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Bogusław Cieślikowski Mariusz Cygnar2 1 i 2 State University of Applied Sciences in Nowy Sacz, Technical Institute, 33-300 Nowy Sacz, Zamenhofa Street 1a MULTIPLE SYMPTOMPICAL ANALYSIS OF FAILS IN THE EGR SYSTEM OF HDI ENGINE The article presents the process of fault location in the HDR-rhr engine EGR system based on the characteristics obtained in the conditions of traction measurements using the ESI Tronic 2.0 program. The measurements were obtained using the licensed BOSCH KTS540 diagnostic tester. In the process of diagnostic inference the PWM signal coefficient has been analyzed in relation to the level of boost pressure, mass variability and air temperature in the intake system (based on MAF data) and EGR valve positioning for variable angular positions of the accelerator pedal. Analysis of the characteristics allowed for proper identification of faults previously stored in the system with OBDII error codes. The condition of the conducted analyses is a precise recognition of the functional features of the system and the knowledge of diagnostic procedures, which determines the correct orientation of the damage localization process. After the faults were removed, a test run was carried out, recording the variability characteristics of the degree of exhaust gas recirculation, boost pressure, driving speed and engine speed. The formal record of heat and mass exchange on the section of the engines intake system introduces a series of simplifications which determines the tolerance range of the instantaneous value of the exhaust gas recirculation rate. Attention was paid to the issue of sediment formation in the EGR valve channels as a result of using diesel oil with the participation of biocomponents. Sludge analysis was carried out in a certified laboratory using X-ray fluorescence methods with energy dispersion and infrared spectroscopy methods. Conclusions have been drawn for the presence of non-oxidized components of organic origin precipitated in the channels of the EGR system. Keywords: EGR exhaust gas recirculation valve, X-ray fluorescence, IR infrared spectroscopy, biocomponents