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Electronic control units of engines have an ever-increasing complexity and more and more software functions need to get calibrated. Today it is possible to automate virtually every test procedure needed for these calibration tasks. But with currently available systems the effort required to set up automatic procedures often outweighs the advantages even if a commercial toolbox is readily available. The goal of this paper is to show a new concept for a calibration system that allows for creation and modification of test sequences with relatively little knowledge and reuse of test procedure components. Included is a language that features special commands and integrated knowledge for engine test bed applications. Flexible handling of exception situations, reusability of test procedure components and extensibility of the language will be discussed. The implementation of a typical test procedure will be shown.