DIY transmission fluid change question for IS250
07-05-18, 04:55 PM
#61
Mike, I found the tech papers on the Tocoma which uses the same A760 trans. It said the Trans TCU controls the line pressure.
That said you might get a gauge on and verify line pressure before and after doing this to it.
Let me see if I can find the link to the pdf for you.
That said you might get a gauge on and verify line pressure before and after doing this to it.
Let me see if I can find the link to the pdf for you.
07-05-18, 05:02 PM
#62
Make that the Tundra... Link is here. If the link goes away simply search for A760.pdf It wouldn't surprise me if the truck version had more clutches per clutch pack, more gears in the sun & planetary gears and all that. Clearly the TCU would be programmed differently too. If someone could find documents on the car version A760E (RWD) A760H (AWD), that would be awesome!
So if the TCU controls the line pressure. What does the dial do? It still has notched steps to adjustment. I'm just trying to get a better understanding.
07-05-18, 05:12 PM
#63
I still need to dump my fluid. I'd like to find the long tube filler that allows testing at 180F or something like that.
07-05-18, 07:10 PM
#64
Well I found some good info here:
http://eng.kaps.cz/understanding-the...y-1-2-news-982
According to the info to much pressure will increase heat. It's probably best to leave the regulator setting the way it is. The wierd thing I never experienced the heat. As I had a transmission oil cooler on my gs400. For the 2IS is best to probably leave it at that as it's a sealed transmission.
http://eng.kaps.cz/understanding-the...y-1-2-news-982
According to the info to much pressure will increase heat. It's probably best to leave the regulator setting the way it is. The wierd thing I never experienced the heat. As I had a transmission oil cooler on my gs400. For the 2IS is best to probably leave it at that as it's a sealed transmission.
Last edited by MikeFig82; 08-11-18 at 06:29 AM.
07-23-18, 01:00 PM
#66
https://www.clublexus.com/forums/is-...esolution.html
Mines had 147K before it had issues. A lot of insolubles in mines. Also all my metal counts also is a significantly more. In your case, I think I would do a few drain and refills.
This also shows that 'lifetime' is not really 'lifetime'. I mean, lifetime for the warranty
. Then again, what is the average ownership of the IS? Usually the first time buyer (owners) are probably in a new(er) car since the oldest 2IS is already 12 years old and had some cosmetic issues with the dash and door panels which probably "forced" the users to a newer and more technologically modern car. What that does leave us with? All these now 2nd or 3rd owners starting at around 100K+ that has a transmission that might be questionable in the next 2-3 years without maintenance. Although I have not seen transmission failures too much, but it could also be the fact that there wasn't a whole lot of Lexus sold compared to say a Corolla or Camry which are usually more DIY friendly.
Last edited by Kingdom934; 07-23-18 at 01:05 PM.
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Kmoore0010 (09-05-22)
07-24-18, 10:57 AM
#67
You can compare it to my results here.
https://www.clublexus.com/forums/is-...esolution.html
Mines had 147K before it had issues. A lot of insolubles in mines. Also all my metal counts also is a significantly more. In your case, I think I would do a few drain and refills.
This also shows that 'lifetime' is not really 'lifetime'. I mean, lifetime for the warranty. Then again, what is the average ownership of the IS? Usually the first time buyer (owners) are probably in a new(er) car since the oldest 2IS is already 12 years old and had some cosmetic issues with the dash and door panels which probably "forced" the users to a newer and more technologically modern car. What that does leave us with? All these now 2nd or 3rd owners starting at around 100K+ that has a transmission that might be questionable in the next 2-3 years without maintenance. Although I have not seen transmission failures too much, but it could also be the fact that there wasn't a whole lot of Lexus sold compared to say a Corolla or Camry which are usually more DIY friendly.
https://www.clublexus.com/forums/is-...esolution.html
Mines had 147K before it had issues. A lot of insolubles in mines. Also all my metal counts also is a significantly more. In your case, I think I would do a few drain and refills.
This also shows that 'lifetime' is not really 'lifetime'. I mean, lifetime for the warranty
. Then again, what is the average ownership of the IS? Usually the first time buyer (owners) are probably in a new(er) car since the oldest 2IS is already 12 years old and had some cosmetic issues with the dash and door panels which probably "forced" the users to a newer and more technologically modern car. What that does leave us with? All these now 2nd or 3rd owners starting at around 100K+ that has a transmission that might be questionable in the next 2-3 years without maintenance. Although I have not seen transmission failures too much, but it could also be the fact that there wasn't a whole lot of Lexus sold compared to say a Corolla or Camry which are usually more DIY friendly.
09-05-22, 10:12 AM
#68
Your directions do not tell you how to drain the transmission. Because doing so is not physically possibly DIY.
It tells you how to re-fill it if it has lost any amount of fluid.
Your owners manual explicitly states, in muliple places, that it is never called for to change the fluid, and that it is a lifetime fluid.
Even dropping the transmission pan entirely will only remove 10-15% of the fluid in the system.
This has been gone over repeatedly.
The only way to change a significant amount of fluid (and again, the manual explicitly tells you not to) is using not only a specialized, expensive, machine for it, but then an additional specialized adapter that's relatively new.
Not something one does themselves in their driveway.
So step 2 is a non-starter already. Apart from the whole it being explicitly contrary to the recommendations in the owners manual.
It tells you how to re-fill it if it has lost any amount of fluid.
Your owners manual explicitly states, in muliple places, that it is never called for to change the fluid, and that it is a lifetime fluid.
Even dropping the transmission pan entirely will only remove 10-15% of the fluid in the system.
This has been gone over repeatedly.
The only way to change a significant amount of fluid (and again, the manual explicitly tells you not to) is using not only a specialized, expensive, machine for it, but then an additional specialized adapter that's relatively new.
Not something one does themselves in their driveway.
So step 2 is a non-starter already. Apart from the whole it being explicitly contrary to the recommendations in the owners manual.
WOW !?!? That's all, don't respond to posts that you really don't know the answers to and you're just reading the owner's manual!!!
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Ousisfrau (11-19-23)
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250, change, fill, fluid, fluids, flush, is250, lexus, lifetime, replace, tranny, transmision, transmission, trasmission, type
