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Transmission Temperatures

Discussion in 'General Tundra Discussion' started by HTGreen, Dec 9, 2015.

  1. Dec 9, 2015 at 10:45 AM
    #1
    HTGreen

    HTGreen [OP] New Member

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    I added a Scanguage II to my 2016 Tundra V8, but the readings are about 50 degrees warmer than my 2015 Tacoma TDR Offroad V6 with towing package. I used the same codes as the Tacoma

    Transmission Temperature 1 - pan
    TXD: 07E02182
    RXF: 046105820000
    RXD: 2808
    MTH: 00090005FFD8
    NAM: TF1

    Transmission Temperature 2 - Torque Converter output
    TXD: 07E02182
    RXF: 046105820000
    RXD: 3808
    MTH: 00090005FFD8
    NAM: TF2

    Tacoma reading level road 55 mph = 130 Degrees, Tundra same level road 55 mph = 180 degrees. Anyone have any ideas why the differences, I wouldn't think heavier truck would be the answer as most sites say that Transmission temps over 175 cause shorter fluid life, and Tundra should have a larger cooler.
     
  2. Jan 7, 2016 at 1:02 PM
    #2
    csuviper

    csuviper Moderator Staff Member

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    Some Mods :) See build thread for details
    Good question that i missed but i do not know the answer. @LOTSOFTOYS ?
     
  3. Jan 7, 2016 at 3:09 PM
    #3
    HTGreen

    HTGreen [OP] New Member

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    Another question, what is the temperature range that fluid levels are checked at, the Tacoma is at a range of 115 to 130 degrees.
     
  4. Jan 7, 2016 at 8:07 PM
    #4
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    I'd have to look it up. And ur tacoma temp depends on year... most are actually 97 to 115 when u check. My 4.7 runs about 140 normally
     
  5. Apr 27, 2016 at 6:10 PM
    #5
    Ancient1

    Ancient1 New Member

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    20160427_140116.jpg Curious about tranny temps also. Mine goes in the low 200's often....and thats with ambient temps in mid to upper 80'. Truck is empty, except for me and not towing. Definitely warmer than Tacoma.
    Does the Ultra guage read from torque converter or pan?
    Thanks for any info
     
  6. Apr 27, 2016 at 6:52 PM
    #6
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Good question. Ur second gen has 2 sensors. One in each location u mentioned.
    My first gen only has one sensor so it's easier...


    Does it get hot and cold quickly? If so it may be near the tc because it heats up fast there.... pan should take a while for temp changes I would think.

    My first gen has been to 215 while towing...
     
  7. Apr 27, 2016 at 6:59 PM
    #7
    Ancient1

    Ancient1 New Member

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    Heats up rapidly during upshifts but more so when applying brakes and downshifting. Also jumps close to 20 degrees climbing a slight grade.
    It has the tow package and looks like the lines run through the a/c condenser
     
  8. Apr 27, 2016 at 7:09 PM
    #8
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Probably lookin at tc Temps then.... how high do they get?
     
  9. Apr 27, 2016 at 7:14 PM
    #9
    Ancient1

    Ancient1 New Member

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    Got to 210 once today....thinking I may need an auxiliary cooler for the 90 degree + summer temps, especially when towing
     
  10. Apr 27, 2016 at 10:47 PM
    #10
    AaronK

    AaronK New Member

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    Side note: where is the first gen's sensor? Just curious where my 02 is reading from.
     
  11. Apr 28, 2016 at 6:44 AM
    #11
    tibadoe

    tibadoe New Member

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    What are you using to read the temps? I like the layout and display.
     
  12. Apr 28, 2016 at 7:24 AM
    #12
    Ancient1

    Ancient1 New Member

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    Ultra guage....came from a group buy a year or so ago on tacoma world. You can display up to 8 parameters/page with 7 pages. The new models are available with blue leds.
     
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  13. Apr 28, 2016 at 11:55 AM
    #13
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Eh... maybe, I'll be honest I don't know what a typical temp on a second gen is.

    pan I believe
     
  14. Apr 28, 2016 at 5:39 PM
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    tibadoe

    tibadoe New Member

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    I like it - may have to pick one up. Thanks
     
  15. Apr 29, 2016 at 10:13 AM
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    tacouser

    tacouser New Member

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    I have the scan gauge II hooked up in my 2015 5.7. I use it mostly for when I tow my 27' travel trailer, weighs about 5500lbs.
    When not towing my trans temp stays around 195-200.
    When towing it will range between 195 on flat road to around 230 going up hill.
    I have been looking for a good fan to install in front of the trans cooler, or just put in a larger cooler.
     
  16. Apr 29, 2016 at 1:36 PM
    #16
    Ancient1

    Ancient1 New Member

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    Installed a large stacked plate auxiliary cooler on my previous tacoma and the temps dropped 20+ degrees
     
  17. May 1, 2016 at 8:29 AM
    #17
    tacouser

    tacouser New Member

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    I did the same on my 2012 Tacoma, but need to do it on my Tundra
     
  18. May 1, 2016 at 1:37 PM
    #18
    Ancient1

    Ancient1 New Member

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    Lots of unknowns on the Tundra....topping off fluid after cooler install; existing lines appear to go in the a/c condensor, etc.
     
  19. Sep 28, 2016 at 5:01 AM
    #19
    Krohsis

    Krohsis New Member

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    The fix for high tranny temps in the gen 2 and gen 3 Tundras is to pin the trans fluid thermostat open. The same procedure used to check the fluid level. Temps dropped 30-35 degrees. All for the cost of a wire the size of a paper clip
     
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  20. Sep 28, 2016 at 9:38 AM
    #20
    RowdyRon

    RowdyRon Not too old to play

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    Krohsis, any chance you could post up a DIY on how to pin the thermostat open?
     
  21. Sep 28, 2016 at 12:48 PM
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    Kaerntner

    Kaerntner New Member

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    What ° does the thermostat open?Wonder if you pin it and it needs cooling if it'll act like taking thermostat out of radiator?
     
  22. Sep 28, 2016 at 6:32 PM
    #22
    Krohsis

    Krohsis New Member

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    RowdyRon, yes I will try to do that in the few days. I will be under the truck putting stirrup steps on so I will take pics then.

    Kaerntner, yes pinning it open would be like pinning open the thermostat for your radiator. It takes the ability of the tranny thermostat to control temp out of the equation, so fluid flows through the cooler all the time. I'm still trying to find what temp the thermostat lifts, and haven't found that figure yet. It likely is in the service manual I have but with 12,457 pages and a crummy search feature, Im still looking. Based on what I have seen before pinning the thermostat, I believe it likely is hotter than 200*, but that is speculation on my part for now. Because the fluid will be always flowing to the cooler with the thermostat pinned is why I mentioned when outside temps get cooler, it will be important to watch your tranny temps. Having a tranny too cool can be a problem as well. With the tranny fluid heater still in place, it may not be a problem, but since most Tundra owners are oblivious how hot their transmissions are running, this is new territory we are working in, as no one has tried to fix this problem, they didn't know it exsisted. But if it does get too cool, it will take all of 30 seconds to remove the pin and the thermostat will be controlling the flow to the cooler again.
     
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  23. Sep 29, 2016 at 5:48 AM
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    Kaerntner

    Kaerntner New Member

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    Thinking about using instant read thermometer and checking at the front and back?Just wondering
     
  24. Oct 6, 2016 at 6:33 AM
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    Krohsis

    Krohsis New Member

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    So, RowdyRon asked that I do a DIY post on pinning the transmission thermostat open, so here it is.

    This is a very simple procedure, and is the same procedure that is used to check the fluid level in the tranny. Here is two different diagrams from the Russian Service Manual I downloaded (see other post https://www.tundras.com/threads/2015-service-manual.7436/#post-111603 ) on how to pin the thermostat open to check fluid level. In one diagram the center plunger that you depress has not been depressed yet, and extends out of the nut. The other diagram the plunger is depressed in the position that allows inserting the pin to hold the thermostat open.



    To locate the thermostat, crawl under the truck on the passenger side behind the right front wheel. Once under the truck, look forward on the right side of the tranny and you will see the large round part on the side of the tranny, see picture. That round thing is the heat exchanger for warming the tranny fluid with engine coolant.


    Right above the heat exchanger is the tail end of the thermostat. It can be recognized by the hex nut with small holed in each flat of the nut, like lockwire holes. In the center of the nut is the tail of the plunger of the thermostat, that is what you depress with a screwdriver or punch. The plunger depresses very easily and the travel is only 3/8 to 1/2 of an inch. I used a wire that measured with my calipers at 1.35mm. That was a good thickness to hold the plunger in the open position without having to force the wire in. I then bent the upper end of the wire at a 90* angle and the lower side just enough to prevent the wire from slipping out.


    I haven't towed with the truck since the mod, that will happen next week. But I did go over a local pass in the truck a few days ago and the temps were down at a safe level. Prior to the mod, at 80* outside temp the tranny temp over the 7% grade at 70mph would get up to 216*. With the mod, at 82* and 70mph, the temps never exceeded 186*. And if I shifted into S4 the temps dropped lower, down to the area of 172-175* (S6 is an overdrive, as is S5 and doesn't lock up so there is always some slippage, so I have been told, I haven't confirmed this myself, but clearly S4 runs cooler under load) Driving on the level at 70mph, the tranny temps stay at about 165*, and they were 197-200* prior to the mod.

    I will post my data when I tow next week.
     
    Last edited: Oct 6, 2016
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  25. Oct 6, 2016 at 8:45 AM
    #25
    RowdyRon

    RowdyRon Not too old to play

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    John, great DIY instructions and pictures! Thanks for following up!
     
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