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How long does the battery have to be disconnected to reset the Computer?

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Old 07-21-2002, 02:11 PM   #1
TrplBlk01
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Default How long does the battery have to be disconnected to reset the Computer?

I have been told 3 differant time frames.
Anyone else have a opinion?
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Old 07-21-2002, 02:20 PM   #2
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Default Re: How long does the battery have to be disconnected to reset the Computer? (blk91)

15/20 minutes. Also, turning on the headlights will speed up the process.
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Old 07-21-2002, 03:49 PM   #3
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Default Re: How long does the battery have to be disconnected to reset the Computer? (STL94LT1)

How does having the headlights on help?
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Old 07-21-2002, 03:57 PM   #4
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Default Re: How long does the battery have to be disconnected to reset the Computer? (blk91)

I think someone is pulling your leg...15 - 20 minutes and turn on the headlights? :rolleyes:

There's an orange single wire atached to the positive cable AT the battery. Mine wasn't the easiest to find. It's a real tight fit, but if you can find it and disconnect it, leave it disconnected for 30 seconds. The nice thing about this method over the "disconnect the negative cable" method is that you don't have to reprogram your radio!

If you can't find it, then do the negative cable - again for about 30 seconds.
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Old 07-21-2002, 04:39 PM   #5
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Default Re: How long does the battery have to be disconnected to reset the Computer? (86VetteBill)

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Old 07-21-2002, 05:26 PM   #6
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Default Re: How long does the battery have to be disconnected to reset the Computer? (DragMan)

it shouldnt take any more than a minute for any current to be out of the system
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Old 07-21-2002, 08:52 PM   #7
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Default Re: How long does the battery have to be disconnected to reset the Computer? (vader86)

I agree, it only take a few minutes. the headlight thing is a good one!

BG
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Old 07-21-2002, 09:06 PM   #8
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Default Re: How long does the battery have to be disconnected to reset the Computer? (blk91)

Quote:
Anyone else have a opinion?

Hey guys, he asked for opinions, not scientific fact.

I know it is not a GM product, but when I bought a computer chip for my truck from a highly respected Ford tuner. He told me to disconnect the negative battery terminal for 20 minutes and turn the lights on before installing the chip. He said by turning on the lights it would drain any current in the system.
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Old 07-21-2002, 09:37 PM   #9
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Default Re: How long does the battery have to be disconnected to reset the Computer? (blk91)

My reference, "Chevy Fuel Injection" by Ben Watson, says to remove battery voltage to the ECM ( by whatever method you chose) for 30 sec to reset the codes.

If it causes the ECM to lose stored codes it will also lose all learned presets as they are all stored in RAM with needs power to retain data.

That's my story, and I'm stinking to it! :D
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Old 07-21-2002, 09:57 PM   #10
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Default Re: How long does the battery have to be disconnected to reset the Computer? (STL94LT1)

The headlights bit would be a way to insure you discharged any stored voltage stored by capacitance in the electrical system. Not really a bad idea to insure complete discharge of any and all stored micro voltage in the electrical system. Turning anything on would do it though, radio, ignition key, headlights, brake pedal, etc.
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Old 07-21-2002, 10:04 PM   #11
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Default Re: How long does the battery have to be disconnected to reset the Computer? (Lone Ranger)

Well that might work unless you open that orange wire (my method too) or pull the ECM fuse.

In that case you could touch the orange wire (from the ECM) to ground to discharge any stored charge.
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Old 07-22-2002, 12:49 AM   #12
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Default Re: How long does the battery have to be disconnected to reset the Computer? (blk91)

The only reason to wait for any amount of time is due to the fact that the ECM has large bypass capacitors on the 12 v line and they must discharge to remove any data in storage. Touching the ECM wire to ground (make sure its not the one going to the battery) will discharge those capacitors and reset the computer.
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