A multifunction tester for fault diagnosis is described, in which operational information from each element of a vehicle (19) is entered, which is characterised in that a multiple test-set (11) accepts input information from various vehicles (19) via a central connection (17) on the vehicle side and indicates the information content; a computer (21, 22) controls the vehicle information to be transferred via an output (20) of the test-set (11). <IMAGE>
