2017 Tacoma auto transmission slippage.

Yea man, all those exclamation points.

 

Hey I thought mine was doing this downhill in third or whatever gear, it’s actually something to do with the emissions system. Keeping something warm or cool I can’t remember, but it’s normal.

 

It will after x keystarts where the problem is still present. Until then they are not 'set', just pending.

 

Are you a Snowflake ?

 

That's a question only a snowflake would ask.
Does my question/observation about the exclamation point offend you that much? Or are you just projecting?

 

Every transmission that has ever slipped in my lifetime exhibited symptoms when accelerating, putting a load on. Not letting off the accelerator.

 

It is the Atkinson Cycle engine I think. When the load is taken off, the Atkinson cycle does what saves gas.

 

To me it sounds like the converter being unlocked. There's a thread around here where OVTune talks about some of the sorcery of the stock converter programming and how some people misinterpret the converter locking and unlocking as gear shifts

 

I think it would have to be really low for that to affect shifting. These things hold over 11 quarts.

 

I would be extremely surprised if anything mechanical was wrong with it. My guess is it's nothing, or at worst a software update.

 

I was wondering how a downhill slip happens too. If the transmission is actually slipping, it'll slip under heavy load/acceleration. Sounds to me like the auto downshifting.

 

If you are in cruise control it will down shift to maintain speed and rpm will climb, going down hill. Sometimes it will do it without cruise.

 

FYI: here is the Toyota procedure for checking the trans fluid:

AC60F_ AUTOMATIC_TRANSMISSION FLUID_ ADJUSTMENT_2016.pdf

 

How familiar are you with damper lockup torque converters(a.k.a. slip controlled, half-lock, partial lock, flex lock)?
How about transmission programming coupled to engine intervention programming?

 

So the overflow hole is what used to be the drain hole ?

 

What are the average temps these transmissions run? Just hooked my ultragauge and was surprise that the trans temp was ave 180°. Is that normal for these?

 

Normal 190. You are fine

 

Thank you. Just was curious since my 12 4cyl was always around 150.

 

Just got the truck back from Toyota and I quote! "Shifting of the fluid causing NO fluid to be getting in the line causes shift issues to happen". Can't make this stuff up and they actually put it on my service invoice.

 

I would definitely try a different dealer just to see .