In regard to learn mode my wife complained it drives not like her old car. After I put the car in learn mode she noticed and said it drives better.

 

 

Yeah, my thoughts exactly.

 

Woah there, the armchair comment was in reference to @arentz07 "But yeah that could be "conventional" wisdom at best" post. NOT devaluing this thread or its advice. Def taken out of context. It was ONLY in reference to certain "conventional" wisdom things, (like ecu mappings, break in procedures) where there is a lot of opinions but its a complicated matter best left to experts.

Next time I'll use quotes function for that, sorry

 

All I meant to say was that sometimes I forget that a lot of the advice I hear about cars is based on outdated opinions. Now that I re-read the conversation, I think you understood that. However, when I read your comment I perceived it as calling the above posters armchair experts, rather than the people I was referring to with the conventional wisdom. So my bad, I overreacted/misunderstood a bit.

 

Ah gotcha, the way you wrote it seemed like you were saying we were all armchair experts. Yeah, I would try to word things differently next time as it is hard to infer tone by reading sentences. But yeah, there are things that only experts can truly answer and all most of us can do is guess or try to research as much as possible.

 

In old days some cars Toyota included there was a light on the dash to signal time to shift.... If one wants to drive really, get a car with manual shift.

 

In old days some cars Toyota included there was a light on the dash to signal time to shift.... If one wants to drive really, get a car with manual shift.

 

Disconnect battery to do it on Lexus? On MB it takes a few minutes sitting in the driver's seat with ignition in run mode. You can do it any time you want.
TCU is controlling tranny communicating with ECU, that's what I understand. Actually putting TCU to learn mode takes few seconds then TCU and ECU
communicate which takes few minutes. That's all. There are some Youtube tutorials about this.

 

Well, it would seem the TCU in Lexus vehicles is continuously adapting. Disconnecting the battery would just put it back to factory mappings.

 

TCU is subset of ECU. IMO, TCU is not independent.

 

The FRS I had before my Lexus had a shift light/beep you could set. I do miss that. My understanding is most new cars are continuing to vary setting with the ECU depending on many factors. Such is the sophistication of modern engine computers.

 

Well, the IS does have the Rev Indicator setting, which turns the tach red. You could use that as a makeshift shift light, but it'd be fixed of course.

Basically if you are trying to be efficient it's probably best to let the auto do its thing.

 

^ Pretty much what I'm doing. It's more important when downshifting to know gear will be available to somewhat anticipate versus reacting when, oh theres a beep, I can't go down anymore.