One of the basic purposes of passenger vehicle engine tests on a chassis dynamometer is to verify the results of the tests carried out on engine test beds in terms of the ECU parameters. The paper presents the analysis of the engine load distribution in driving cycles both European and American. The issue of the influence of selected calibrations of a 1.3 Multijet engine on its operating parameters and the exhaust emissions has been presented. The realization of the project consisted in performing a series of tests on a chassis dynamometer for selected ECU calibrations determined during the engine test bed phase.