Should the ECU be reset after transmission flush?

Is there a consensus on this, or possibly comparisons between people who have or have not had their ECU reset after doing a transmission flush?

[I did try a search, and maybe I am not using the search feature correctly, but I did not come up with much.]

 

Considering there's only one true way to reset the ECU in regards to the transmission and it requires techstream, its not done at all imo. It's more than just unhooking the battery for 5-10min.

 

Thank you. I realize a reset requires Techstream. I am just curious if people have any experience with a reset vs no reset, or any problems from not resetting.

 

Why would you want to reset your ECU after a transmission flush or service? What is your thinking behind this?

 

I am trying to find the source. I thought it was mentioned in a page of a tacoma manual that was posted online [I thought here], and also in a thread about flushes.

 

As a tech I have never heard of this at all and I have done a ton of trans svcs and flushes. There are updates and flashes to the ECUs all the time to help with issues like transmission shifting etc. You find that source and post it I would like to read it and I have no problems being stood corrected. I see no reason you need to. I have not done it on my truck and have no issues.

 

no

 

No what???

 

I can't find the info now. I had been doing a lot of reading regarding the flush procedure and probably found the info [be it correct or not] through a series of links. If I recall correctly, it had something to do with the computer ''learning'' under the conditions of the old fluid and it's slow degradation over time, and after a flush, some of the initial, new fluid properties had suddenly been restored, but the ECU was still operating under the properties of the older, slightly degraded fluid.

I am not saying this is correct, it just sounded plausible. If this is untrue, or unnecessary, all the better. Thanks again.

 

There is some truth to that. Your ECU is constantly "learing" driving habits, altitude, shift points etc. But you should not need to "reset" the ecu after a flush it will relearn what it needs to. If you find those sources please share. You do have to read the pid for trans temp to check the fld level though so that you check it at the correct temp so that you make sure it is full.

 

No, I personally wouldn't. I only reset after major repairs/updates. The 2nd gen trans is good and doesn't require any hand holding.

 

I found one source but there was at least one more that I thought was from a manual.
This was post #705 from the * How To Drain/Refill Automatic Transmission Fluid * thread here on TW. I don't know how to post a link to the actual thread.


Don't have to open the thermal valve on Tacomas. However if the idle is fluctuating because the jumper wire is still in, the fluid will warm up too fast & you'll end up draining out too much. End result is its under filled. I work at a dealer & have done hundreds of the fluid checks/adjustments. I've seen only 4 in the last 10 years that's actually properly filled. They're all usually low by 1/2 quart or more. It's a good idea to reset the learned memory after the fluid change to relearn the shifting time. Over time the ecu learns to shift slower because the fluid doesn't have the same viscosity. When you put in new fluid, it still shifts slow, & may slip & burn the friction material in the clutch packs.

 

Not listed in the FSM procedure (attached). Granted this is the procedure for adjusting fluid level vice flush. Could not readily find the flush procedure.

 

Don't over think it man, change the fluid and let it ride. If these trannies were that delicate we would be seeing failures everywhere

 

Thanks everyone, glad to hear this is not considered necessary.

 

There isn't going to be a flush procedure only a drain and fill and for replacing the filter.

I don't know what he is talking about draining out too much it is best to drain as much as you can hell take the drain plug out and let the truck sit over night to let as much fld drain down and out of the valve body as possible. Then fill through the fill plug get the fld up to checking temps check it and add more until its full. The learned shifting has more to do with your driving style than the condition of the fluid. Now on some of the much newer stuff and different vehicles that may monitor the condition of the trans fld. like your maint. reqd light for the oil change they may do something like that. His first sentence about draining too much fld out and being warmed up too fast has me baffled and makes me wonder about his actual knowledge, skillset, and experience level.