Hard transmission shift
07-06-2012, 05:51 PM
#31
It sometimes "stumbles" into 4th gear when I'm slowly increasing speed. I also have the Lurching effect when I'm idling at around 5 mph. (maybe that's what is being brought up here. It kind of lurches when I touch the gas pedal. BTW, this is very annoying. I spoke with the dealers service manager and he just suggested a reflash. I don't see how that can fix anything, since it's my driving style that it learned on in the first place.
Toyota, on the other hand, has chosen to block any throttle plate response at these "happenstance" times until the "correct" gear ratio has been fully completed.
Not exactly a good feeling if you are expecting/require QUICK throttle response.
07-06-2012, 06:00 PM
#32
I just got mine back with a reflash, and the adaptive learning reset. The adaptive part of things sorta sucks. I use my truck for a lot of towing and hauling, and I would prefer it not bang out firm shifts when I'm puttering along. Really though, if it lasts a long time, I can live with it.
07-06-2012, 08:17 PM
#33
The adaptive learning isn't so much about your driving style as it is adjusting to the actual tolerances of the various components, inclusive of control components, within the transmission and to some extent the engine components.
When the vehicle exits the factory, or the memory is reset, the control parameters are reset to an engineering "best guess" insofar as the tolerances of various components, control "servos", and servo positional feedback elements are concerned. Generally within about 4 drive cycles, 200-500 miles, the firmware will have "learned", adapted, to all of the actual component tolerances, and stored the parameters that apply uniquely to your engine/transmission configuration.
Driving style "learning"....
Each time you start the engine and put the vehicle in motion the driving style "learning" begins with a blank slate. Within a few miles your driving style will be "binned" witinh 1 of 4 categories. Shortly thereafter it will be refined to within 1 of 16 categories. The system keeps continuous track of the way you drive and will adjust the "binning" accordingly, on the fly.
So you need not worry that your vehicle will learn/save something naughty, or nice, from the "other" driver.
When the vehicle exits the factory, or the memory is reset, the control parameters are reset to an engineering "best guess" insofar as the tolerances of various components, control "servos", and servo positional feedback elements are concerned. Generally within about 4 drive cycles, 200-500 miles, the firmware will have "learned", adapted, to all of the actual component tolerances, and stored the parameters that apply uniquely to your engine/transmission configuration.
Driving style "learning"....
Each time you start the engine and put the vehicle in motion the driving style "learning" begins with a blank slate. Within a few miles your driving style will be "binned" witinh 1 of 4 categories. Shortly thereafter it will be refined to within 1 of 16 categories. The system keeps continuous track of the way you drive and will adjust the "binning" accordingly, on the fly.
So you need not worry that your vehicle will learn/save something naughty, or nice, from the "other" driver.
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07-06-2012, 08:46 PM
#34
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The adaptive learning isn't so much about your driving style as it is adjusting to the actual tolerances of the various components, inclusive of control components, within the transmission and to some extent the engine components.
When the vehicle exits the factory, or the memory is reset, the control parameters are reset to an engineering "best guess" insofar as the tolerances of various components, control "servos", and servo positional feedback elements are concerned. Generally within about 4 drive cycles, 200-500 miles, the firmware will have "learned", adapted, to all of the actual component tolerances, and stored the parameters that apply uniquely to your engine/transmission configuration.
Driving style "learning"....
Each time you start the engine and put the vehicle in motion the driving style "learning" begins with a blank slate. Within a few miles your driving style will be "binned" witinh 1 of 4 categories. Shortly thereafter it will be refined to within 1 of 16 categories. The system keeps continuous track of the way you drive and will adjust the "binning" accordingly, on the fly.
So you need not worry that your vehicle will learn/save something naughty, or nice, from the "other" driver.
When the vehicle exits the factory, or the memory is reset, the control parameters are reset to an engineering "best guess" insofar as the tolerances of various components, control "servos", and servo positional feedback elements are concerned. Generally within about 4 drive cycles, 200-500 miles, the firmware will have "learned", adapted, to all of the actual component tolerances, and stored the parameters that apply uniquely to your engine/transmission configuration.
Driving style "learning"....
Each time you start the engine and put the vehicle in motion the driving style "learning" begins with a blank slate. Within a few miles your driving style will be "binned" witinh 1 of 4 categories. Shortly thereafter it will be refined to within 1 of 16 categories. The system keeps continuous track of the way you drive and will adjust the "binning" accordingly, on the fly.
So you need not worry that your vehicle will learn/save something naughty, or nice, from the "other" driver.
07-07-2012, 01:16 AM
#35
When the vehicle exits the factory, or the memory is reset, the control parameters are reset to an engineering "best guess" insofar as the tolerances of various components, control "servos", and servo positional feedback elements are concerned. Generally within about 4 drive cycles, 200-500 miles, the firmware will have "learned", adapted, to all of the actual component tolerances, and stored the parameters that apply uniquely to your engine/transmission configuration.
Driving style "learning"....
Each time you start the engine and put the vehicle in motion the driving style "learning" begins with a blank slate. Within a few miles your driving style will be "binned" witinh 1 of 4 categories. Shortly thereafter it will be refined to within 1 of 16 categories. The system keeps continuous track of the way you drive and will adjust the "binning" accordingly, on the fly.
So you need not worry that your vehicle will learn/save something naughty, or nice, from the "other" driver.
It is reluctant to let go of the aggressive shift strategy once implemented. The suspected cause of my rough shifts was a bunch of towing in the winter without using tow/ haul.
Last edited by isthatahemi; 07-07-2012 at 01:18 AM.
09-28-2015, 02:25 PM
#36
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Yes, that's pretty much SOP. It's due to the use of the relatively new coastdown FULL fuel cut used to improve FE with automatic transmissions.
During coastdown periods, gas pedal fully released, the engine is fully starved of fuel and sequential downshifting is used to keep the engine turning over in preparation for restoration of fuel flow. As your roadspeed delines below about 10MPH a final UPSHIFT is made just as full flow is restored. Consequentially the transmission downshift into 1st is often delayed until the vehicle has come to a full and complete stop.
During coastdown periods, gas pedal fully released, the engine is fully starved of fuel and sequential downshifting is used to keep the engine turning over in preparation for restoration of fuel flow. As your roadspeed delines below about 10MPH a final UPSHIFT is made just as full flow is restored. Consequentially the transmission downshift into 1st is often delayed until the vehicle has come to a full and complete stop.
09-30-2015, 07:52 PM
#37
Senior Member
I have had the lurh at low speeds but my 3rd to 4th upshift is way to hard, at least that's the only bad one.