09-24-2012, 04:39 PM
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#68
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Use the Force
Drives: 2015 Corvette Z51, 2018 Porsche GTS
Join Date: Jan 2010
Location: Davie, Fl.
Posts: 3,862
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Quote:
Originally Posted by strych9
LOL @ "reboot". Well, kind of.
The ECM fuel tables have "volatile" memory, meaning that if power is taken away from that memory, the data within it is lost. Fuse 5 and 20 have power through them at all times, to keep the memory alive. When you pull those fuses, the memory erases. When you re-install and then start the engine, the ECM looks at the new values since there are none stored in memory, and stores the new information, which is retained until the next fuse pull, OR you run lower octane fuel and if needs to move to the lower octane data table.
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OK thanks, now I understand better. I did not realize that there was constant voltage going through fuses 5 & 20. I thought the fuses would only be active when the ignition was on. I appreciate the information.
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