The system comprises all required components;it is compact, can be used at once, and permits free wiring. The focus of thepedagogically valuable course documents is on car diagnosis. On the output sideof an electronic control or regulation system, the assessment results of themicroprocessor can be measured as actuator control voltages. Instate-of-the-art vehicle systems, onboard-diagnosis is a standard. Workshoppractice, however, shows that output interferences recognised by the controlunit are only formulated in very vague detail in the error storage. The reasonfor this is the fact that a control unit cannot actually recognise whether thedriving stage in the control unit, the connection lines to the actuator or theactuator as such are defective. The present lab system with its diversepractice-related actuators of intact and defective systems provides realmeasured values. Type, structure and alignment of the components facilitatetransfer competence from pure theory to the locally installed vehiclecomponents.