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Discussion Starter · #1 ·
got the scan guage installed with atf codes and am running about 140 down the highway while its 70 degrees outside. my intake air temp runs about 98. i'm watching the mpg go from 5 from a stop light to 9999 while coasting on the freeway so i'm GRANNY-ing it for the most part.

i just think my atf is a little warm. what is the "right" temp???
 

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Has anyone tried an IR thermometer on the pan from the bottom and compared this to a gauge / Toyota data acquisition equipment (dealer)?
 

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140 is a good average on mine in cooler weather. We'll see what a AZ summer brings.
Here's a question or two:
Do you think you would see transmission failure (reflected by a tranny temp rise) like this one
http://www.tundrasolutions.com/forums/1gen-tundra/188338-2002-tundra-transmission-planetary-gear-failure/ coming early enough to get it to a shop before the needle bearing let go? (That seems to be the primary reason for these transmissions to fail).
I've been kicking around having the planetary gear rebuilt before any failure has the opportunity to tear up the entire transmission.
What do you guys think?
Oh forgot to add that I've got 70K miles on it.
 

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There was a thread a while back where someone posted the codes to
try on the ScanGauge for ATF temperature. I put the codes in and
they do work, however I have a 2002 and as someone mentioned they
don't work for the later models, 2005 and up I beleive.

To the OP, what do you have for a package for your Tundra. I have
the TRD and the transmission cooler. The reason I ask is because
generally when I'm on the highway my ATF temp is about 120 or so.
I think anything over 190 is bad, so you're still well in the safe zone.
Mine is usually higher in the city in stop and go traffic, but I haven't
seen it go above 155 yet, but of course the real hot weather
hasn't hit either. Hope this helps.

John
 

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The Scan Gage "X"Gage transmission temp codes worked on my 04 as well.....I even wrote to the Scan Gage people and asked about it and they told me the same thing.....it works on some models but not all.....o well....

Mine runs about 140 degrees F most of the time...:D
 

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Mines about 154 degrees F in a tropical climate. I've seen it climb up towards 200 degrees F while hauling junk weighing over GVWR uphill following a tractor trailer.
 

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Checked it today. On the highway going about 70 MPH with the temperature
of about 70 degrees the ATF averaged about 118 degrees. This is with an
empty truck and no cap.

John
 
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