I followed the DIY instruction on resetting the ECU by pulling two fuses (ECU 10 Amp) and EFI (25 Amp) and I remember a few people here stating that the car would only start on the second try. My started on the first try.

Also used CRC MAF sensor cleaner to clean out the MAF. Let's see if I can tell the difference or the mileage would improve at all.

I've never tried with pulling fuses, have always disconnected the battery. It has always taken 2 tries for me. Maby you pulled a wrong fuse and the ECU didn't reset?

Mine took 2 tries aswell.
Was the MAF dirty? Aftermarket filter/intake?

take me 2 times as well

Why bother resetting ECU at all? Just to reset the car so it will re-learn your driving habits?

One of the biggest myths on the internet.

The ECU learns idle speed adjstment and fuel trims. It doesn't care about or remember your driving style.





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Except it's not a myth. The IS also changes shift pattern behavior based on driver history for example.

If you don't want it to you need to leave it in S-6 instead of D, as S turns off the AI-Shift control.

There's threads on this going back to at least 2007 for the 2IS.

Not that I could tell since it was between the two plastic fixtures, but my 2007 has 52K and I'm guessing the lady who leased it didn't clean the MAF and judging from how incredibly dirty the air filter was I thought I'd clean the MAF while I change out the air filter.

I know people have made dumber mistake but the DIY has a picture and notes pointing at the very two fuses. I also double checked the inside top of the fuse box cover that has names of all the fuses.

And I am sure there is a credible source to verify this information. ??

And I am not talking about about opinions of internet "experts" from public forums/chat boards.

How about actual published technical information from Lexus?


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The only time that i've reset my ECU is when I have done some sort of upgrade like the intake or exhaust. I've had the thought that the ECU will learn the new item being installed and work at optimum efficiency. May do nothing but hell if I know.

Without unplugging, the ECU would take a while for it to learn. Might as well unplug it so it loses what it had there before.

I just put my F-Sport High Air Flow Air Fitler in today and had my battery unplugged for an hour. Once I plugged it in, I started my car and immediately noticed things were sort of lost, such as tank ave, radio channels, some nav preferences and the RPM at idle was a bit high. I left my car sitting for about 10-15 minutes idling for it to warm up as it appeared to be learning as I can hear the engine, kept adjusting the idle rev for like the first 2 minutes (idle RPM was a bit high) then it seem to stablize somewhat; took it for a test drive and back, and the RPM went down it's normal RPM levels where it would normally be.

Sure!

Here's a post from 07 where the transmission behavior is mentioned:
https://www.clublexus.com/forums/2541417-post16.html

Now here's the same guy showing you a page directly from TIS (the Lexus/Toyota database the dealerships use) explaining the AI-SHIFT function (and mentioning it only operates in D, not S)-

https://www.clublexus.com/forums/3305550-post10.html

I'm sure if you PM him he'll be happy to go into even more detail about it though, AFAIK he has an annual subscription to the service.

You mean like yourself, when you claimed the opposite of what Lexus says with nothing to back it up?


Anyway, FWIW I don't bother resetting the ECU because even when I put the intake and exhaust on.... because the ECU is (outside of S mode) always in learn mode... so the only thing you'd accomplish is putting it to "factory" baseline rather than "what it has already learned" baseline.... after which it'll still take the same amount of time to learn the new mod... so I can't see why it'd matter which baseline it starts with, and this way I don't have to reset all my radio stations.

Thanks for the links

TIS info is what i was referring to.

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