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 Proper Produce To Reset Ecu
 
94eclipse
post May 31 2005, 09:46 PM
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I'd like to know what is the proper way to reset the ECU. Will just disconnecting the negative terminal on the battery do it or will I have pull a fuse or something?
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patsevo8
post Jun 1 2005, 10:33 AM
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Disconnect both sides of the battery. What is it you're trying to accomplish?
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mittech
post Jun 1 2005, 11:10 AM
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The proper way to clear codes is with a scan tool. If you disconnect the battery you may loose the engine settings possibly lowering the idle and causing stalling.
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patsevo8
post Jun 1 2005, 12:13 PM
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That's an extreme situation. I don't feel if he does it the disconnect way that he'll really run into any issues.
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mittech
post Jun 1 2005, 01:15 PM
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If the engine specs have not been set for a long time the ecu will normally lose them.
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eclipsed4utoo
post Jun 1 2005, 03:33 PM
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what would be considered a long time?
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patsevo8
post Jun 2 2005, 03:49 PM
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I've never heard of anything like that before. What do you mean if the engine hasn't been set for a long time?
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mittech
post Jun 3 2005, 08:40 AM
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Idle settings should be set at every tune up as the motor wears and carbon builds up in the throttle body and intake the idle will lower.
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eclipsed4utoo
post Jun 3 2005, 09:42 AM
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well whats a long time....a week, month, 6 months, year, 5 years?
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mittech
post Jun 3 2005, 11:41 AM
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It all depends on the maintenance, plugs, filters,etc. The more up to date you are on maint. the less likely it will mess anything up.I have seen alot of people replace batteries and the car will start idling low.
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patsevo8
post Jun 3 2005, 11:45 AM
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I'm going to dig at that for a while, cause I have never heard of such a thing. Interesting.
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mittech
post Jun 3 2005, 11:59 AM
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Well I have been working for mitsubishi dealers since 1997 and it happens alot. I work on at least 50 mitsus a week.
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patsevo8
post Jun 3 2005, 02:55 PM
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I can see how it would effect it, but I have never seen it. Interesting.
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((Vibe))
post Jul 16 2008, 12:57 PM
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Sorry to bump a (very) old thread

QUOTE
If the engine specs have not been set for a long time the ecu will normally lose them.


I was wondering, how do you go about "resetting" the engine specs? Does the car do this on it's own? Or do you have to go get a tune up?
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pwee05
post Jul 16 2008, 01:13 PM
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:00000732:


No worries about bumping an old thread, it's a very good question and it shows you are searching :beer: :clap:

your ECU is pre-programmed from the factory and will never lose it's programming unless it is damaged.

re-programming or "flashing" an ECU allows a tuner to hook the ECU up to software and adjust the factory settings to match upgrades such as larger fuel injectors, bigger turbo, etc
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