Civic Coupe VTI 1999.
If car has been remapped, will disconnecting battery for a long time cause any remaps to be reset?
asked Sep 30, 2020 at 9:26
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1 Answer
No, it shouldn't. During a remap, there are tables which the ECU reads to know what/when/how fueling and other events should occur. This is in non-volatile memory. There are other parts of the ECU which will be wiped out, such as error codes and the fine adjustments the vehicle does to itself to get the tune "just right", which is in volatile memory.
answered Sep 30, 2020 at 9:32
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That's all correct, but I have had an ECU totally erase its EEPROM on me on one occasion while swapping the battery (2010 Chevy Impala). No sparks or mixed up wires.– EᑎOTCommented Oct 2, 2020 at 20:50
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@Enot - While I can only assume what you are saying is correct, I'd bet there was some contributing factor which caused your ECU to take a dump. It doesn't happen like that very often and it's definitely not the norm, nor how it was designed to work. Every battery swap would cause a need for a remap. Sounds like your car really took a dump on you! :o(– Pᴀᴜʟsᴛᴇʀ2 ♦Commented Oct 3, 2020 at 0:43
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@Paulster2, yeah, Chevys tend to do that, don't they. :) Actually, I believe that in the manual for that car it says to maintain 12V to the car terminals while replacing the battery.– EᑎOTCommented Oct 3, 2020 at 22:46
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@Enot - That's usually so you don't lose the presets on your radio.– Pᴀᴜʟsᴛᴇʀ2 ♦Commented Oct 3, 2020 at 22:49