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2020 LandCruiser comes with transmission cooler, why not Tundra?

Discussion in '2.5 Gen Tundras (2014-2021)' started by sabet, Mar 14, 2021.

  1. Mar 20, 2021 at 8:29 PM
    #151
    Roborob70

    Roborob70 New Member

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    And it won't either, then you start the litagatio....
     
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  2. Mar 20, 2021 at 8:56 PM
    #152
    TILLY

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    If the dealership, or even Corporate Toyota itself won't disclose what caused any transmission to fail, then how can anyone say with certainty why it failed? Do we need an independent council on this one?
     
  3. Mar 20, 2021 at 9:00 PM
    #153
    Roborob70

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    I concur 100 % with your statement. Perhaps, but it doesn't concern me, as I have a cooler.
     
  4. Mar 20, 2021 at 11:33 PM
    #154
    Alex38

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    Interesting. I’ve read on post of other members that have trans temp gauges that they see the best results while towing when using S4 and Tow/Haul together. This is what I’ve used while towing my boat for the last 10 months or so. I don’t have a gauge or an additional cooler at this time. I’m going to have to look into one. You’re the first person I’ve heard of that’s had a problem with a 19-21 truck. Thanks again!
     
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  5. Mar 21, 2021 at 6:30 AM
    #155
    timsp8

    timsp8 Former Tundra owner for 13 years

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  6. Mar 21, 2021 at 6:58 AM
    #156
    Black Wolf

    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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  7. Mar 21, 2021 at 9:01 AM
    #157
    blanchard7684

    blanchard7684 New Member

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    Just driving normally I have repeatedly observed a 10-12 degree drop in pan temps in s4. This is in stop and go and speeds under 55 mph.

    At highway speeds I’ve seen larger drops closer to 20 degrees. When fan clutch engages in s4, at highway speeds, pan temps drop even further. Can’t recall how much but it really dropped the temps.

    with higher engine speed in s4 there is more coolant flow and more air pulled across radiator. Coolant temps go down. S4 keeps torque converter in lock up more than D.
     
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  8. Mar 21, 2021 at 9:27 AM
    #158
    tttrdpro

    tttrdpro Former Naval Person

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    In progress…
    Tow/haul works in my ‘21 also.
     
  9. Mar 21, 2021 at 9:49 AM
    #159
    Vizsla

    Vizsla ☠️☠️☠️

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    It does work, was super focused on how the different modes of the transmission operated and completely forgot about the throttle map. Still uses tow/haul throttle map in s-mode. Apologies for any confusion.
     
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  10. Mar 23, 2021 at 6:50 AM
    #160
    timsp8

    timsp8 Former Tundra owner for 13 years

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    Just saw this in another thread. Post #74.

    https://www.tundras.com/threads/19-22-tundra-owners-transmission-important.85070/

    F5A483DB-3A30-4157-9B7F-2EE0DEBE4AC7.jpg
     
  11. Mar 23, 2021 at 6:51 AM
    #161
    blanchard7684

    blanchard7684 New Member

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    Tow/haul stays active on my truck in s4.
     
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  12. Mar 23, 2021 at 6:54 AM
    #162
    timsp8

    timsp8 Former Tundra owner for 13 years

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    Maybe it didn’t work when they first released the AB60 but then updated it in newer models. I’m about to go somewhere and try it in my 18. They have released updates for the transmission as we have seen they claimed to do for the 19+ when they removed the cooler.
     
  13. Mar 23, 2021 at 9:17 AM
    #163
    BrakeDust

    BrakeDust New Member

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    Maybe all you people who think it stays on don't realize that it's one thing for the little light to stay on, quite another for the computer to operate in TH mode.
    If Toyota says TH is off in S mode, then it's off.
     
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  14. Mar 23, 2021 at 9:25 AM
    #164
    sask3m

    sask3m New Member

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    All you need to do is drive up a long hill in s5 keep the speed and throttle steady then engage towhaul, you can feel the difference +power. I don't need a book to tell me whether or not it's working.
     
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  15. Mar 23, 2021 at 9:26 AM
    #165
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

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    So Toyota engineered these two systems, implemented them both - tell you in the manual to use both - but according to you they are mutually exclusive? Do you have anything in writing to document the trans does not continue to hold gears longer/shift firmer while using T/H is S mode? I’ve been towing in S mode with T/H on for 4 1/2 years and it seems to work fine.
     
  16. Mar 23, 2021 at 9:29 AM
    #166
    realprotundra

    realprotundra Always Skeptical

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    My understanding is that SOME features of Tow/Haul remain on when in S mode but not all features. I believe @ColoradoTJ has some more in depth information about this though. If the recent poster's transmission failed while using S mode while towing rather than just Tow/Haul and Drive I would certainly be interested in more information from Toyota on how Tow/Haul changes based on drive mode.
     
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  17. Mar 23, 2021 at 9:31 AM
    #167
    Vizsla

    Vizsla ☠️☠️☠️

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    I suspect that is from the 2015 FSM, and it’s not always accurate. I’m logging and watching what is going on. On my 2018 tow/haul throttle map is used in s-mode(throttle affects shift points also), have looked through a few files for older models and didn’t see anything that would be different fwiw.. Tow/haul light stays on in s-mode, and on my truck it changes something.
     
  18. Mar 23, 2021 at 9:32 AM
    #168
    realprotundra

    realprotundra Always Skeptical

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    This thread has some good information about Tow/Haul mode and its interaction with S vs. D.

    https://www.tundras.com/threads/tow-haul-vs-d-vs-s-when-towing.85040/

    One very informative post says:

    Another:

     
  19. Mar 23, 2021 at 9:41 AM
    #169
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

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    My 2017 manual indicates AI shift is the only part of T/H that’s relies on being in D to function. It also describes some issues with engine braking when using both S mode and cruise control.

    IMO, if T/H didn’t function in it’s entirety while in S mode they would have pointed it out like they did AI shift.
    A4A3F485-C519-4052-A1B5-9996468DF98E.jpg
    Edit for typo
     
    Last edited: Mar 23, 2021
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  20. Mar 23, 2021 at 9:44 AM
    #170
    realprotundra

    realprotundra Always Skeptical

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    I think AI shift is a huge component of temperature control though. It is literally directing things like fluid pressure, shift pattern, load, etc.
     
  21. Mar 23, 2021 at 9:51 AM
    #171
    AZBoatHauler

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    TBH I have no idea what AI shifting does but towing observations show my ATF runs at least 15-20 degrees cooler using S4 through hilly terrain as opposed to leaving in D. (Around 210F vs 225F+) I let it rev and everything works perfect.
     
  22. Mar 23, 2021 at 9:54 AM
    #172
    realprotundra

    realprotundra Always Skeptical

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    Interesting observation. I am in the camp of "I'm not worried about it" I tow around 4000lbs a few times a month. I use TH in D. Will get a full trans fluid flush every 30k miles.
     
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  23. Mar 23, 2021 at 12:39 PM
    #173
    BrakeDust

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    So you'd need to run that experiment twice to determine what's happening. First time without TH, second time with TH, and compare the temps. Right now it could be simply that you're not hunting for gears in S mode and hence the temps are lower, not so much because of TH.

    But I installed a cooler so I don't even give a thought. Just going to drive it like I stole it and the cooler will take care of me.
     
  24. Mar 23, 2021 at 12:50 PM
    #174
    sask3m

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    It's common knowledge that towing using D causes excessive shifting which in turn causes heat build up. It's not rocket science. Always been that way always will.
     
  25. Mar 23, 2021 at 1:45 PM
    #175
    realprotundra

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    Except that Toyota has given us a specific switch activated tow/haul tune that initiates a tow/haul specific shift pattern (and other shift/transmission related changes).
     
  26. Mar 23, 2021 at 2:42 PM
    #176
    sask3m

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    That may be but in my real world the transmission temp runs hotter towing in D than it does in s mode.
    Luckily Toyota gave us options so each individual can choose to tow how ever they want.:)
     
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  27. Mar 23, 2021 at 3:56 PM
    #177
    DMart19

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    okay....good thread.
     
  28. Mar 23, 2021 at 4:13 PM
    #178
    14burrito

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    I going to venture and disagree.

    IMO...

    Temp is not reliant upon Mode.
    Temp is dependent upon the selected gear.

    S6 temps will run the same a D.
    Hell, S5 may also run the same as D dependent on load.

    Large variable not mentioned in your comment is your highest gear choice in S mode.
     
  29. Mar 23, 2021 at 4:28 PM
    #179
    realprotundra

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    Temp is going to have a lot to do with mode if T/H mode dictates line pressure, TC lockup, gear selection, etc. I really wish Toyota would be more forthcoming on exactly what happens when you are in T/H mode. It's the same deal as ECT mode on the Tacoma. No one really knows what it does.
     
  30. Mar 23, 2021 at 4:35 PM
    #180
    14burrito

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    Please re-read your post and my reply to it.

    T/H or not...

    If you place the gearshift into S6 and compare those temps to D...I bet you they will be the same.
     
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