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Duramax Diesel 6.6L Tap Shift Control by BD Diesel


                         DIESEL GEAR TOUCH CONTROL FOR 2001-2005 GM/CHEVY DURAMAX
                                                                       TOW/HAUL MODE

PURPOSE
-It is important to note that the customer may accidentally engage the tow/haul button and then comment about delayed or harsh shifts when not pulling a trailer or under heavy load. This is a Normal function of tow/haul mode when used in inappropriate conditions That may contribute to complaints that "cannot duplicate/no trouble found."
-Tow /Haul is a mode that will optimize gear selection for operation with heavy loads (such as towing):
1.Optimize acceleration performance for launches and rolling accelerations
2.It reduce shift cycling
3.Optimize braking performance and speed control during engine braking situations
4.Improve vehicle speed control while requiring less throttle pedal activity
-Because tow/haul mode maintains lower gears longer and increases shift pressures, it will degrade fuel economy and generate shift feel concerns if it is used inappropriately in unloaded driving conditions.
OPERATING TOW/HAUL
-Tow/Haul Tap Shift is selected or de-selected via a switch on the end of the transmission shift lever for all models. A light on the instrument panel will illuminate to indicate that tow/haul has been selected.
-Tow/Haul must be re-selected every time the vehicle is started (if desired).
FUNCTION
-Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating.
-Operation of tow/haul in a lightly loaded or non-loaded vehicle will not cause damage. However, there is no benefit to the selection of tow/haul when the vehicle is unloaded. The tow/haul switch is not a performance switch.
-Selection of tow/haul when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy, since up shifts occur at higher engine speeds. Tow/Haul is recommend only when pulling a heavy trailer or a large or heavy load.
-Automatic downshifting Normal Power-train Braking to assist speed control will activate when Tow/Haul mode is active and the brake pedal is depressed (even lightly). Downshifts are commanded at higher speeds than normal resulting in engine braking that assists with speed control. After a power-train braking situation ends, up-shifts will typically be commanded when the accelerator pedal is pushed down. a quick increase in accelerate pedal may be required.

http://www.toxicdiesel.com/p-2886-bd-diesel-tap-shifter-gear-control-01-02-duramax-trucks.aspx
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