DIAGNOSTICS OF MODERN MOTOR VEHICLES

The need for diagnostics of motor vehicles arises for the reason of monitoring their entire life cycle, ie the ecological boundary that led to the development of new diagnostic systems. The task of diagnostics is to register the malfunctions of all devices responsible for emissions from motor vehicles. The recorded fault is stored by the electronic control unit (EUJ) in a way that can be read: as an "express item with the driver", as a mandatory item in the service, and then with the manufacturer to monitor reliability. This is how On-Board Diagnostic (OBD) systems were created, which are present in almost all modern vehicles. Diagnostics is the basic type of finding defects, ie the main part of technical maintenance of the car. Otherwise, technical diagnostics aims to assess the current technical condition of the motor vehicle, ie its systems, without disassembling them. In this way, it is possible, later, to plan and undertake certain maintenance activities or forecasts of the technical condition of the system. The paper focuses on the diagnosis of motor vehicles in laboratory conditions using modern devices. Bosch's FSA 750 diagnostic device is shown, which contains a KTS 670 diagnostic measuring device with ESI [tronic] diagnostic software and a motor tester with the Compact Soft software package for various oscilloscope measurements on vehicles. ESI [tronic] contains a software package that establishes communication with the electronic control units of various vehicle electronic systems via a diagnostic connector, as well as detailed instructions for troubleshooting engine management, stability, safety and comfort systems. Methods of technical diagnostics of motor vehicles are also given in the paper. The technical condition of the vehicle can be described by "diagnostic parameters", which primarily depend on the structure of the vehicle. The structure of a vehicle is expressed by the parts that make it up, as well as by the connections between those parts, and depends on: the number and type of parts that make up the structure of the vehicle; size and arrangement of parts; the number of connections and the types of connections between vehicle parts and the interactions between parts. In the diagnosis of motor vehicles, the most commonly used methods are universal, energy, vibroacoustic and thermal methods, and special methods: geometric, electrical, methods for determining the tightness of working volumes and methods for assessing the chemical composition or concentration of harmful substances. and finally a conclusion is given about the importance of motor vehicle diagnostics. In the end, it was concluded that today, there is almost no motor vehicle that does not have some kind of diagnostics and diagnostics of some of its systems