What are the various ways to reset your ECU?

[macrwrx]

Hi everyone, I was thinking of resetting my ECU, I just installed a KN filter and thought reset might help get the computer up to speed, do you recommend this? If yes then is there another way to reset the ECU with out disconnecting the battery, for example may be pulling out the fuse for the ECU will that help? If there is not another way can someone explain to me how to disconnect in a correct manner . Thank you

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[totoherbs]

Pull the negitive batt cable, try to turn it over to make sure its dead. Then plug it back in.....

It wont make a difference, your not going to see any real gains from a filter. Just butt dyno gains...

[twizzstyle]

isn't there more to it than that?

I don't know exactly, you could check www.scoobymods.com might be something on there....

but I thought you disconnected it for like a half hour, then re-connected it, started it, and let it run until it was at normal temp, without touching the gas.... something like that?

[totoherbs]

Originally posted by twizzstyle
isn't there more to it than that?

I don't know exactly, you could check www.scoobymods.com might be something on there....

but I thought you disconnected it for like a half hour, then re-connected it, started it, and let it run until it was at normal temp, without touching the gas.... something like that?

Ya, some may do that.... might be a good idea if your on 91 octaine. The reason for doing it is so the ecu can adjust for the lower octaine with out running into knock. But its not a must...
This guy at scoobymods says leave it out over night, but if you try and turn over the car, and maybe press the brake.

http://www.scoobymods.com/forums/sho...ight=reset+ecu

[Uncle Scotty]

You do not need to reset the ECU for every little thing.
For an airfilter...no.
For a turbo back exhaust or an IC, yeah OK.

The ECU reset is WAY over used, and usually not necessary.

[elixirvtec]

very interesting topic macrwrx

thanks for asking it.

what about a catback exhaust, KN air filter and air silencer removal. would resetting your ecu help for those mods? i am tracking my car for the first time next weekend and was thinking. would resetting my ECU help?

[sonicblue]

yes, with those mods, a reset may be in order. Make sure engine is cold. Disconnect negative battery terminal and pump brakes a couple times to discharge any residual power. Reconnect the cable.

Start car - do NOT touch throttle at all. Let car come up to temperature or wait until the fan cycles on and off once. Turn off car. Restart and take the car for a drive, "teaching" it how you want. I.e., if you want max performance, go get on that beeyotch.

[Julian]

An alternative method to reset the ECU is to use a OBD-II scan tool. You could also unplug your ECU.

Also, resetting the ECU doesn't really do much except dump what the ECU has learned about your engine's behavior over the past however-long. If you change things like adding an intake or exhaust, you CAN reset your ECU. It then just goes about learning your engine's behavior using factory-set baselines.

If you didn't reset your ECU? Your ECU will relearn/modify settings when you make changes, and modify baselines accordingly.


Cliff Notes: Doesn't matter. ECU will learn.

[Uncle Scotty]

Originally posted by sonicblue
yes, with those mods, a reset may be in order. Make sure engine is cold. Disconnect negative battery terminal and pump brakes a couple times to discharge any residual power. Reconnect the cable.

Start car - do NOT touch throttle at all. Let car come up to temperature or wait until the fan cycles on and off once. Turn off car. Restart and take the car for a drive, "teaching" it how you want. I.e., if you want max performance, go get on that beeyotch.

If you do this make sure you have the best gas in the tank you can get...I always use toluene anyway, but if you do this with the extra octane it will make things much happier power wise as long as you keep the octane up and get no knock...