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Contemporary hybrid powertrains are complex systems in which the optimization of energy flow management is essential for the system’s most efficient operation. There are many variants of powertrain systems, differing in construction, operational strategy, and the method of power distribution between the internal combustion engine and the electric motor. Manufactourers implement their own, customized energy management strategies as needed, which complicates an unequivocal assessment of the efficiency of individual solutions. This article presents an analysis of the operation of the electric motor, generator, and internal combustion engine within the hybrid powertrain system of a Toyota Corolla. To compare data regarding energy utilization from these sources, a specially designed diagnostic scanner was employed in our laboratory, enabling the capture of data from the vehicle\'s Controller Area Network (CAN). The tests were conducted on a laboratory chassis dynamometer, taking into account the NEDC (New European Driving Cycle) and WLTP (Worldwide Harmonised Light Duty Vehicle Test Procedure) protocols. Additionally, experiments were performed under real urban traffic conditions. The analysis of the collected data provided detailed insights into the operation of the aforementioned components, which are integral to the powertrain during characteristic driving scenarios. For selected test fragments, an analysis of energy consumption and recovery by the electric motor and generator is presented. Keywords: hybrid powertrain system, CAN diagnostic scanner, WLTP test powertrain management, NEDC test,