For this, special programs and cables are needed to put the ECU into flash mode so that a tuner can access the core data on the ECU, then download it. Usually, once the ECU has been opened, a tuner can do the rest of the work through the OBD2 port.
Manufacturers obviously do not want anyone tampering with their work, so these are all efforts to secure the ECU. Not all vehicles can be flashed this simply in certain scenarios, the physical ECU needs to be removed from the vehicle, taken apart and on a special bench, connected directly to specific pins on the ECU board. The process of flash tuning involves connecting a computer to the ECU in the car, usually via OBD2 port, and then downloading and re-writing the software that is on the ECU. This week, we move squarely on to flash tuning.
Last week, we wrote about piggybacks or tuning boxes, and why I do not believe in them.
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