A2L - ASAP2 ECU Description File is a standard format of file that has been specified by ASAM MCD-2MC ASAP2 workgroups. It is mostly used to describe certain interfaces, parameters and measurements that were made by an ECU electronic control unit. It also refers to any electronics component that is typically used to control some parts of a motor vehicle. The file type can sometimes help in the calibration and testing of an ECU in need of diagnostics. The A2L - ASAP2 ECU Description File format was recently adopted by the xCU development, testing & calibration community for wide use. It is also used by AVL CRETA Calibration Data Management as a viable solution for the diagnostics of power train systems in many vehicles.