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3rd Gen Traction Control Modes Explained

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

  1. May 9, 2019 at 8:19 AM
    #281
    David K

    David K Well-Known Member

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    Is there no one who can do this? We traction nerds want to know!
     
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  2. May 9, 2019 at 8:23 AM
    #282
    tonered

    tonered tacorider

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    Sorry! I have been wanting to find a hill like this, but western WA, esp my area, sucks for that kind of accessible fun.

    I do know that Auto LSD was the best mode for 0-60 runs. That took half a day of driving around to find a safe, secluded spot.
     
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  3. May 9, 2019 at 9:04 AM
    #283
    David K

    David K Well-Known Member

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    Thanks tonered...
    I am also hoping for an Off Road TRD 4x4 to give the full test. The hydraulic brake booster that is only in the Off Road is how A-TRAC and MTS provide the 4-wheel locker simulation.
     
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  4. May 9, 2019 at 9:13 AM
    #284
    tonered

    tonered tacorider

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    You're welcome!

    Very true, but as we have seen in some videos and my own experimentation, the SR / SR5 / Sport / Limited seem to have an upgraded TRAC system also. Still limited by the pressure of the vacuum boost though.

    This took some driving around to find, but all modes other than 2Hi default and TCS Off got me up the side of this dock ramp:

    IMG_20180127_151127.jpg

    IMG_20180127_151140.jpg

    I think I posted these in the pre-sticky thread. The rear lifts first, but the front was barely one the ground also. Zero issue getting up over the side with just a bit of throttle above idle.
     
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  5. May 9, 2019 at 10:18 AM
    #285
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    I know I know.
    Being in a state where the gypsum stacks are the tallest hills in their entire state doesnt help though, just saying.

    BTW Tony, interestingly enough when I was doing the jack tests, the Trac and MTS on auto OR dont activate until you get some throttle in. (So with a couple of wheels jacked up, in gear and engine idling along at 5-10 mph, the system wont fire the brakes for traction control even though 1 wheel is grounded and the other spinning freely. As soon as you give some throttle, the brakes fire. It appears the system is inhibited below a certain throttle application level I assume.)
     
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  6. May 9, 2019 at 10:27 AM
    #286
    tonered

    tonered tacorider

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    Yes. That is common for traction and stability systems. I think it is a hold-over from MTs, which allows the engine to not stall. This was the factory procedure for doing an MT fluid swap on our old saab where the new lube was incompatible. You had to fill and flush it twice while idling in 1st gear for a few minutes. Well, being the person that I am, I thought that rowing the gear would help the flush. 2nd through 5th at idle, or 1st above ide, fired off the TCS, which I then just turned off.
     
  7. May 10, 2019 at 9:10 PM
    #287
    vookie91

    vookie91 Well-Known Member

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    nice write up
     
  8. Jun 2, 2019 at 7:24 AM
    #288
    DJB1

    DJB1 Well-Known Member

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    @H3llRid3r, check out page 1. Seems like we were recently talking ourselves into a black hole trying to figure this shit out.
     
  9. Jun 2, 2019 at 10:50 AM
    #289
    H3llRid3r

    H3llRid3r Well-Known Member

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    Not much stock left.
    Ha, yes I’ve been reading this thread.
     
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  10. Jun 2, 2019 at 1:59 PM
    #290
    David K

    David K Well-Known Member

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    The black hole of traction control! LOL
     
  11. Jun 20, 2019 at 11:46 PM
    #291
    PRE-K

    PRE-K Active Member

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    I'll do what I can where I'm at (it's pretty flat here in Houston). Also, getting the time to drive around and find a (legal) place to test is tough.

    Why couldn't Toyota clearly explain the modes!? All this should not be such a mystery.
     
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  12. Jun 21, 2019 at 9:43 PM
    #292
    PRE-K

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    20190621_233112.jpg 20190621_233739.jpg 20190621_233914.jpg
    20190622_000043.jpg
     
    Last edited: Jun 21, 2019
  13. Jun 21, 2019 at 10:32 PM
    #293
    PRE-K

    PRE-K Active Member

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    COMPLETELY CONTRADICTORY!

    TRAC helps to "maintain DRIVE POWER".

    TRAC/VSC "may reduce power from the engine"

    OK, fine, so let's ONLY turn off VSC. Except you can't. One press of the truck/squiggly/off button illuminates TRAC OFF (which means TRAC "cannot be operated"). A long push of the button does turn off VSC, but TRAC OFF is still illuminated. There is no singular VSC OFF mode.

    THE ONLY guess/hope I have is that in 4H, VSC's programming is less aggressive with power reduction. Otherwise, in 4H (in sand, for example) you'll either be constantly cutting power, or you'll be spinning away with open diffs.

    It looks like 4L is the only way to have LSD/locker-ish performance on BOTH axles. BOO.
     
  14. Jun 22, 2019 at 7:51 AM
    #294
    David K

    David K Well-Known Member

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    PRE-K, I think in playing with each drive mode, you may find things are not as they are described in the book! The book does not even come close to acting as a guide.

    Just get outdoors, find a soft area (sand, for example) and a steep hillside... deep ruts are great, too.
    Put the truck in each of the 10 or whatever drive modes and see how it gets through or over in each mode.

    My biggest question for the newer Tacomas is wondering if the terms became reversed. For us Second Gen Tacomas, Trac Off meant the engine regulation was OFF for a stronger Traction Control. In H2, Auto LSD and Trac Off are the same (per Toyota). In H4, Trac (until 2012) had no regulation, then in 2012 a Trac Off button push was added and Trac in H4 then had regulation (like Trac in H2).
    So for Third Gens:
    1) Trac vs. Trac Off in H4, which is more traction or which has engine regulation?
    2) Is there really any traction control in L4 (other than the locker and A-TRAC/MTS/Crawl)? Is it under Trac or Trac Off settings?
     
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  15. Jun 22, 2019 at 8:46 AM
    #295
    PRE-K

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    DavidK... thank you for the reply... I hope you're right!

    The book says (for whatever that's worth, not much apparently) that selecting 4L turns off everything, including TRAC, VSC, ABS, etc., and the only traction control settings in 4L are MTS, CC, and the locker.

    I hate that I haven't had time to test my truck yet. I've had it a month, but life has been hectic! Soon... I hope! I'm still miffed / baffled that Toyota can't / won't effectively explain their product's features!
     
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  16. Jul 4, 2019 at 8:20 AM
    #296
    PB FAB

    PB FAB Well-Known Member

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    I was able to use “TRAC” in my 2017 SR 4x4 automatic over the last weekend. I took my daughter up to Kennedy Meadows and found the gates open to Monache Meadows. The rangers said trail wasn’t officially open yet but some Geologist had left the gates open. Inyo County rangers waved at us as we drove in :thumbsup:.

    There are only two mildly technical sections of trail. Both are uphills about 200 ft long with 1 foot diameter boulders, ruts, and tree roots.

    I was towing my off road trailer, 2000 pounds, and left the tires at 50 psi.

    The truck was in 4low. VSC OFF was lit up on dash. Vacuum booster truck.

    I left the rear arb open.

    During the climb up I lifted the front left tire into the air over a foot followed be the right rear into the air.

    The truck flashed the squiggly traction light as soon as the tire went into the air and my truck climbed forward with no problems. I was impressed with the most basic form of Toyota’s traction control “TRAC”.

    This was all a test. Normally I would have been at 10 to 15 psi and would have locked the rear, and crawled slowly up the hill.

     
  17. Jul 7, 2019 at 9:27 AM
    #297
    PRE-K

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    Thank you for posting PB FAB... interesting what you discovered... selecting 4L is supposed to automatically turn off TRAC, but apparently it doesn't (no "TRAC OFF" light illuminated).

    I guess David K is correct... the manual is only a suggestion as to how the truck might operate. The translation to English can't be THAT bad, can it?
     
  18. Jul 7, 2019 at 10:21 AM
    #298
    splitbolt

    splitbolt Well-Known Member

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    I think it was indicating A-TRAC, not TRAC.
     
  19. Jul 7, 2019 at 10:22 AM
    #299
    David K

    David K Well-Known Member

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    The really sad part is that most just don't care to know...

    I wanted to know everything about these traction systems so I can get the most performance from my truck.

    And, I have from my 2010 and it has been the best of my three Tacomas because of TRAC and A-TRAC.

    I just would think more Third Gen Off Road 4WD Tacoma owners would want to know what is each mode of traction control doing so they can get the most benefit from their $34,000+ investment.

    I am just curious about what has changed since my model.
    There have been a couple of you who did a lot of work on this but it sure seems opposite of what I have found as far as TRAC in H4 vs. TRAC OFF and TRAC or TRAC OFF in L4.

    Remember, at least for 2nd Gen, 'TRAC OFF' is NOT TRAC turned off, it is more TRAC with the engine regulation turned off.

    This is the same as AUTO LSD in H2 (also a TRAC OFF mode in the 2nd Gens). They should have just used the same stupid name (Auto LSD) in H4, or got rid of the name in H2 and just use TRAC OFF for both.

    VSC OFF is the mode that is also TRAC turned off... at least in the 2nd Gens!
    LOL
     
  20. Jul 7, 2019 at 10:23 AM
    #300
    David K

    David K Well-Known Member

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    A-TRAC is only on Off Road TRD 4x4s.
     

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