Basic methods, technological receptions and technical equipments of diagnosticating of the electronic systems, are described in train aid, blocks and separate submachines that presently are widely used in the motor-car side devices of automatic control and management. The questions of order of realization of diagnostics and search of disrepairs are expounded on motor-car combustion engines, questions encoding of disrepairs and read-out of kodas of errors. Modern requirements are described to cleaning of working exhaust-gass according to the standards of ОВD - II (THE USA) and EOBD - II (EU), and diagnostics of engines on the testimonies of gas analyzer, universal мотор-тестера, motor-car diagnostic scintiscanner. Information over is brought on basic measuring devices that is used for realization of motor-car diagnostics. Considerable part of train aid is sanctified to verification of knowledge of specialists on repair and diagnostics of engines of modern passenger cars by realization of test examination. Examination questions over are brought and the unfolded answers are given for them.Train aid passed approbation in the Samara technical university at the study of course the "Technical equipments of test and diagnosticating of the systems of electronics and automation of cars and tractors". It can be also usefully to the specialists on repair and diagnosticating of the electronic systems of car in the conditions of car-care center, for students and graduate students of Institutions of higher learning.