General Information
The Arens shift-by-wire (SBW) push-button shift selector is part of an electronic shift control system used with Allison series 2100/2500 5-speed automatic transmissions. An electronic actuator is mounted to the transmission.
The 2100/2500 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 Light
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Mode Button
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Upshift Button
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Downshift Button
Fig. 1, SBW Shift Selector (2100/2500 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.
Calibrating Arens SBW