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Transmission Down-Shifting on it's own !!

Discussion in '2nd Gen. Tacomas (2005-2015)' started by DocTaco, Oct 12, 2011.

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  1. Oct 12, 2011 at 5:01 AM
    #1
    DocTaco

    DocTaco [OP] Member

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    I had this happen a couple of times, coasting down a incline at around 45mph. The transmission would down shift a couple of gears and motor would be reved to around 4000 rpm. I took it to the dealer for 15K service the next week, they checked it out , said no problems found. Well within a week it did it again, this time around the same speed but it down-shifted the instant I touch the brake to keep from exceeding the speed limit to much. I let it go just to see how or what it would do. Well it stayed at 4k rpm for a good 1/2 mile. I finally applied some power and it up shifted back to normal. So has anybody else ran into this un-needed and un-explained down-shifting.

    2011 TRD V6 Tow Pkg
     
  2. Oct 12, 2011 at 5:07 AM
    #2
    TnRedNeck721

    TnRedNeck721 GO VOLS!

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    i’ll go ahead and ask auto or manuel thans?

    edit: i’m going to assume it’s auto. and i have not had this happen.
     
  3. Oct 12, 2011 at 5:15 AM
    #3
    crazyengineer

    crazyengineer Well-Known Member

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    I have no idea what it is doing, but just a though, i drop gears in my manual when going down hill to control my speed, could this have something to do with it?

    I have never used the auto before, so i dont know
     
  4. Oct 12, 2011 at 5:17 AM
    #4
    AndrewFalk

    AndrewFalk Science!

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    :)
    You have an auto so it does ALL it's shifting on it's own. :p

    But the case you described doesn't seem right. Unless the auto's in the Tacoma like to do some serious engine braking.
     
  5. Oct 12, 2011 at 5:20 AM
    #5
    TacoCat

    TacoCat Look away, I'm hideous!

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    is there a tranny reflash tsb for the 2011's?
     
  6. Oct 12, 2011 at 5:20 AM
    #6
    fletch aka

    fletch aka www.BeLikeBrit.org

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    My 09 does the exact same thing.
     
  7. Oct 12, 2011 at 5:23 AM
    #7
    hendooman

    hendooman The Stroker Ace

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    it is normal, especially on a new vehicle. there is a lot of talk on TW about it, it seems to be really noticeable on a new vehicle, I think that as something to do with the ecu learning your driving habits. I am almost to 30K and it either doesn't do it anymore or I don't notice it. I can't believe the tech at Toyota didnt know it was normal....
     
  8. Oct 12, 2011 at 5:43 AM
    #8
    puckstopper55

    puckstopper55 Well-Known Member

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    Downhill Assist control?
     
  9. Oct 12, 2011 at 5:45 AM
    #9
    Flyfisher22

    Flyfisher22 Well-Known Member

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    Yep my 2011 does it. I do a lot of mountain driving and kind of like it now. Just tap the brakes and the engine will shift to control your descent.
     
  10. Oct 12, 2011 at 9:16 AM
    #10
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    It's called engine braking , it's not a malfunction , is normal and beneficial
     
  11. Oct 12, 2011 at 9:19 AM
    #11
    RightYouAreKen

    RightYouAreKen Well-Known Member

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    Yep, same here. Keeps me from having to ride my brakes.
     
  12. Oct 12, 2011 at 9:20 AM
    #12
    Fink

    Fink Motorboatin' SOB

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    Bingo.

    And for reference purposes...

    http://www.toyota.com.au/glossary

    Fink[​IMG]
     
  13. Oct 12, 2011 at 9:21 AM
    #13
    CorrosiveTendency

    CorrosiveTendency When up to your nose in shit, keep your mouth shut

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    My '05 will drop down one gear on a decline when off the gas and I tap the brake. But never more than one gear.
     
  14. Oct 12, 2011 at 9:24 AM
    #14
    D13

    D13 Well-Known Member

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    not so beneficial if you want to coast, almost avoided toyota alltogether after renting a camry that did it really bad
     
  15. Oct 12, 2011 at 9:25 AM
    #15
    Fink

    Fink Motorboatin' SOB

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    Neutral? :p

    Fink[​IMG]
     
  16. Oct 12, 2011 at 9:26 AM
    #16
    OffroadToy

    OffroadToy This ain't Dodge City, and you ain't Bill Hickok

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    You can't operate the DAC unless your in 4LO.
     
  17. Oct 12, 2011 at 9:28 AM
    #17
    arrrghhh

    arrrghhh Well-Known Member

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    Gawd I'm sooooo glad I have a 6spd...

    I can choose which gear the truck is in. Crazy!!!
     
  18. Oct 12, 2011 at 9:35 AM
    #18
    DocTaco

    DocTaco [OP] Member

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    Yep, I would call it the down-hill engine braking. I had tried the DAC but was only in 2wd so it did nothing. If it is the braking effect , then it works good. I stayed right at 40-45 all the way to the bottom, the only way it would return to norm was to apply a little engine power then it would shift up and continue. Regarding the 2 gear downshift, i just assumed it was since it went from 2200 rpm to 4000 when it downshifted. That is more than just dropping from OD, it dropped from OD and shifted down a gear. But bottom line is that it seems nothing is out of the ordinary per your guys posts.
    Thanks,
     
  19. Oct 12, 2011 at 9:35 AM
    #19
    GTABurnout

    GTABurnout Well-Known Member

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    My low milage 07 does the same thing. I was allittle worried at first. But seems like it helps on long decents, where I would normally manually shift in to lower gears to control speed.
     
  20. Oct 12, 2011 at 9:40 AM
    #20
    ForeRunner

    ForeRunner Scotch before noon. Moderator

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    It is actually an adaptive transmission. There are on the FJ Cruisers, 4Runners and the Tacomas. It learns your driving style and as you coast down a hill if you usually brake it will sense this and attempt to duplicate it. I notice it all the time in my 4Runner. If you go to Toyota and select the FJ Cruiser there is an informative flash video on the transmission.
     
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