VVDI Prog read Toyota ECU,you can check the chip type,and use vvdi prog read eeprom data. This blog is about chip FAIRCHILD NM93C56.
1.VVDI Prog software and choose detailed type,connect VVDI Prog with computer and Chip.
2.Read until operation successfully.If fail,please adjust depend on the error message.
4.Save the data.