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Old 07-16-2001, 03:04 AM   #1
Legacy SUS
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Exclamation Resetting the ECU, once and for all! 7 steps.

O.K. I've heard everything from 10 minutes to 24 hours.

This is how you reset the ECU.
1. Turn everthing off in the vehicle. Stereo, lights, seat warmers everthing.
2. Disconnect the battery.
3. Let it sit for 45-50 minutes.
3. Connect the battery(if you have an alarm then have your remote ready it will go off and it will be loud. If you dont have a remote then you must turn the car on, DON'T TOUCH ANYTHING and push the alarm reset button under the dash on drivers side. It should be about a fingers length infront of the hood opener(this is for a legacy it might be in a different place for an Impreza, but should be in the same general area.))
4. Start the car(if you didn't already)
5. Let the car warm up for about 15-20 minutes. A full warm-up cycle.
6. Turn the car off.
7. Turn the car back on and go for a drive (a spirated one).

You will have to reset all your presets. If you don't have to than try going alittle bit longer.

Or you can spend $50.00 at the dealer and it will take a few minutes.

Oh. can a moderator move this to the correct location. Didn't exactly know which one it should go in since all have this same question. Thx.
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Last edited by Legacy SUS; 07-16-2001 at 03:08 AM.
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Old 07-16-2001, 11:22 AM   #2
RacerinLSL
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If you find it neccessary to reset your ECU, you can make it a much shorter process by just depressing the brake pedal after disconnecting the battery. This will discharge the electrical system immediately and you can continue with the rest of the steps.

CHad
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Old 07-16-2001, 11:50 AM   #3
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ya forgot to mention that you only have to due the negative post. You also forgot to mention that the car will die on first startup after reset. and then start it again let it sit a few minutes. turn it off, turn it on and THEN do the spirited drive.

And my biggest pet peeve for ECU resets? write down your trip millage BEFORE the reset! I watch my millage like a hawk so it drives me nuts when I reset and lose the trip millage without getting the millage down.

That's cool about the break thing though, I didn't know that one.
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Old 07-16-2001, 12:31 PM   #4
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last time i reset i pretty much did the same thing. i didn't notice the engine dieing out the first start or anything. i tried the brake pedal thing too. it discharges most of the power but you still need to let your car sit for awhile before connecting the battery again.
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Old 07-16-2001, 12:38 PM   #5
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My car never dies either. I only let it sit about 5-10 minutes after depressing the brake pedal and everything was reset.

Chad
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Old 07-16-2001, 01:49 PM   #6
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I prefer to pull fuse SFB#5. better than having to reset all my radio setting and clock
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Old 07-16-2001, 01:54 PM   #7
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Is that the fuse? Someone told me #2 or #3 but it was neither of those. So SBF5 is the one!! Cool.

Chad
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Old 07-16-2001, 02:40 PM   #8
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You are forgetting the reason of this post. This is a sure fire way to reset the ECU. Also your car shouldn't die on the first start. The deressing the brake is a good idea, I haven't heard that one before
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Old 07-16-2001, 02:43 PM   #9
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No, I didn't forget. I'm just trying to make it easier. There's no reason to wait 45 minutes when you don't have to.

Chad
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Old 07-16-2001, 03:52 PM   #10
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Your car will/should die the first restart after the reset.
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Old 07-16-2001, 04:21 PM   #11
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"DON'T TOUCH ANYTHING"??? I don't see how the brakes or listening to CD's have anything to do with the ECU reset-engine performance. But 20-30 minutes at idle after reset should be sufficient.

One of my friends told me to punch the throttle right after reset so it will run richer=run at a higher performance... Someone comment on this?
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Old 07-16-2001, 04:23 PM   #12
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I reset mine this weekend... and mine died on the first start.. it may not be extrememly noticable, but it does die. how exactly do you define 'spirated'... i take it as bouncing off the rev limiter a couple times....hard accels.. basically dogging the car

Matt
NSG Racing
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Old 07-16-2001, 05:35 PM   #13
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Richer = higher performance? Tell your friend he has a flaw is his logic. Don't touch that pedal.

- Steve
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Old 07-17-2001, 02:34 PM   #14
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Give me a break! I posted this for people that had questios on resetting the ECU. There is a lot of bad information out there . This is how a dealer told me to reset the ECU. Also everything should be turned off!!! For precautionary reasons.

RacerinLSL I did say that was a good idea.

Jeff
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Old 07-17-2001, 03:01 PM   #15
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Sorry Legacy, I have a 2nd graders reading skills.

Chad
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Old 07-21-2001, 09:46 AM   #16
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I have done a reset many times and my car has never died on first startup. Does that mean I did something wrong or is it different in some cars?


Cameron
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Old 07-21-2001, 11:21 AM   #17
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Default Two things;

#1 If your ecu is retarding, it is trying to prevent detonation due to some unforseen circumstance that could be detrimental to your engine. Resetting constantly, allows your engine to BRIEFLY run in those unprotected parameters. Granted a bad tank of gas can be recovered from nicely.
#2 The ecu reset, the stuff of legends, does not truly apply to the normally aspirated. it trickled down from the scoobynet.co.uk (home of the 280+ bhp scoob) where it makes a big difference when done in MODERATION for such reasons as av or racing gas or a new mod that effects the intake tract. It is the general consesus that if you reset often, you are adding to the wear on your piston tops.
Don't believe? read the scoobynet.co.uk faq.The most complete consise and entertaining document on the net. Dan
P.S. This post is intended to stimulate intellectual conjecture.
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Old 07-21-2001, 12:46 PM   #18
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Default Voodoo...

I did a reset after finally removing my snorkus. I left the battery disconnected for multiple hours, didn't really keep track. Reconnected, reset the radio, fired it up. No stalling, no idling for 1/2 an hour. Ran fine right afterwards with normal driving and still is a week or so later. My understanding is that the ECU is continually collecting new data and adjusting itself. The reset is primarily to clear out the old, pre-mod data. I am a reasonably smart guy and I don't see what all the idling is supposed to buy you...

Doug
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Old 07-21-2001, 08:55 PM   #19
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ECU stands for Engine Control Unit(if you didn't already know).
The engine is the most important part of the car. Do you want to mess up your engine by not letting it do a complete warm up It is suppose to help the ECU determine what is the normal idleing conditions. Flooring it right off the bat will only put the ECU in Power mode. Which you can do by giving it heavy throtle a couple times while driving, if you want it in power mode(there is a power mode and an economy mode). This is the only reason you would feel a big gain in the performance after resseting the ECU. It will not run richer just because you gas it. If you want to have it run richer than get a Super AFC.

Jeff

If this sound rude. Sorry! I don't mean to sound rude.
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Old 07-22-2001, 02:03 PM   #20
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does the ecu reset affect the shifting patterns for a 4EAT or just engine behavior?
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Old 07-22-2001, 05:47 PM   #21
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Some time my naturally inspired impreza knocks when I start it up. Should I reset the ECU, or is there something more serious than that?

It seems to drive okay though, and it doesn't knock that often.
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Old 07-22-2001, 10:05 PM   #22
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lophilip, Try going to a higher octane. Often that is the problem.

SJT, It shouldn't affect the tranny at all.
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Old 07-22-2001, 11:00 PM   #23
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Quote:
Originally posted by Legacy SUS
SJT, It shouldn't affect the tranny at all.
Not necessarily true. While the ECU reset itself won't affect the transmission, the car also has a separate TCU, which will also get reset when you disconnect the battery. I don't know if this particular TCU has any learning capability, but it's certainly not outside of the realm of possiblity.
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Old 07-23-2001, 10:44 AM   #24
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Legacy SUS - Power & Economy mode?? Where'd you get that one?

Lophilip - Going to a higher octane gas is just hiding a more serious issue if your car is knocking when you start it. Our cars should run just fine day in and day out on 87 octane.

Chad
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Old 07-23-2001, 01:28 PM   #25
Legacy SUS
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AAAAAAA! There is a power mode and a normal(I called it economy) mode. I was told that by not only the dealership but also several people over at the Ultimate subaru message board. Somehow I think I would trust them over anyone here. The power mode just allows more fuel to be pumped thru. The ECU regulates the fuel running thru the engine and decides what you are trying to do.

Also when I bought my car, in the orientation meeting I was told if you are using low octane and it is knocking than try going to a higher octane. In many cases this will fix the problem. Here that? In many cases this will fix the problem. Also most mechanics will tell you this first before saying it is anything else.

I am not a mechanic but I do plan on being one.

Jeff.

Last edited by Legacy SUS; 07-23-2001 at 01:44 PM.
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