Function testing device for an actuator system such as a automatic friction clutch used with a motor vehicle gearbox

Device to test the function of an electrically controlled actuator system of an automated torque transmission device, in particular of a clutch or a transmission which is located in a drive torque path of a motor vehicle, and comprising an electronic test circuit and a display device to indicate a malfunction,

• characterized by the fact
• that the test circuit comprises first sensor means for a measurement of at least one operating parameter which changes on account of an actuation operation of the actuator system, memory means for a storage of at least one limit value which corresponds to the operating parameter to be measured, and test means which identify the malfunctions as a function of a comparison of the measured operating parameter and the corresponding limit value, that the test circuit a function verification actuates the actuator system, starting from a first actuator position which corresponds to a first defined operating position of the torque transmission device, toward a second actuator position which corresponds to a second defined operating position of the torque transmission device, into an actuator test position which is located between the first and the second actuator position, in which the actuator system sets the torque transmission device to an operating position which corresponds essentially to the first operating position,
• and that the test circuit determines the malfunction as a function of the value of the operating parameter measured in the actuator test position.