Reseting the ECU

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06-11-2002, 12:39 PM

2001SE

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Reseting the ECU

If i do it when nothing is wrong...does it hurt anything? will it change something once i reset it?

06-11-2002, 01:30 PM

MaDxKiLLa

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it just sets everything back to the way it was...like time gets messed up and your radio settings thas all

06-11-2002, 03:21 PM

2001SE

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is it right that the ECU sees the way you drive and changes itself to the way you drive?

06-11-2002, 03:59 PM

MaDxKiLLa

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Quote:

Originally posted by 2001SE
is it right that the ECU sees the way you drive and changes itself to the way you drive?

i dont think so

06-11-2002, 04:02 PM

y2kse

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Quote:

Originally posted by MaDxKiLLa

i dont think so

Actually, your ECU does learn your driving habits and it adjusts itself accordingly. In a recent writeup in Sport Compact Car on a stock Subaru WRX, the WRX lost 10 hp when the ECU was reset. The reason was because the vehicle had been driven for several days through Wyoming and Montana at speeds consistently exceeding 135 mph! When the ECU was reset, the default driving conditions were restored. There's a dyno plot in the article that proves the point.

The moral of the story is, the harder you thrash your engine, the more power it will generate. The downside, of course, is greater wear and tear on the engine. But hey, it's covered under warranty, right?

06-11-2002, 04:05 PM

MaDxKiLLa

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icic...well yea the ECU goes back to original though when you reset it....

06-11-2002, 04:08 PM

y2kse

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Quote:

Originally posted by MaDxKiLLa
icic...well yea the ECU goes back to original though when you reset it....

Right. Which means that you get to teach it all over again.

06-11-2002, 04:09 PM

2001SE

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i see that the tranny doesn't act the same as when i first had the car...it changed, the way it moves gears and how it reacts and all. So if i reset it, will it change again and the MPG will go up? because the engine is using less fuel for harsh driving?

06-11-2002, 04:09 PM

MaDxKiLLa

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Quote:

Originally posted by y2kse

Right. Which means that you get to teach it all over again.

smart guy

06-11-2002, 04:11 PM

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MaDxKiLLa

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Quote:

Originally posted by 2001SE
i see that the tranny doesn't act the same as when i first had the car...it changed, the way it moves gears and how it reacts and all. So if i reset it, will it change again and the MPG will go up? because the engine is using less fuel for harsh driving?

i dunno why but ever since i reseted my ECU my MPG got horrible....its wierd....y2kse why do you think its doing that?

06-11-2002, 04:14 PM

#11

xChungHsienx

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Quote:

Originally posted by MaDxKiLLa

i dunno why but ever since i reseted my ECU my MPG got horrible....its wierd....y2kse why do you think its doing that?

opposite for me...before ecu reset 18.2-18.3 now about 21.0 How come max's mpg varies so much. i heard of some people getting 27-28 mpg or even more.

Chung-Hsien

06-11-2002, 04:31 PM

#12

y2kse

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Quote:

I could say "it should" and be dead wrong, 2001SE. I'm not an engineer and I really don't know how the ECU goes about the process of learning your driving habits. I just know that it does go through that process.

06-11-2002, 04:48 PM

#13

2001SE

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how long will it take it to relearn my driving habits?

06-11-2002, 04:53 PM

#14

y2kse

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Quote:

Originally posted by 2001SE
how long will it take it to relearn my driving habits?

I really can't answer that question. Does anybody know? Kevin?

06-11-2002, 05:15 PM

#15

2001SE

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i started noticeing it a few thousands miles after i drove it.

i am getting now usually around 18mpg like all the time mixed highway and city. should i reset it and see if i get a better gas mileage?

you think i will loose signifcant amount of power?

06-11-2002, 05:19 PM

#16

y2kse

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Quote:

Originally posted by 2001SE
i started noticeing it a few thousands miles after i drove it.

i am getting now usually around 18mpg like all the time mixed highway and city. should i reset it and see if i get a better gas mileage?

you think i will loose signifcant amount of power?

Go ahead and reset it, 2001SE. You probably won't notice any significant difference in power.

06-11-2002, 05:40 PM

#17

2001SE

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alright man...so, its just disconnecting the negitive cable from the battery for a few hours(i'll leave it over night)?

06-11-2002, 05:48 PM

#18

y2kse

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If you want to make certain that your ECU is completely reset, you'll need to leave the battery disconnected for 24 hours. If you can't do that, at least disconnect it overnight.