Replacing the battery L98 1989
07-17-2011, 06:03 PM
#1
2nd Gear
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Replacing the battery L98 1989
Does the "computer" need be reset when changing the battery.
When disconnecting the battery?
What "computer" is this that neds a "reset?
Can this "reset" be avoided by changing the battery while the ngine is running?
When disconnecting the battery?
What "computer" is this that neds a "reset?
Can this "reset" be avoided by changing the battery while the ngine is running?
07-18-2011, 12:07 AM
#4
Race Director
Seriously, the computer (aka ECM) clears memory w/o electricity. As mentioned above, it will "relearn" what it needs within a few minutes of driving. (It relearns the small changes necessary to optimize fuel injection for lowest emissions). Also, you might have to re-enter your radio station presets. NO BIG DEAL!
Do it right and change the battery with the car OFF!
07-18-2011, 12:31 AM
#5
Don't ever change a battery in a vehicle with the engine running.
The 12 volt battery acts like a filter- buffer for AC Ripple current that leaks past the Full wave rectifier bridge inside of the alternator.
And the alternator voltage regulator will be confused & likely put out over 18 VDC + back to the ignition system, And ECM- PCM and any other electronic devices in your C4.
Cost yourself alot of uneaded headaches and $$ expense in hurry otherwise.
BR
The 12 volt battery acts like a filter- buffer for AC Ripple current that leaks past the Full wave rectifier bridge inside of the alternator.
And the alternator voltage regulator will be confused & likely put out over 18 VDC + back to the ignition system, And ECM- PCM and any other electronic devices in your C4.
Cost yourself alot of uneaded headaches and $$ expense in hurry otherwise.
BR
07-18-2011, 03:55 AM
#7
Burning Brakes
I saw one guy replace his battery with the motor running just to see if he could pull it off. He used a battery charger. I told him he was lucky he didn't die.
