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3rd Gen Traction Control Modes Explained

Discussion in '3rd Gen. Tacomas (2016+)' started by Doggman, Jan 25, 2018.

  1. Jan 14, 2019 at 3:01 PM
    #261
    St.Germain

    St.Germain TacomaKart

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    thanks very much it looks like i had it mostly correct in my head, but the hac & dac stuff is interesting, wonder what's going on there in different system configs.

    beside the point, but i totally agree regarding the driving side of it as you mentioned. my experience is systems are not as real world as they are designed to be, and resourcefulness & adaptability are the winning factors. i have stories myself that seem to turn all this reasoning on its head. anyway thank you again.
     
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  2. Jan 14, 2019 at 4:32 PM
    #262
    David K

    David K Well-Known Member

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    Like A-TRAC, DAC also makes some weird noises, too. The important thing is they both work great and Toyota gets an A for having them but an F for explaining them or promoting these great systems.
     
  3. Jan 14, 2019 at 4:33 PM
    #263
    St.Germain

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    so l can you answer definitively if the AT Off Roads have DAC built in? how about the MT's? this seems to be where things are unclear.
     
  4. Jan 14, 2019 at 6:04 PM
    #264
    tonered

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    What you have to realize is that most any vehicle with ABS effectively have most of this logic built in. The difference being is that the alphabet soup is applied without driver input. Whereas, if you are on a tricky decent or similar, just smoothly applying the brakes and letting the system brake the wheels will do 95% of the work. You just need to keep a level head.

    That said, separately, I did see MTS / CC extract an OR in wet snow.

    Regardless, the control of the MT even in my Sport more than makes up for the gizmo shortcomings for me.
     
    Last edited: Jan 15, 2019
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  5. Jan 14, 2019 at 6:25 PM
    #265
    David K

    David K Well-Known Member

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    I am only able to describe my truck operation as I am not a factory tech. As said above, DAC and ABS, A-TRAC, and other features share the hardware, such as the hydraulic brake booster (Off Road TRD 4WD models).

    My best guess is that CRAWL and DAC share the same things.
     
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  6. Jan 17, 2019 at 8:11 AM
    #266
    MI Yota

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  7. Feb 8, 2019 at 8:41 PM
    #267
    jls456

    jls456 Well-Known Member

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    Good info..
    Explains alot. Thanks.
     
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  8. Feb 9, 2019 at 4:36 AM
    #268
    billum v2.0

    billum v2.0 Well-Known Member

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    For someone who's had 4 wheel drive trucks for thirty years, this thread illuminates just how far these systems have come. Hard to get my head around all the options for specific terrains.

    As someone new to Toyota, the first page is an excellent "how to" reference. Does a much better job explaining the intended purpose of the individual systems and how they play together.

    Thanks Doggman, appreciate your work.
     
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  9. Feb 10, 2019 at 6:52 AM
    #269
    Imugi79407

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    On a 460 anyway DAC is more or less a crippled version of CRAWL. The big difference being that CRAWL works both the brakes and accelerator while DAC only does brakes. On either system it is working all the brakes independently in ways a human really couldn't.

    In converting to Crawl on a 460 it would appear you are just selecting a different profile in the ABS Skid ECU and using some different pins on the center console switch and connector in interacting with that ECU.

    '08-'11 Land Cruiser and LX 570 had 3 speed crawl while 5 speed crawl was added to '13+ models. 4R crawl was 5 speed as well in 2010+ and FJ crawl showed up in certain package in 2013.

    Crawl speeds are roughly 1-5 MPH over the 5 speed selection. I thought I read in some technical documentation the speeds are slightly more or less at each selection but can't find that data at the moment. DAC is fixed at around 3 MPH and of course only downhill.


     
    Last edited: Feb 10, 2019
  10. Feb 25, 2019 at 4:43 PM
    #270
    sdfuller88

    sdfuller88 Well-Known Member

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    tracoff, vsc Long push doesn't work for me in 2wd on my 2018 sr5 4x4. I tried it and there is no difference between the short press. Slip indicator still comes on and throttle is modulated. Any ideas?
     
  11. Feb 25, 2019 at 5:10 PM
    #271
    BigWhiteTRD

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    Are you long press at a full stop?

    Please provide pictures or exact symbols shown at short and long press.

    Are you getting 'auto lsd' are you getting 'trac off' light ?
     
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  12. Feb 25, 2019 at 10:31 PM
    #272
    sdfuller88

    sdfuller88 Well-Known Member

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    So today

    So today after work I was stopped at a light, in drive, and held it for maybe 5 secs and I got trac off. I honestly have no clue why it didn't work before since I was holding it for 10-15 secs and no change. The only difference was that day there was snow on the roads and the traction control kept kicking in. I'm 99% sure I was completely stopped when I tried it as I was in the cul-de-sac. I wonder if there is a cool down period or something if you were just recently slipping? Who knows, maybe I wasn't completely stopped or I had it in neutral (don't know why that would matter.) I'll try and recreate it next time it snows. For now well just chalk it up to a fluke.
     
  13. Feb 25, 2019 at 10:32 PM
    #273
    sdfuller88

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    Also I just hit 5k miles and reset my maintenance light so maybe that had something to do with it?
     
  14. Apr 28, 2019 at 9:10 PM
    #274
    Cav_BluTRD

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    Wait, so can MTS and CC can be enabled at the same time?
    According to the chart it can.. has anyone tried this?
     
  15. Apr 29, 2019 at 4:35 AM
    #275
    BigWhiteTRD

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    Yes.
    Yes (but not on terrain, so I didnt figure out if there is a difference).

    I dont remember details about it any more (stupid getting old sucks), but take a look at this post, and the next few by me after this one...

    https://www.tacomaworld.com/threads...l-modes-explained.530695/page-7#post-17023370

    Truck definitely has CC with MTS on and CC with MTS off, but I didn't figure out if they actually do anything different. I dont think they do... I think it is just the ECU remembering your MTS selection for the moment. To get the two modes, you have to first have MTS on or off, then turn on CC. Once CC is on, you cant change the MTS.
     
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  16. Apr 29, 2019 at 7:22 AM
    #276
    Cav_BluTRD

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    Cool! Thank you!
     
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  17. Apr 29, 2019 at 8:18 AM
    #277
    BigWhiteTRD

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    NP
    So just to clarify, when CC is on with the MTS OFF, I know that the truck is certainly braking the free wheel.
    I don't know if MTS ON, CC ON produces any more agressive results, but I doubt it.
     
  18. Apr 29, 2019 at 10:10 AM
    #278
    Cav_BluTRD

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    I want to try all this now. I have yet to use my CC or MTS. In fact...
    I haven’t even had the truck in 4lo yet
    :anonymous:
     
  19. Apr 29, 2019 at 4:05 PM
    #279
    David K

    David K Well-Known Member

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    Just to provide some sort of benchmark, to see which drive mode gets the truck further, what I did was go to the base of a steep pitch up (side of a desert hill), sort of a sand dune/ dry mud hill.

    From a dead stop, I climbed up as far as the truck would go in each of the drive modes. A colored marker flag can be helpful. Once tires spun or the engine could not move the truck further, I marked the point or noted the tire track position. I did not drive repeatedly over the same track since it was compacted by the truck's weight. The A-TRAC and A-TRAC + locker were pretty identical for being the best at climbing. Of interest H4 (with TRAC or TRAC OFF as it was called in 2012) outclimbed L4. This was proof at how improved traction control was over open differentials without traction control even in low range.

    For me (as a 2010 owner) personally, the biggest mystery is:
    1) The difference between TRAC and TRAC OFF in H4 (2012+ 2nd, & 3rd Gen)
    2) Is there TRAC or TRAC OFF in L4 (3rd Gen).

    In H2, we are normally in TRAC and need to press the button for AUTO LSD (also called TRAC OFF for 2nd Gen) to enhance the limited slip system, making it stronger.
    My logic is that when TRAC OFF was added to H4, it would have the same enhancement? TRAC was limited slip with engine regulation and TRAC OFF (AUTO LSD in H2) was limited slip with the regulation turned OFF.

    So, young grasshoppers, go to the base of a steep climb and compare H4 TRAC to TRAC OFF. Then compare the MANY potential L4 modes, especially if you have the Off Road TRD... The 2nd Gens have no traction control in L4 except for the Off Road's locker and A-TRAC. The other models did a wire mod to trick the computer to give TRAC in L4.

    *Standard L4 (no button push, what lights are on?).
    *L4 quick push (does any light come on?).
    *L4 long press (does any light come on?).
    *MTS/ A-TRAC
    *CRAWL
    *MTS & CRAWL
    *Rear Locker
    *Rear Locker & MTS
    *Rear Locker & CRAWL
    *Rear Locker, MTS, & CRAWL
     
  20. May 8, 2019 at 11:28 PM
    #280
    Kauai_Tacoma

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