Removing a fuse to reset the ECU?

[stugray]

Originally Posted by calibrz

just pull the negative cable, much easier. done it multiple times without any issues.

You didnt actually read the thread did you?

[KAR]

Originally Posted by Sellout

In a word, nothing.

wow, say you put in race fuel.. resetting the ECU will let it learn the parameters quicker than letting it learn through changes from "normal" fuel to hi-octane fuel.. that's one reason I would pull the fuse..

[Malt]

Originally Posted by KAR

wow, say you put in race fuel.. resetting the ECU will let it learn the parameters quicker than letting it learn through changes from "normal" fuel to hi-octane fuel.. that's one reason I would pull the fuse..

What evidence do you have to support that assertion or are you just blindly making claims without facts to back it up?

[21_nola_05]

Originally Posted by calibrz

just pull the negative cable, much easier. done it multiple times without any issues.

ok thx u

[JRP]

Originally Posted by JRP

In looking at the wiring diagram found on this forum, it looks like the 7.5 amp EFI +B fuse is the one to pull which is the same for a Toyota. This runs from the battery directly to the BATT pin on the ECM.

This is the fuse you pull. Disconnecting the negative cable will wipe your head unit saved stations, shift light indicator, etc. Pulling the fuse is much easier in the long run.

[steve99]

Read this no ecu reset necessary :-)



http://www.ft86club.com/forums/showthread.php?t=53477

[Sphirit]

link doesn´t work

[steve99]

does now

[KAR]

[QUOTE=Malt;1741308]What evidence do you have to support that assertion or are you just blindly making claims without facts to back it up?[/QUOTE

now, go put some C16 in your tank with out resetting the ECU, then go back to regular fuel with out resetting, car will run like shit.. I don't need to give you evidence, this is a forum and Im just giving my input on what ive experience..

I do it to all my toys when I add race fuel or going back to pump..

[steve99]

[quote=KAR;1745255]

Originally Posted by Malt

What evidence do you have to support that assertion or are you just blindly making claims without facts to back it up?[/QUOTE

now, go put some C16 in your tank with out resetting the ECU, then go back to regular fuel with out resetting, car will run like shit.. I don't need to give you evidence, this is a forum and Im just giving my input on what ive experience..

I do it to all my toys when I add race fuel or going back to pump..

Modern ecu constantly learn based on fuel temp air and coolant atmospheric pressure ect.
If you change fuels eg higher or lower octane or changes in fuel density due ethanol content the ecu will adjust
The time taken depends on the amount of change or learning required.

If you reset you ecu it will go back to default parameters for fuel trims, timing ect
And will then nead to learn the current conditions and fuel and adjust its parameters within the allowable limits for the ecu current tune.

This relearning may take longer or be shorter if you did not reset ecu depending on how far away the new fuel or changes require learning away from the default parameters or the prevoius parameters learned by the ecu

However wether you reset or not you will end up at the same point learning wise. The only difference being dtc and a few counters reset if you actually reset ecu rarther than just let it learn new conditions by itself.

Learning in modern ecu,s is a constant process within the limits set in the ecu configuration tables
@Malt and myself run e85 which varies in ethanol content pump to pump and the ecu learns this constantly without reset, the tune we run adjust betwenn e60 and e90, most likely similar octane and fuel density difference than petrol and c16 :-) either way ecu can only learn within it preset limits no matter what fuel you put in, to get the maximum benifit you need to tune for better fuels

Reseting is not going to harm anything but not rearly necessary uless you want to clear DTC CEL codes and check engine light.