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Engine Reprogram your ECU

Discussion in 'Powertrain' started by HK-Racer, Jul 17, 2004.

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    HK-Racer Guest

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    Reprogram your ECU

    How to reprogram your ECU
    The purpose of this tech is to show you how to reprogram the ECU to give you better gas mileage after an upgrade.
    After you get a performance upgrade (i.e. Headers, Exhaust, Intake, Etc.) follow the following steps to reprogram your computer. Turn on the car and warm it up. Make sure that it’s running at its normal idle. Next, turn off the car and pull your ECU fuse located in the fuse box under the hood. Keep the fuse out for at least 5 minutes, then plug the fuse back in and close the hood. Start your car making sure NOT TO TOUCH THE GAS WHEN YOU START IT UP!! Let the car idle at its normal idle speed for about 3-4 minutes, then shut off car and restart once again.
    That’s it! Your ECU is programmed to give the proper air and fuel mixture for your upgrades. By taking out the fuse you kill all power to your computer and resetting the "program" that gives the mixture. Now by not touching the gas as you fire it back up, it will reprogram itself to give you the best MPH as it can.

    I am no way responsible for any damages or injuries caused by doing these modifications.
    HK-Racer, Jul 17, 2004
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    kaosfm Guest

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    Is this in any way different than doing the same procedure except for unplugging one of the battery terminals rather than the fuse?
    kaosfm, Jul 17, 2004
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    HK-Racer Guest

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    why i have no clue about the battery terminals.
    HK-Racer, Jul 17, 2004
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    corollinout New Member

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    i would think unplugging the power from the battery would do the samething, since you are taking all the power away from the car, the only thing that sucks about resetting it is, you have to reprogram the radio
    corollinout, Jul 17, 2004
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    HK-Racer Guest

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    the radio? wtf? i didnt know that.
    HK-Racer, Jul 17, 2004
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    LowRolla Will work for turbo

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    yeah when the radio has no power - it doesn't remember your stations you programmed into it
    LowRolla, Jul 17, 2004
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    hybridtheory Guest

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    hmm good idea havent thought of that, i'll do that tomarrow :) mixture has been kind of whacky :p
    hybridtheory, Jul 18, 2004
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    thespud Guest

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    Actually, the manual has said that to reset the ECU on a 4A-FE (others will be similar), after you take the fuse out, or unplug the battery (unplugging the battery works best, as it takes power away from *ALL* ECU curcuits), you start the car, run it for 30sec then shut it down. You then repeat that until the idle returns to normal, or around 10-15 times.
    thespud, Jul 18, 2004
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