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06-13-2009, 08:00 PM
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 What does the tow/haul switch really do? What does the tow/haul switch really do? Does it just change tranny parameters, shift points, shift firmness,etc Does it do anything to the engine? Just curious to learn from the knowledgable. thanks  |
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06-13-2009, 08:25 PM
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| Raises the shift points.
__________________ Any questions about truck mods I have done need to be asked in the forums. Don't send me a private message about mods cause I probably won't answer that PM unless there is money involved.   2007 SR5 Crewmax 5.7L 4x4 Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Cooper Zeon LTZ 275/60/20 tires, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, Weathertech floor mats All mod descriptions and pictures © 2007-2009 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only. |
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06-14-2009, 07:36 AM
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| Tow/Haul Control General During tow/haul control, the ECM controls the engine output, transmission shift schedule and shift timing to ensure drivability when a trailer is towed. The tow/haul control includes a throttle control, shift schedule control, wide open throttle shift timing control and AI-SHIFT control. The conditions required for tow/haul control to operate are as follows: - Shift position: D position (Tow/haul control does not operate in the S position). - TOW/HAUL pattern select switch: ON The TOW/HAUL indicator light is used to inform the driver that tow/haul control is operating. Throttle Control Throttle control changes the relationship between the accelerator pedal depression angle and the throttle valve opening angle. During tow/haul control, the throttle valve opening is increased by throttle control. As a result, acceleration performance is ensured. Shift Schedule Control The shift schedule control changes the upshift and downshift schedules during tow/haul control. For the upshift schedule, the upshift timing is changed to higher vehicle speeds, enhancing the use of lower gears. As a result, drivability is ensured. For the downshift schedule, the downshift timing is change to a wider throttle valve opening angle, enhancing the use of higher gears. As a result, the frequency of gear changes is reduced, allowing optimal shift quality. Wide Open Throttle Shift Timing Control Due to wide open throttle shift timing control, upshift timing is delayed to make use of high engine power Wide open throttle shift control operates in 1st, 2nd and 3rd during tow/haul control.when the accelerator pedal is fully opened.
__________________ 2007 Tundra DC Limited 5.7L 4X4 TRD,NAV,TOW Xlerator Exhaust aFe Stage 2 CAI BFG AT/KO 285/65/18 Desert Sand Mica |
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06-14-2009, 12:01 PM
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| I'd like to change my answer to what he said. |
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06-14-2009, 07:56 PM
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| Thanks thats the info I was looking for! |
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