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Old 05-14-2007, 06:40 PM   #1
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Flashing the PCM

I read the faq about flashing the PCM and had a question for anyone who can answer it. I own a 2001 SE with an automatic trans. and the 2.5L 4 cyl. I am the second owner of my Jeep. My question is this: Would it be wise to flash the PCM and have it 'learn' my driving style? Would it possibly help fuel economy?

Thanks in advance,

James

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Old 05-14-2007, 06:44 PM   #2
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Maybe but it doesn't require the dealer to "flash" it which is when they reprogram it. All you need to do is disconnect the battery for several minutes to reset the computer. Then, drive it as aggressively as you feel you must to help it to learn your particular parameters. It will relearn your driving style over about the next two weeks, be prepared for it to possibly run a little differently in the beginning.

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Old 05-14-2007, 06:49 PM   #3
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Unless you know how the previous owner drove, and your driving habits are radically different from his/hers, I doubt you would have any noticeable difference in fuel economy. Hey, it can't hurt. Try it.
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Old 05-14-2007, 06:50 PM   #4
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Thanks for the answer, but it gave me another question....in the faq it gives a list of things to do in a certain order to clear it. Is all of this:
Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. (This is to discharge the PCM capacitors, which maintain the Adaptive Memory.
Reconnect the Battery Cable
Turn Ignition Switch to the “On” position but DO NOT start the engine
Turn Headlight “On”
Turn Headlights “Off”
Turn Ignition Key “Off”

not necessary?
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Old 05-14-2007, 06:51 PM   #5
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Originally Posted by Dare2BSquare View Post
Unless you know how the previous owner drove, and your driving habits are radically different from his/hers, I doubt you would have any noticeable difference in fuel economy. Hey, it can't hurt. Try it.
I don't know much about the previous owner except that he's about 20 years older than me, which could mean we drive radically different or it could mean nothing....
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Old 05-14-2007, 07:17 PM   #6
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Quote:
Originally Posted by blownfanswitch View Post
Thanks for the answer, but it gave me another question....in the faq it gives a list of things to do in a certain order to clear it. Is all of this:
Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. (This is to discharge the PCM capacitors, which maintain the Adaptive Memory.
Reconnect the Battery Cable
Turn Ignition Switch to the “On” position but DO NOT start the engine
Turn Headlight “On”
Turn Headlights “Off”
Turn Ignition Key “Off”

not necessary?
You could do all that (which is just silly major overkill IMHO) or just wait the couple minutes I suggested after disconnecting the battery's negative lead. Either method effectively and equally discharges the capacitors that hold a small temporary charge that keep the computer memory alive.
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Old 05-15-2007, 10:57 AM   #7
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Thanks, man. I think it might be a little beneficial in the long run, but I'm just gonna leave it alone...it'd be my luck i'd fry my computer.
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Old 05-15-2007, 11:12 AM   #8
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Originally Posted by blownfanswitch View Post
Thanks, man. I think it might be a little beneficial in the long run, but I'm just gonna leave it alone...it'd be my luck i'd fry my computer.
No way, it's done all the time, it's easy to do, and there is (again) NO WAY you could fry the computer doing this. Heck, it's the same thing as when you get your battery replaced and it's disconnected for the length of time it takes for the new battery to be installed. No, there is no chance this will harm the computer in any way at all. Just disconnect the battery's negative lead for a couple minutes and then reconnect it. You're done.
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Old 05-15-2007, 07:42 PM   #9
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so does this mean that when your battery runs dead that the computer will reset itself or does the lead have to be totally disod?
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Old 05-15-2007, 07:56 PM   #10
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Make sure the cd player doensnt have the lock code junk.. i know my 00 tj doesnt but the other day i worked on another rig that did (not a wrangler). I dont know if any newer tjs do also. Lucky we replaced the cd player with an aftermarket.

Disconecting the battery will lock the cd player if it has a lock.
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Old 05-15-2007, 08:06 PM   #11
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so does this mean that when your battery runs dead that the computer will reset itself or does the lead have to be totally disod?
If the battery goes completely dead, yes the computer is reset then too. Ya see, it's no big deal to reset your computer.

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