by radsdau » Sun Nov 13, 2011 3:36 pm
Sorry- I should have mentioned that connecting to read the ROM and connecting to reflash the ROM use the same process, which is putting the ECU into boot mode, then uploading a reflashing kernel. The reflashing kernel also provides ROM read functions, as well as CRC checking for the data to be reflashed.
If you can read the ROM, you should be able to reflash the ROM, presuming there is sufficient battery voltage available.
Reading codes and data is done while the car is still in normal operation, i.e., not in boot mode.