MEXICOWANDERER wrote:
Computers have batteries. Now how great of capacity would it take to transfer RAM files to PROM status when a disconnect is sensed? Wait! That's too easy. Jeeze a super cap could power this action. Common sense ECU design will be eventually be "discovered" in the Far East8
Actually, Fords ECU does that one better..
They do have "volatile" and "NON volatile" memory..
Cutting the battery loose for even overnight DOES NOT ALWAYS CLEAR ALL "CODES"..
If a code is severe enough it CAN be stored in non volatile memory and will pop up as soon as you reconnect the battery.
As far as keeping all engine parameters "saved", that is AN EASY FIX.
Take a SECOND 12V battery (can be anything from a small 12V gel cell or even another car battery) and CONNECT it to the vehicles battery terminals BEFORE disconnecting the old battery.
There used to be a little device which plugged into a cig lighter jack of your vehicle which had a 9V transistor radio battery and a diode that was touted to keep your engine computer settings.. Not sure if a 9V battery could do that but anything close to 12V should do the trick (eight AA dry cell batteries with a diode could possibly work, note, diode is there to protect the non rechargeable dry cells from turning into little fire crackers!).
I HAVE done the 12V battery trick multiple times on my own vehicles, works every time!
