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Originally Posted by blinkwatt
I thought the USB idea could be applied to older ECU's,where they actually sod or connect a chip the ECU. With the OBD II systems people I thought the ECUs are "flashed" via the OBD II ports?
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Older ECUs where you had to replace a chip used a ROM or PROM chip to store maps. The chip could be written to once and then it was permanent. The maps now are stored in rewriteable EEPROM flash memory which is the same technology used on memory sticks.