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proper way to reset or clear the computer?

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Old 10-04-2008, 08:54 PM   #1
mustanglouie
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Default proper way to reset or clear the computer?

I was wondering what is the proper way for completely resetting the computers in our cars?
I have heard a couple different theories. One is to just take off the neg. terminal and let the car sit for about 30 mins and then put it back on. But does this completely wipe out the memory of the computer? I have also heard that you could take the pos. and neg. terminals off the battery and touch them together for a few mins and that would completely wipe out the memory of the computer. So what is the correct way to completely clear the entire memory on our cars without hurting them?
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Old 10-04-2008, 09:42 PM   #2
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it seems to me, that you need the:

Rotunda Worldwide Diagnostic System (WDS), Vehicle Communication Module (VCM) with
appropriate adapters or equivalent diagnostic tool.


here's a copy and paste from the service manual:


Resetting The Keep Alive Memory (KAM)
Description
Resetting the KAM returns the powertrain control module (PCM) memory to its default setting. Adaptive learning contents such as idle speed, refueling event, and fuel trim are included. Clear the continuous diagnostic trouble codes (DTCs) in the PCM and reset the emission monitors information, is part of a KAM reset. Refer to Clear the Continuous Diagnostic Trouble Codes (DTCs) and Reset the Emission Monitors Information in the Powertrain Control Module (PCM) in this section. Both can be useful in post-repair testing.

After the KAM has been reset, the vehicle may exhibit certain driveability concerns. It is necessary to drive the vehicle to allow the PCM to learn the values for optimum driveability and performance.

This function may not be supported by all diagnostic tools. Refer to the diagnostic tool manufacturer's instruction manual.

If an error message is received or the diagnostic tool does not support this function, disconnecting the battery ground cable for a minimum of 5 minutes may be used as an alternative procedure.

Last edited by hammeron; 10-04-2008 at 09:56 PM.
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Old 10-04-2008, 10:03 PM   #3
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^^ or simply disconnect the battery for a few minutes. It really wont damage anything. If they got damaged that way, ford would have to replace ecu's daily, since many people drain their batteries and need a jump start.
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Old 10-05-2008, 12:01 AM   #4
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Default RESET

Just take off positive side for 10-15 minutes.

Don't touch them together

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Old 10-05-2008, 03:31 AM   #5
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Quote:
Originally Posted by Cloewe06 View Post
Just take off positive side for 10-15 minutes.

Don't touch them together

cloewe
even though, it doesnt really matter. Usually its better to remove the negative instead of the positive, causes less sparking but either way it works.
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Old 10-08-2008, 03:02 PM   #6
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Default Clearing computer

After you disconnect either of the battery cables, step on the brake pedal for a few seconds. That will make sure you pull all the power out of the system. Also it is better to remove the negative cable to avoid sparking.

I've never heard of touching the positive and negative terminal together.

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Old 10-08-2008, 04:20 PM   #7
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I believe the sparking referred to above has to do with removal and reconnection of either terminal to the battery. When I disconnect the battery, I use the negative and there's been no sparking. But that's how I've always done it...

Surprisingly, the only thing I've ever had to reset was the clock. Even my radio stations all came back.
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Old 10-08-2008, 04:36 PM   #8
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Quote:
Originally Posted by Nuke View Post
I believe the sparking referred to above has to do with removal and reconnection of either terminal to the battery. When I disconnect the battery, I use the negative and there's been no sparking. But that's how I've always done it...

Surprisingly, the only thing I've ever had to reset was the clock. Even my radio stations all came back.
+1. that was very ftw.
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Old 10-08-2008, 04:58 PM   #9
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I know this sounds stupid... but what does ftw mean?
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Old 10-08-2008, 05:04 PM   #10
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FTW = For The Win. I agree, I've also always simply unconnected the neg battery cable and let the car sit for a few minutes. I've already done it on my current car and worked fine, didn't hurt anything.
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Old 10-09-2008, 12:58 AM   #11
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my one friend that used to be a mechanic told me that you can't clear the computer fully cuz the dealer has something that they can look back in it and see all the history and check to see if people have installed a supercharger or changed the tune or something and never said anything about it when they get cars back from a lease or whatever, even if you reset it and uninstalled the tune and disconnected the battery.. but idk if he's right or not
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Old 10-09-2008, 06:51 AM   #12
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Personally, I dont give a flying f**k about the dealer and him determining what I did with my car. It's my car and I'll do what I want. IF and WHEN a warranty issue comes up, I'll fight that battle then. They have to prove that your mod caused the problem in order to legally deny you warranty work. Let's stop worrying about that crap and do with these cars what we bought them for... Lot's of wood.
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Old 10-09-2008, 04:07 PM   #13
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Quote:
Originally Posted by EMichael View Post
my one friend that used to be a mechanic told me that you can't clear the computer fully cuz the dealer has something that they can look back in it and see all the history and check to see if people have installed a supercharger or changed the tune or something and never said anything about it when they get cars back from a lease or whatever, even if you reset it and uninstalled the tune and disconnected the battery.. but idk if he's right or not
He is wrong in the case of the 05-09 S197s.
No looking back at if and when the tune was
changed after a 20 min negative battery cable
disconnection....

Dont know about other makes or models.



Quote:
Originally Posted by volcomchester18 View Post
even though, it doesnt really matter. Usually its better to remove the negative instead of the positive, causes less sparking but either way it works.
WTF? It doesnot matter????
Its best to unhook the negative cable first because the vehicle is
negative ground. If you touch the wrench to the body when unhooking
the ground first, nothing happens. Unhook the positive first and accidentally
ground the wrench to the body and the battery has a chance of exploding
in your face and its not pretty.
Just had to jump in there and save someones eyesight.
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Last edited by 157dB; 10-09-2008 at 04:12 PM.
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Old 10-09-2008, 04:12 PM   #14
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The battery won't explode but the arc from dead-shorting the battery will make you THINK it did...
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Old 10-09-2008, 04:36 PM   #15
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Quote:
Originally Posted by 157db View Post
He is wrong in the case of the 05-09 S197s.
No looking back at if and when the tune was
changed after a 20 min negative battery cable
disconnection....

Dont know about other makes or models.





WTF? It doesnot matter????
Its best to unhook the negative cable first because the vehicle is
negative ground. If you touch the wrench to the body when unhooking
the ground first, nothing happens. Unhook the positive first and accidentally
ground the wrench to the body and the battery has a chance of exploding
in your face and its not pretty.
Just had to jump in there and save someones eyesight.
dude, batteries dont just explode that easily. Its like safety precaution to do negative so you minimize sparking around the battery.
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Old 10-09-2008, 04:49 PM   #16
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as long as you have a sct x-cal the dealer only sees that the battery went dead, same codes pulled, and all the memory has been reset. i think ive heard the diablosports/predators dont have that ability. that the dealer can see that the car was re-tuned.
makes it easy when service advisor asks why battery died so much just say you park for a few weeks at a time and disconnect the battery so it doesnt drain.
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Old 10-09-2008, 06:57 PM   #17
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Quote:
Originally Posted by shoeys08dkcandygt View Post
as long as you have a sct x-cal the dealer only sees that the battery went dead, same codes pulled, and all the memory has been reset. i think ive heard the diablosports/predators dont have that ability. that the dealer can see that the car was re-tuned.
makes it easy when service advisor asks why battery died so much just say you park for a few weeks at a time and disconnect the battery so it doesnt drain.
so are you sure that if I return my tune to stock with sct x-cal scanner it wont show as re-tuned at dealer. Or just to be safe I should take negative out?
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Old 10-11-2008, 10:22 AM   #18
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Get your wedding band inbetween the positive
treminal/wrench connection and ground. It
will promptly turn bright cherry red hot and
remind you everyday of what you did.
Unless you follow proper procedure and remove
the NEGATIVE cable first and replace it last when
reinstalling the battery.


Quote:
Originally Posted by volcomchester18 View Post
so are you sure that if I return my tune to stock with sct x-cal scanner it wont show as re-tuned at dealer. Or just to be safe I should take negative out?
They will be able to tell the last time the tune was changed.
YOU MUST REMOVE THE NEGATIVE BATTERY CABLE FOR @20
MINUTES AND ALLOW THE ADAPTIVE LEARNING TO RELEARN
THE STRATGIES, then there will be No Trace of when
the tune was last modified but it will show time from
last power-up. Claim the dreaded dead battery syndrome
these S197s seem to have but I have yet to experience.
If you always have very low time on the run clock when
you take her in for service and the adaptive learning is still
learning, they might get wise but cant prove anything
warranty voiding wise. Claim dead battery, dead battery....
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Last edited by 157dB; 10-11-2008 at 09:10 PM.
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Old 10-11-2008, 10:44 AM   #19
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Removal: Negative then Positive
Application: Positive then Negative
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Old 10-11-2008, 01:46 PM   #20
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Quote:
Originally Posted by 157db View Post
Get your wedding band inbetween the positive
treminal/wrench connection and ground. It
will promptly turn bright cherry red hot and
remind you everyday of what you did.
Unless you follow proper procedure and remove
the NEGATIVE cable first and replace it last when
reinstalling the battery.
yeah man, I did it once, dropped a wrench. Man that was insane. haha
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Old 10-11-2008, 01:46 PM
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