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> ECU reset questions answered
ricerrx7
post Jan 17 2006, 10:34 AM
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Many people ask about the ECU reset. What does it do? Is it really worth doing? Are there any negative effects? I think it's time to have a definitive guide to the ECU reset.

Why do we reset the ECU's?
The main reason we reset the ECU's in our cars is for more power. Plain and simple. Why? After a little while of driving, the ECU de-tunes the engine to satisfy the O2 needs of the cat. When you reset the ECU, it resets the fuel maps to a base value that's more suited to power.

Is this bad in any way?
Yes, it can be harmful. When you reset the ECU it changes the fuel maps, which is potentially harmful to the cats.

How often should I do it?
Only when you need the extra power. If you are going to race, dyno, or show off, these are the only times you should do the reset from a power standpoint.

How do I reset the ECU.
There's multiple theories about this. The time consuming way is to disconnect the negative battery terminal for 15 minutes, press the brake pedal, then reconnect the negative terminal. This method is fine if you want to wait around 15 minutes, and reset the clock, and the radio presets and settings. A simpler way is to pull the two fuses labeled "ECU" in the underhood fuse block. And the easiest way (after initial difficulty) is to hook up a switch; ECU reset switch DIY


Any more questions? Feel free to ask.

This post has been edited by ricerrx7: Jan 17 2006, 12:14 PM


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QUOTE (doc1987 @ Aug 29 2007, 02:33 PM)
call me a perfectsiotist but i...
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trololololo
post Jan 17 2006, 10:44 AM
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when i show off? its almost as paintstaking as opening the trunk to open your nitrous bottle.

lol. i guess i should look into that Switch DIY huh?

as far as "power" i do it because when i add a significant modification, i dont want it acting all crazy.. so start from the beginning. yes, the fresh start up feels pretty good and response is like new.


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southpawboston
post Jan 17 2006, 11:51 AM
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okay, since this topic comes up a lot, i'm pinning it. thumbsup.gif


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rickl115
post Feb 18 2006, 02:52 AM
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so what about if i disconnect only the positive. does it have the same effect?


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Seinster
post Feb 18 2006, 03:27 AM
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The correct procedure is to disconnect the ground (negative) terminal from the battery. This will make it safe for you to work on the electrics without inadvertently causing a short circuit which could immediately burn out your wiring (or worse).

This may sound strange to you. Why disconnect ground? Wouldn't it be more logical to disconnect the voltage carrying (positive) terminal from the battery? Well, there is a good reason. First: electrically speaking it does not matter which terminal you disconnect. When the circuit is broken no current can flow. It does not matter whether the circuit is open at the positive or at the negative terminal. BUT ... When you loosen the bolt or nut at the positive terminal of the battery you will need to use a spanner. When turning the (steel) spanner it may easily touch a metal part of the car body. That will create a massive short circuit! In fact you have now turned the battery and spanner into an arc-welding set-up with all the associated fireworks. I would strongly advise you not to try this. However when you first loosen the clamp on the ground terminal you can have the spanner touch the body of the car without any ill effect. The only thing to look out for is that it does not touch the positive terminal of the battery.

As for waiting 15 minutes, that's BS. It can be done in 2 minutes, just press the brake pedal multiple times to get rid of the residual current.
To really know if you have reset the ECU via this method, you'll see your guages go crazy when you put your key in and start her up.

Important thread though.


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ricerrx7
post Feb 18 2006, 09:32 AM
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I'm not sure what you mean seinster, the guages in my car do not go crazy when I reset the ecu. Also, there's no need to wait 2 minutes and press the brake pedal if you just pull the underhood fuses or hook up the switch...


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QUOTE (doc1987 @ Aug 29 2007, 02:33 PM)
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Seinster
post Feb 19 2006, 12:14 AM
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QUOTE
Also, there's no need to wait 2 minutes and press the brake pedal if you just pull the underhood fuses or hook up the switch...

I didn't mention those methods, having never tried them...

Note also, there is no need to 'wait', I meant the procedure with removing the terminal and pressing the brake pedal takes two minutes to do.

Regarding your guages not going crazy, perhaps this is only on the XD2's. Not really sure though.

As soon as I reconnect the neg.terminal, guages go vertical, or else they do a full swing, then after the car is started everything is back to normal. Scared the **** out of me the first time I did it. smile.gif


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Mobius1
post Apr 2 2006, 05:28 PM
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yeah can't say i've ever had my gauges do anything like that either but would be cool to see...well at least to me.


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DJ Hellfire
post Sep 5 2006, 08:20 PM
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I have one question on something that wasn't totally clear in the switch DIY. So, exactly which pin # is the blue power wire in the ECU harness? Is it pin 3?


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stauf
post Sep 9 2006, 03:17 PM
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So how many miles does it take the ecu to relearn the fuel maps...

I've heard different info on this subject for quite awhile now, so i'll take another opinion here.. =)


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ricerrx7
post Sep 9 2006, 03:26 PM
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DJ, seems that we lost the diagrams in the other tread, so that's something you'll have to look up on hmaservice.com.
Stauf, I believe that it takes 3 drive cycles for the effects of the reset to be lost.


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QUOTE (doc1987 @ Aug 29 2007, 02:33 PM)
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stauf
post Sep 9 2006, 03:29 PM
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Another thing I've never gotten a full answer to.. Define Drive Cycle.


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"Dusting is a good example of the futility of trying to put things right. As soon as you dust, the fact of your next dusting has already been established."

"I'm completely in favor of the separation of Church and State. My idea is that these two institutions screw us up enough on their own, so both of them together is certain death."

"Weather forecast for tonight: dark."
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