Programming – AT/MT/HT Part Throttle Shift Speed

Description:
The AT/MT/HT Part Throttle Shift Speed parameter provides the ability to change the shifting characteristics in vehicles equipped with non-data link capable Allison transmissions. The Allison AT/MT/HT (nonelectronic) transmissions require an input from the engine ECM to regulate transmission shifting. The ECM monitors accelerator pedal position, engine speed, load, and cruise control status to determine if the transmission should use closed throttle or full throttle shift modulation.

Programming the Transmission Style parameter to one of the AT/MT/HT options activates ECM Output #7 (J1/P1:20) to control a shift interface relay connected to the transmission. The ECM can then energize the output when the transmission should use full throttle modulation (performance mode) or disable the output when the transmission should use closed throttle modulation (economy mode).

Available:
3126E, C7, and C9 medium duty engines

Range:

Advantages:
This parameter provides additional control over shifting characteristics of the non-data link capable Allison transmissions. This additional control enables a driver to optimize the transmission’s behavior depending upon the specific application.

Disadvantages:
None

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