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How long does the battery have to be disconected?

 
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Old 20 Jul 2002, 01:13 pm
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Default How long does the battery have to be disconected?

How long does the battery have to be disconected for your ecu to pick up any changes done to the car(air intake exhaust..etc)? thanks
paul

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Old 20 Jul 2002, 10:35 pm
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Paully,
It's not the length of time that it's disconnected that counts. Just being disconnected for a moment will clear most of what the computer has learned about your car. When you start it up again, then the computer starts re-learning the proper settings, and if you have added some mods, the computer will learn about them also. It might stumble a bit at first when you restart the car as it's learning the new settings, but just drive it like you will everyday and hopefully if you were having problems, they will disappear, but if your just doing it to re-learn new mods, they will be re-programmed in the learning process.

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Old 06 Jun 2013, 12:06 pm
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Default Re: How long does the battery have to be disconected?

BTW : There is a general "re-learn" procedure that should speed up the process.

http://my.cardone.com/techdocs/PT%2077-0007.pdf

The computer must go through a relearn procedure after battery is
disconnected. For the specific relearn procedures, refer to O.E. service
bulletins or a repair manual for your vehicle. If a specific relearn procedure
is not available, the following procedure can be used:

1. Firmly apply the parking brake and block the drive wheels to prevent
possible movement of vehicle.

2. Start and run engine in neutral to normal operating temperature or until
cooling fan cycles.

3. Automatic transmission:
Allow engine to idle in neutral for at least one
minute, then in drive for at least one minute.

Manual transmission:
Allow engine to idle in neutral for at least one minute.

4. Road test vehicle at various speeds in excess of 35 m.p.h.
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Old 06 Jun 2013, 12:37 pm
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Default Re: How long does the battery have to be disconected?

If it were that easy!!
The MOPAR ECU in the PT Cruiser will hold pending codes pretty much until your either scan clear them, correct the cause or both or the routine of self clearing has cycled through. Just because you think they are gone by doing the battery disconnect does not mean the anomaly was corrected that caused them. A long time "myth" about this. I have read that many no longer see some codes by doing the disconnecting of the battery. But really had they drove the car a few more time those codes would have cycled and self cleared anyway. Myths are funny how they come about? LOL

There is no re-learn on the PT Cruiser ECU for having it disconnected for any length of time. Now if you change the ECU then there are different procedure to follow?

And what is this none sense about PT Cruiser ECU having AI (artificial intelligence)abilities....

The ECU does not "learn" it simply applies the new data input and adjust the same way as if you decided to take the family for a drive and every body weigh 200+ lbs 5 passengers 1000lbs plus a full tank of fuel 315lbs and you were going up a 5000+ft= mountain, the ECU would retard the timing and increase the fueling within its limitations to compensate for the new engine load ? And you will most likely go very slow anyway? It is not learning but correcting applications it controls within a pre-program design with limitation. Not learning! If it were learning as an example when you install larger fuel injectors you would not need to change the duty cycle and/or scale them to work. Hmm.... ECU wasn't learning there?
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Last edited by NitroPT; 06 Jun 2013 at 12:50 pm.
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Old 06 Jun 2013, 11:19 pm
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Default Re: How long does the battery have to be disconected?

Quote:
Originally Posted by NitroPT View Post
If it were that easy!!
The MOPAR ECU in the PT Cruiser will hold pending codes pretty much until your either scan clear them, correct the cause or both or the routine of self clearing has cycled through. Just because you think they are gone by doing the battery disconnect does not mean the anomaly was corrected that caused them. A long time "myth" about this. I have read that many no longer see some codes by doing the disconnecting of the battery. But really had they drove the car a few more time those codes would have cycled and self cleared anyway. Myths are funny how they come about? LOL

>Now, being a total newbie... I appreciate the education. thanks!
>I get that onboard CPU is a dumb box. Reactive not proactive. So be it.
>What does the 3 key turn get you? The most recent 1 of 50 stored codes?
>Can whatever # of stored codes be accessed for analysis?

There is no re-learn on the PT Cruiser ECU for having it disconnected for any length of time. Now if you change the ECU then there are different procedure to follow?

> I suppose the adaptive mythology may come from the aftermarket boxes >and chips that are programmable, etc etc. "tunes" and all that...
>

And what is this none sense about PT Cruiser ECU having AI (artificial intelligence)abilities....

The ECU does not "learn" it simply applies the new data input and adjust the same way as if you decided to take the family for a drive and every body weigh 200+ lbs 5 passengers 1000lbs plus a full tank of fuel 315lbs and you were going up a 5000+ft= mountain, the ECU would retard the timing and increase the fueling within its limitations to compensate for the new engine load ? And you will most likely go very slow anyway? It is not learning but correcting applications it controls within a pre-program design with limitation. Not learning! If it were learning as an example when you install larger fuel injectors you would not need to change the duty cycle and/or scale them to work. Hmm.... ECU wasn't learning there?
>yeah, reactive not proactive. Do the aftermarket boxes allow more >interaction?

Thanks again!
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Old 07 Jun 2013, 12:02 am
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Default Re: How long does the battery have to be disconected?

Quote:
Originally Posted by oldPTdude View Post
>yeah, reactive not proactive. Do the aftermarket boxes allow more >interaction?

Thanks again!


>What does the 3 key turn get you? The most recent 1 of 50 stored codes?
I have not actually not taken time when working on someone PT to use this method of viewing codes and/or pending codes however if I had to guess I would say that this only will show active code(s) and not a pending code(s)?

>Can whatever # of stored codes be accessed for analysis?
Any Diagnostic technician can scan and access any and all engine management operating perimeters permitted through the OBDII port. Now having that information and knowing how to analysis it is a matter of training and experience.



> I suppose the adaptive mythology may come from the aftermarket boxes >and chips that are programmable, etc etc. "tunes" and all that...
Your statement is partial accurate but there is a lot more to it then this. chips and most plug and plays are not "adaptive,and many stand alones also need to be programmed and adjusted as needed which technically means they are also not adaptive. In this case you get what you pay for and "adaptive" stand alone engine management systems that are considered slightly adaptive cost between $3-10,000.
>
As an example of an "adaptive" engine management system BMW has one of the most technically advanced stock ECU around. It adapts to the driver and engine operating conditions which may be one example where some have since called it "learned" abilities on the part of generally all ECU but is not the case? BMW also spent about 1 million dollars using advance 3d algorithm technology to design their ECU which most auto makers have not done that kind of investment with their engine management systems.

For after market stand alone ECU's any that have "adaptive" capabilities are the ones to consider.

Sorry to say that our PT's PCM/ECU is dumb as a door and needs to be adjusted to anything out of its pre-program range of engine management.So to say.
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Last edited by NitroPT; 07 Jun 2013 at 12:18 am.
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