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3rd Gen Traction Control Modes Explained

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

  1. Jul 7, 2019 at 1:03 PM
    #301
    PB FAB

    PB FAB Well-Known Member

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    Base model SR - no A-TRAC.
     
  2. Jul 7, 2019 at 3:21 PM
    #302
    splitbolt

    splitbolt Well-Known Member

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    Right...because it requires the hydraulic brake booster...or does it?
    My thought is, it just requires 4-channel ABS. A-TRAC would just be more effective with it's[hydraulic] increased braking power.

    Not to rely too heavily on the FSM, but it does indicate 'A-TRAC control active' as one indicator of the slip indicator light blinking; for vacuum boosted 4wd.

    What about FJs and 4Rs with A-TRAC; all hydraulic boost?

    I wish we could pick Nishimura's brain...
     
  3. Jul 7, 2019 at 4:58 PM
    #303
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    The results observed by @PB FAB matches what we had previously found precisely and is represented in the spreadsheets. In fact I believe the PB FAB actually contributed to the data we have. On the SR, in 4Lo the default behavior (no button presses) is:
    TRAC ON, VSC OFF
    (you wont see any lights for the TRAC ON on the dash, until the system decides to react).
    You get the VSC OFF to indicate that stability control is off. Stability Control is separate from the Traction Control

    When TRAC operates you get the squiggly.
    The VSC OFF light is 'squiggly' with an 'OFF'

    PB FAB 4Lo.jpg

    Note, TRAC operates with the standard vacuum brake booster.
     
    Last edited: Jul 8, 2019
  4. Jul 7, 2019 at 5:21 PM
    #304
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    There are (2) options for the SR/SR5/Sport/Limited in 4Lo.
    TRAC ON, VSC OFF (Default)
    TRAC OFF, VSC OFF (Long Press VSC Button)

    Here are the Dash indications you get for the two modes.
    Notice, when the TRAC OFF light is On, then there is NO traction control.
    4Lo Dash Lights.jpg
     
  5. Jul 7, 2019 at 9:43 PM
    #305
    David K

    David K Well-Known Member

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    Correct, only the hydraulic brake booster can fully stop the spin to match rotation with the traction tire on each axle.
     
  6. Jul 20, 2019 at 1:28 AM
    #306
    H3llRid3r

    H3llRid3r Well-Known Member

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    OK, finally finished reading this thread. Great info.

    However, I still haven’t figured out what the difference is between MTS and CRAWL. With MTS I can select the terrain and with CRAWL I can select the speed. Any other differences?

    Also, if both these modes simulate a locker, is there really a need to have either mode selected with the locker engaged?

    So far, I’ve only used 4LO and the locker and have been able to do anything I’ve wanted to.

    The one time I wanted to try the different modes I had damaged the drivers side ABS sensor and all hell broke loose. Had a hell of time getting the rear locker to engage. All others systems were kaput.

    FCA2DADA-173F-4172-B0E2-A38C9D805603.jpg
     
  7. Jul 20, 2019 at 6:28 AM
    #307
    tonered

    tonered tacorider

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    Roughly, MTS controls the amount of TRAC force applied. CC is offroad cruise control in 1mph increments. You use them in combination when stuck.

    The systems are voodoo and work well with less abuse to the driveline. I saw it with my own eyes when I was stuck in the same snowy incline as an OR. I was able to work my way out. The OR could not until MTS / CC was engaged. Then, it just walked free effortlessly.

    Also, there are a couple companies that make shields for the ABS sensors. If you can't find the threads, lemme know and I will see if I can dig them up.
     
    Last edited: Jul 20, 2019
    David K likes this.
  8. Jul 20, 2019 at 7:18 AM
    #308
    David K

    David K Well-Known Member

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    I have owned three 4WD Tacomas with the locker. The third one had A-TRAC (=MTS, without terrain settings). I discovered that A-TRAC was more able than the locker because it controls slip/ traction on the front and the back. The locker only does so on the back. You also cannot steer easily with the locker on.
    I used A-TRAC and no locker everywhere I needed the locker on my previous two Tacomas, and A-TRAC was the champ.
    Only in the snow did I think the locker on WITH A-TRAC on did well or better than A-TRAC alone (for low range conditions). The reason is that with the locker on, A-TRAC only activates under 3 mph, i.e. when you are stuck or almost stuck. At that point, A-TRAC works the front tires with locker-like traction assist. You need some tire spin in snow (unlike in sand or rocks) and A-TRAC won't let you spin the tires. So adding the locker automatically de-activates A-TRAC over 3 mph. Perfect!
    Except in snow*, I recommend you use the MTS and never again the locker, except (as Toyota recommends) only in an emergency, if MTS/A-TRAC fails to get you out or over a road.

    *MTS may have a snow setting that allows some tire spin? If yes, then no locker.
     
    tonered likes this.
  9. Jul 20, 2019 at 1:09 PM
    #309
    H3llRid3r

    H3llRid3r Well-Known Member

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    Thank you for the explanation.

    I’ve since purchased SDHQ’s ABS guards. However, the funny thing was that the ABS itself wasn’t damaged, it was the wiring harness. The dealer said it was pulled out of its socket.

    OK, so would I use MTS and/or CRAWL instead of the locker while off-road?

    BC2038E1-6984-42F9-80E0-2E8929E1901C.jpg
     
  10. Jul 20, 2019 at 2:53 PM
    #310
    David K

    David K Well-Known Member

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    ALWAYS!
    Never be in low range without MTS on... or A-TRAC on.
    CRAWL is just a 'cruise' control for crawling or dropping down steep, rocky grades or getting unstuck.

    You paid extra for the Off Road TRD to have its advantages over all other stock Tacomas.
    MTS (A-TRAC) is locker-like traction on ALL 4 tires, not just the back. You can steer better without the locker on, too.

    The locker is for emergency only (per Toyota), so keep it in the 'back pocket' if MTS doesn't do it. Please practice and learn how each traction choice works before being alone somewhere far from help.
     
    D-FENS and Cav_BluTRD like this.
  11. Jul 20, 2019 at 7:09 PM
    #311
    H3llRid3r

    H3llRid3r Well-Known Member

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    Roger. Thank you for clarifying and point taken. I did pay extra so I’ll just have to experiment and learn The different modes.

    I’ve just gotten used to the 4LO and locker combination. Old school, I suppose.
     
    David K and tonered like this.
  12. Aug 7, 2019 at 7:52 AM
    #312
    SnowB

    SnowB Well-Known Member

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    There is an almost confusing amount of options! I think someone should be a boss and add an example of what to use when.
     
  13. Aug 7, 2019 at 7:58 AM
    #313
    tonered

    tonered tacorider

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    That is up to you to decide. This thread is just an explainer.

    Go out and test to see what works for you. Posting any kind of guide like that on TW is likely to start a war of a thousand shitposts.
     
  14. Aug 9, 2019 at 9:20 AM
    #314
    @theofficialtre

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    How often does anyone's TRAC yell? I feel like mine comes up far too often. I drive easy and slower than most, but it makes noises at me at seemingly any light motion that is more than regular road bounce. Whether it is coming out of a parking lot to the street (so a small grade) or forest/washboard roads. It tends to be from the front end having trouble, rather than the back.

    The pickup is on Bilstein 5100's up front and a 1" block out back.
     
  15. Aug 9, 2019 at 9:28 AM
    #315
    tonered

    tonered tacorider

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    I don't remember much from my Sport in its early days since the stock tune (04B12) didn't really hook up well at low speeds and I had the sway bar off quite soon. Now, it will light up on just about any uneven bumper or hard corner in the lower gears. It is usually the rear inside tire losing traction as expected, esp with the increased body roll.

    Although, I don't think that I ever had TRAC trigger from something up front unless I was on some low traction surface playing around. It doesn't look like you are on the stock tires, but the Toyos just seem to be like that. My hope is for more wet and dry stick when I swap mine out.
     
  16. Aug 9, 2019 at 9:42 AM
    #316
    @theofficialtre

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    I have been wanting to take off my sway bar, no reason that I haven't. So maybe I will get that done and see how that helps. The light coming on, I can reason with that especially in the low speeds and corners, but making a grinding noise seems excessive to me. The tires are 285/70/17 Patriot MT's.
     
  17. Aug 9, 2019 at 9:56 AM
    #317
    tonered

    tonered tacorider

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    The ABS pump is mounted on the right wheel well just in front of the firewall, so you are going to hear and feel it in the cab. I've had some cars where the pump is nearly silent and some that were louder than the Taco. The sound itself is very normal.

    Given the stiff Sport springs and shocks, the sway bar delete (SBD) was perfect for me on and off road. Since, I have tested it thoroughly for myself and had a couple unexpected swerves. Zero issues for me.

    I had a drive in an OR and feel the stock suspension was great on road with the sway bar. The feel is completely different between them. My only remaining complaint about the Sport suspension is the wiggle from the rear hangers. I'll reinforce or swap those someday.
     
  18. Aug 9, 2019 at 10:07 AM
    #318
    David K

    David K Well-Known Member

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    Did you have the alignment checked and adjusted after adding new suspension? 5100's up front are height adjustable, so did you raise the front with them set above stock? That may cause the VSC/Trac sensors to go off...?
     
  19. Aug 9, 2019 at 10:09 AM
    #319
    @theofficialtre

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    I did have the alignment taken care of and raised the front up.
     
  20. Aug 9, 2019 at 5:40 PM
    #320
    David K

    David K Well-Known Member

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    But in the opposite order, right? i.e. Raised the truck, then had the alignment.
     
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