (D) at any time during the manual downshifting sequence (or upshift progressively to Drive [D] using the up arrow button) and the transmission will upshift and downshift automatically.
With the transmission in 11, 22, 33, or 44, select the upshift (up arrow) button to manually upshift one gear at a time until Drive (D) is selected. The select display will show the selected gear and the monitor display will show the gear currently engaged. From 11 at the bottom of the Drive (D) range, the display will show 22, 33, 44, and D5 as progressively higher gears are manually selected.
Note: The transmission will remain in the manually selected gear until Drive (D) is selected. Select Drive (D) at any time during the manual upshifting sequence and the transmission will upshift and downshift automatically.
Mode Button
The function of the mode button may vary from vehicle to vehicle. The label above the button identifies the function.
Mode Indicator LED
A light in the upper right-hand corner of the mode button illuminates when the mode function is active.
Service Display
Important: An illuminated service display may indicate a loss of safety back-up systems. Use extra care when shifting to ensure that the transmission is operating properly.
The service display illuminates if a fault is detected in the SBW system. Have a qualified technician inspect the SBW system as soon as possible.
Select/Monitor Display
A flashing select/monitor display indicates that the transmission (and not the SBW system) has inhibited a selected transmission operation. See the Allison Transmission Operator's Manual for more information.
Calibrating Arens SBW
If the vehicle shuts down in gear and will not start, check the two 10-amp fuses. Then check to see if either one or two Ns appear on the transmission shifter and the vehicle will not start. To reset the transmission shifter, turn the ignition to the ON position. On the transmission shifter, go through the following sequence of N-R-N-D-N. This should reset the shifter and allow the vehicle to start.