what happens when you disconnet your battery completly, does it do anything to your ecu, just a general question

Quote: Originally Posted by IMFSTR what happens when you disconnet your battery completly, does it do anything to your ecu, just a general question as Niche said... Quote: Originally Posted by Niche Its possible sure, depends on whether any battery backed non volatile memory is used or if eeprom is used it glitched during a power up/down. Most likely is that leaving a system unpowered over 12 months results in minor corrosion of connectors, suggest unplug and plugin all connectors a dozen times or so just to "exercise" them, edit: Any analog sensors like AFM, MAP, CTS are first things to check as ECU really really needs a stable and clean signal there to base all its maps on... depends on what ecu ou have, standard you will be fine. you may loose ur cd players settings etc. a possible way to avoid cd players, ecu's etc forgetting them selfs is join a cigar lighter plug to 9v batter clip socket and then plug a 9v battery into ur cigar lighter socket and quickly change over bats. this should keep just enough current in the system to keep the memoray of cd players etc charged.

disconnecting the battery wont do anything to the computer...

Car is running fine now. ECU tuning has not changed as car run as it did 12 months ago. thanks to all that replied to my questions has been good reading and informative. my problem ended up being a fuel issue.

OK SWEET .. LAST ONE I THINK ... if i was jump starting somone els's car with my batary would thats effect/fry the ecu.