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The truth about resetting the ECU. Is it out there?

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Old 01-25-2009, 02:58 PM
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The truth about resetting the ECU. Is it out there?

Guys, lets try to have a definitive discussion about just exactly how, why, and when to reset the G35's ECU. Don't chime in unless you REALLY know the answer to this.

Let's start with how. We have seen two popular methods: one involving doing a song and dance with the pedals, etc. And the other being quite simple involving disconnecting the battery for a period of time.

Questions are numbered so your replies should reference the numbers. This will allow us to answer specifically the questions you know the answers to.

--------------------------------------------------------------------------------------

1) What parameters are reset within the ECU?

2) Do the two methods mentioned above do exactly the same thing?

3) When should one reset their ECU?

4) If the pedal method and battery disconnect method DO in fact do exactly the same thing then what is the correct period of time the battery needs to be disconnected?

5) If one has aftermarket tuning done to the car, i.e. Cobb Accessport, UpRev Osiris, Technosquare, etc. is a ECU reset EVER necessary or possible damaging to the tuning?
Old 01-25-2009, 03:58 PM
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The only one that's ever worked for me is the battery disconnect, like when
installing spacer or intake. (like the instructions say) I've tried the other
method, even had a stopwatch in hand to get the timing correct and it never
seemed to work.... LOL
Gary
Old 01-25-2009, 04:06 PM
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Yeah I've never even tried that song and dance one, seems hokey but somepeople seem to think it works well enough.
Old 01-25-2009, 04:35 PM
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Quote:
Originally Posted by lekker_droom View Post
Yeah I've never even tried that song and dance one, seems hokey but somepeople seem to think it works well enough.
Worked for me to clear a CEL countless times
Old 01-25-2009, 05:03 PM
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Quote:
Originally Posted by Glex25 View Post
Worked for me to clear a CEL countless times
So back to the original post, any idea if the method you used is different than the battery disconnect method?
Old 01-25-2009, 05:12 PM
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I've done the pedal one several times and I've gotten good at it.. I'll get it on my first try every time..

The only difference I know of between the pedal dance and the battery disconnect is that the battery reset is supposed to be considered the "hard reset" whereas the pedal dance is considered the "soft reset"

The soft reset will only reset what the ECU has learned from your driving styles..

The hard reset will mess up your radio presets and I "think" your trip meter.
Old 01-25-2009, 05:15 PM
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Originally Posted by officerdbag View Post
I've done the pedal one several times and I've gotten good at it.. I'll get it on my first try every time..

The only difference I know of between the pedal dance and the battery disconnect is that the battery reset is supposed to be considered the "hard reset" whereas the pedal dance is considered the "soft reset"

The soft reset will only reset what the ECU has learned from your driving styles..

The hard reset will mess up your radio presets and I "think" your trip meter.
Good info dbag. Now the battery disconnect, what's the appropriate time to leave it disconnected? DO you gus disconnect positive and negative terminals or just he neative?
Old 01-25-2009, 05:21 PM
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From what I've heard and read on several diffent car forums.. You leave the negative terminal for about 10 hrs, I've also heard 5 hrs.

As for why you do the negative terminal, I have no clue.
Old 01-25-2009, 05:23 PM
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Quote:
Originally Posted by lekker_droom View Post
Good info dbag. Now the battery disconnect, what's the appropriate time to leave it disconnected? DO you gus disconnect positive and negative terminals or just he neative?
I only disconnect the positive. The negative is grounded directly to the car right next to my battery.
Old 01-25-2009, 06:32 PM
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lol tag
I don't suppose you had anything to do with it, huh?
Old 01-25-2009, 07:13 PM
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ECU Hardset....must be a morning thing! LOL

I've always done the negative side and have never left it off for more
than 2 hours. (spacer install) I suppose if you want to make sure everything
is cleared disconnect it at night and reconnect it in the AM. Now you can
set the clock and have fun finding all your favorite stations....again.
Gary
Old 01-25-2009, 07:15 PM
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OK, I did the terminal disconnect for like an hour or so, went out connected it all up, started the car and let it run for about a minute.

Then I did the pedal reset and IT ACTUALLY WORKED. Pretty cool!

MotorDyne has it on their site.

Click the link for the PDF. It's the last page of the PDF.

Old 01-25-2009, 07:32 PM
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Pedal reset worked for me when passenger airbag light came on.

Reset it, and it never came back.

I rarely carry a passenger, so it seemed a safe risk to see if the error would come back.

I've never done the battery disconnect.
Old 01-25-2009, 09:52 PM
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What are the advantages of doing this? Do u get anymore performance?

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2000, 2004, a6, accessport, audi, battery, codes, disconnecting, ecu, engine, g35, infiniti, meter, p0420, p0430, reset, resetting, terminal, trip
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