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Old 12-02-2003, 09:15 PM   #1
Discjoshie
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Default ECU Reset: Which way is correct?

I have read a lot of different ways to reset the 2.5RS (2000) ECU. One of which was as simple as unhooking the negative battery terminal, waiting, replugging and idling. Another at http://www.mrtrally.com.au/performance/ (under "ECU's Info." and the Handy tip for resetting) says to plug some "ECU check" plugs together that are under the steering column (they do exist) and driving for a little while, etc.

Which method is the correct one to reset the ECU? Is there only one? If so, which is best/fastest for adjusting to new power mods?

Thanks,
Josh
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Old 12-02-2003, 09:26 PM   #2
joubtt
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There is a note to step on the brakes to drain the last bit of power. Add this to the rest.
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Old 12-03-2003, 09:51 AM   #3
WAFlowers
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When I installed a Weapon-R intake on Thanksgiving I pulled the negative battery terminal, stepped on the brake peddle a few times and let is sit while doing some other work. When I hooked everything up again I not only had to reset the clock and radio stations but the car accelerated like a pig. An overweight pig at that.

But within days it had figured out that it could breathe and is running very nicely now. The off-the-line hesitation I'd always had is gone!
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Old 12-03-2003, 10:49 AM   #4
White 2.5rs
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lol well those stations arent stored on flashram and the clock doesnt have battery backup
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Old 12-03-2003, 08:21 PM   #5
my2000rs
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both methods is correct about resetting. but the easy way is to unplug neg, step on brake, plug back the terminal, start engine, let it idle w/out touching gas about 5 min, turn off car, start it again and drive like crazy so the ecu can relearn again....i use it all the time with my 2000rs
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Old 12-04-2003, 03:57 PM   #6
Discjoshie
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Thanks guys. I guess if both methods will do the same thing just as fast and effectively, then I will just do the easier one with the negative battery terminal. Thanks again!
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Old 12-06-2003, 05:02 PM   #7
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Quote:
Originally posted by my2000rs
both methods is correct about resetting. but the easy way is to unplug neg, step on brake, plug back the terminal, start engine, let it idle w/out touching gas about 5 min, turn off car, start it again and drive like crazy so the ecu can relearn again....i use it all the time with my 2000rs
This is the best method, but I usually will leave it unplugged for over 3 hours is all, just to be sure.
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Old 12-09-2003, 06:22 AM   #8
alfcanada
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does this method work with the new MY03 model? (after bugeye)
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Old 12-09-2003, 12:29 PM   #9
subarucyclist
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How often to you guys reset your ECU's?

I know you're supposed to do it after installing any mod, but it seems like I've heard that our cars "learn" to kinda detune themselves, or something like that, and resetting the ECU occasionally will make 'em run better, if only for a little while.

Is this something you do often, and if so, how often?
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Old 12-10-2003, 12:18 AM   #10
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With a torque chip or powerchip in a normallly aspirated subaru, you don't need to keep resetting the ECU to gain power.

When I turbo'd and had a chip, the only time I would need to reset the ECU was when I would get a check engine light for "catalyst efficiency below threshhold" which initially was caused by too high fuel pressure, and later caused by running without cats. I would reset to clear the light.
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Old 12-10-2003, 11:58 AM   #11
subarucyclist
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Thanks for the info, but what if you don't have an aftermarket chip or anything?
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Old 12-12-2003, 12:50 AM   #12
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Well,

Interesting question. If you are often a mild driver, and want to keep max power for times you need it, you will find that resetting the ECU all the time will kill your gas mileage.

I would seriously consider a torquechip or powerchip someday soon - you will appreciate the thing, especially with a few mods.
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