ECU Reset

Okay i have a 2001 tacoma with the 3.4. my transmisson has been shifting down into first kinda hard when comin to a stop (automatic) i started noticing this about 2 months ago. right before i started to notice this i had a guy weld my exhaust bracket back on and he didnt reset my battery. when i got in the truck none of my gauges worked. it took about 10 minutes before they started workin again. i then noticed the transmission was shiftin rough back into 1st. i have been told by several people, a few on here, that i should reset my ECU and it should fix it. i talked to toyota and they said the same. But the said i would need to bring it in to the dealership to get it done. Im sure its gonna be expensive for them to do. and they said i couldnt do it myself. They said disconnecting the battery would not solve my problem. Does anyone have any thoughts on whether i should just take it to toyota or if you know a way to reset it without takin it to toyota. Any help is really appreciated, thanks

 

Ive got it disconnected right now. even though they told me it wouldnt fix it. So we'll see. I just wanted to know if there was another way or if people thought this would fix my issue

 

Go into the fuse box under the hood on the driver's side and pull the ECU fuse out for 5 minutes, then put it in and run the truck for 5 min. without touching the throttle and with no lights, ac or anything turned on. After 5 minutes shut it off. Now the ECU has been reset.

 

Are you sure it will reset it?

I just talked to another toyota dealer around here and they said they if i disconnect the battery it should fix it.
Anyone have any thoughts on if this will fix my issue?

 

disconnecting the battery is ok. It's just that you lose the radio presets and such. That's why I pull the fuse to clear it.

Just make sure you run it for 5 min. then shut it off. That way the computer has a baseline to program with. It is best to do this with the truck all warmed up for the proper baseline.

If you sit and watch the tach during reset it will settle into its final idle at around 4-5 minutes.

 

Okay I put the battery cables back on and took it for a test drive. So far so good. It hasnt done it yet

 

I've run it up and down the road and come to a stop about 10 times. It's shifting better and isnt hard shiftin down to first anymore. Thanks for the helps guys

 

My 2005 2.7L 5-speed manual access cab w/ no mods has had issues in 1st gear for a few years: it bogs down every time I start out in 1st gear, like it's having issues w/ fuel injection or something. It had me pretty pissed and I was thinking I'd like to sell the MF because it's so annoying, but I found a link about pulling the negative battery terminal for 10+ minutes to reset the ECU.

I did it 3 days ago and afterward, the truck drives like new. No joke. I wish I'd done it a few years ago. No more hesitation in 1st gear, no more nearly stalling at stop signs, etc. I didn't pull any fuses or anything else, just disconnected the negative wire (actually, I did it for 16 minutes because I got distracted).

 

I had replaced heads on a tacoma I bought, did not replace knock sensors, ended up with a code for bank 1.
Bought genuine toyota knock sensors from Amazon for 92.00 each , and the harness was 32.00
Put everything back together,had not disconnected the battery.
Cleared the code, but truck ran poorly, and was pulling timing still.
Pulled the exam fuse under the hood , tinkered around for about an hour , put it back in and it has been running very well since center.
All of the adaptive learning ecu's I have ever worked on , knew when it had a new part, and knew where to start learning.
Not toyota