My salesperson also mentioned that my new 2006 GX 470 "adjusts" to my driving pattern over a certain number of miles.

In light of the "heated" (and now locked) thread which discusses Regular vs Premium gas, I started to wonder how switching between Regular & Premium would "skew" this "learning" process.

I hadn't seen this process documented in my manual (though of course it recommends Premium).

If it really learns / adjusts to my driving pattern, over how many miles, and how does one "reset" that process to make it start learning again?

Thoughts?

 

What the salesperson was most likely referring to is the transmission ecu. It learns driving habits, really has nothing to do with whether you use premium or regular. If you constantly accelerate hard or if you are easy on the throttle from a stop etc. That type of stuff, it will adjust the shift pattern to suit your style of driving. If you want to reset it - you need to either disconnect the battery for a few minutes, or remove the fuse for the transimssion ecu under the hood.

This learning is discussed at length in several places in the GS forums.

 

Agreed!

I was having trouble with my RX feeling slower than normal. It turned out that the ECU had learned wrong and needed to be reset. Once it was reset, the car felt quicker.

 

So, I have to disconnect the battery to reset....
Cuz....the way I'm driving, little hard case...I mean, when the road is clear I'm driving fast (ofcourse I have to watch out for the police, hehe~), on uphill I want to speed up too. but past few months when I pressed my gas padle more ...it does speed up a little but goin steady then speed dropping. so have to push harder to speed up.

I guess, learned something here today.
Thx.

 

All OBD II cars (1996+) "adapt" to your driving. Basically (highly simplified), the cars computer adjusts fuel trims and timing to make the car as economical and "clean" (emissions) as possible. Resetting the ECU will clear the adaptation in most cases and you will return to the baseline program (no adaptation). The car will most likely feel faster too. Adaptation is one of the reasons dyno'ing cars means little these days. The only way to compare apples to apples is to reset the ECU before the dyno run. Then, you are at a "known" baseline. If you run a car around town, then put it on the dyno, lord only knows what timing and fuel trims are in there at that time. Sorry, got off track there.

So, yes, the ECU will adapt to your driving and hence, make the car feel slower than "usual". Disconnecting the battery for a time (30 minutes or so) will clear the memory. But, it will adpat right back after a while. So, if you plan to go run your GX at the local drags, reset the ECU before you go! Tim

 

That is so true, I just did the cluck TSB at the dealer. They disconnected the battery, when I go my car back, it accelerated much better.

 

There is no reason your dealer had any cause to disconnect the battery while performing the TSB for the clunk. I have a copy of the TSB and it never mentions to disconnect the battery while performing the TSB.

 

Bob- any chance you could zip me a copy of the TSB or tell me where to find it?
Thanks

Jim

 

Here is the site with the TSB:

http://www.alldata.com/tsb/Lexus/114...-06/index.html

I am not 100% sure they disconnected the battery, but I do notice the shift point is now higher. It may be their standard practice to disconnect the battery when the vehicle is in the shop for more than 1 day.

 

Jim,

I'm sure you saw the above post which shows the TSB. Let me know.