Davenlei

iTrader: (1)

Does anyone know the PID value (formula) to have software versions of the ODB tool to calculate the trans temp correctly?

thallium

I used a custom PID for trans temp in my Camry because it was not available in the existing PIDs, however, I'm using OBD Fusion on iOS and there is a trans temp PID but I think it's only available if you pay for the Lexus upgrade for $10.00. It's under Toyota, Lexus, Scion>Engine and Electronic Controlled Transmission>A/T Oil Temp 1 and there is only one A/T Oil Temp in there. That's what I used to deterimine the temps in my previous post.

I'm not sure what other OBD apps or dedicated OBD devices have available but they should probably be able to access it if they can access more maker specific PIDs.

Freds430

Absolutely correct!
Always find it entertaining when someone starts a thread about the transmission fluid and needing to be changed. Many chime in with oh yes it needs to be changed and nothing last forever. They have ZERO experience on transmissions especially Lexus transmissions. Than there are the conspiracy theorist who state Lexus says do not change the fluid knowing it will fail as soon as it gets out of warranty. If I believed this to be true I would sell my Lexus and never ever own one again.

My local Lexus Service manager who has 25 years experience working on Lexus vehicles and has been trained by Lexus said it never needs to be changed. He went to Detroit where the transmissions are made for training and asked what is the #1 cause of Lexus transmission failing. Their reply was the wrong level of fluid and the wrong fluid. Both of these are factors in one changing the fluid. I will save my money and never change the fluid and listen to the experts. Never changed the transmission fluid and never had one problem.
__________________

Cwang

Lexus USA have taken steps to make their cars cheaper to own, this is one of them. My manual states the transmission oil must be changed every 150000kms and it's optional at 75000km intervals, which aligns with older vehicles using similar running gear. Lexus USA have also spaced out the spark plug and diff oil changes, they're not the only manufacturer that have revised servicing requirements in order to bring down the cost of ownership. It's all about meeting the market. I prefer to err on the side of caution when it comes to maintaining fluids that allegedly last a 'lifetime.'

Freds430

I am getting my data from my local Service Manager that has worked on Lexus's for 25 years everyday. Who has been trained at the Lexus transmission factory in Detroit. Please state your experience on Lexus's transmission. If you have more experience than I am changing mine. In the end it all come down to each his own.

bob256k

I have to find it but the jdm manual for the 4gs has transmission fluid changes in the owner's service manual

Cwang

I'm getting my data from Lexus Australia, through the booklet supplied with my car from the factory. Given the difference in product positioning between our 2 fine nations, I'm going to side with the importer which isn't trying to reduce the cost of ownership. I trust the booklet for oil choice too because we don't have nanny state CAFE type legislation - I'm getting specifications from Japan without government intervention.

Like most of us here I have no experience with transmission, just compilations of acquired data. I'm going to quote user alchemist from 2014 who had a sample sent from his 3GS transmission with 100000 miles.

https://www.clublexus.com/forums/gs-...iy-w-pics.html

Blackstone said ~150000km was the appropriate, scientifically based distance to have changed the oil by. I guess Lexus Australia (or more likely the Japanese factory) are on the money...it's almost as if they knew and put the 150K tranny service in my service booklet Re your service manager, I'll take the word of Blackstone Laboratories over a salesman. I know we all have our reasons, those are mine.

JeffKeryk

I simply do not believe in lifetime fluids.
I have been pulling wrenches for more than 50 years.

bob256k

Found this paper, it is unrelated to the fluid change but is a GREAT SAE paper on the transmission:

http://documents.epfl.ch/users/f/fr/...oyotaAA80E.pdf

bob256k

WOOT! found even more documents! Adding them here for my own reference:

https://drive.google.com/file/d/1AUQ...sdLGkBYKX/view

https://drive.google.com/file/d/1eg0...NkOqM-Kf1/view

https://drive.google.com/file/d/1Iix...YMq5EWthl/view

dougm213

From the 2014 Lexus GS service schedule:

Transmission/Transfer Case Inspect transmission/transfer case for signs of leakage. If you discover any leakage, have it repaired immediately by a qualified technician. Note: The transmission/transfer case and transmission fluid are a completely sealed unit. Therefore, periodic checks and replacement of the transmission fluid are not required, and there is no dipstick on the transmission. Any repairs that require adding or replacing fluid should be performed by a qualified technician following procedures in Lexus service and repair publications.

2GR

Is Toyota WS a synthetic fluid? The word synthetic isn't on any part of the bottle and even my local toyota parts guy has doubts.

thallium

My 2013 has a A760E transmission. Did you happen to run across the papers for it?

bob256k

Not yet :/ if I do I'll post it

Cwang

I don't see how a lack of dipstick equates to no servicing being recommended. The transmission isn't sealed, it's as accessible as any other modern transmission as there is a fill, drain and overflow bolt. My service book requires the transmission fluid be inspected every 45000km and reccommends replacement every 70000km. That wouldn't be so easy if it were sealed.
WS isn't even synthetic.