If you're trying to read the full internal flash (ST10F275), remember that this ECU usually requires adding two 6k8 resistors and removing one resistor on the board to trigger the bootstrap. Always verify your board version before soldering!
Tools like DFB Technology allow for a full read and write of the Micro and EEPROM (typically a 95320 eeprom ) via these pinout connections. Essential Precautions me7.4.5 pinout