DME 7.8 DME 7.8 0 · 0-144P1249

DME 7.8 DME 7.8 0 0-144P1249 231 Boost Pressure Control Deviation - Above/Below Limit Diagnosis conditions • Boost pressure control active (operating condition close to full load) • No faults in mixture adapation, pressure sensor, ambient pres- sure sensor, frequency valve Possible fault cause ♦Air cleaner clogged ♦Hose line from air cleaner to turbocharger kinked ♦Leakage on fresh-gas side ♦Leakage at exhaust-gas side ♦Hoses on frequency valve leaking ♦Bypass flaps incorrectly adjusted ♦Turbocharger faulty Affected terminals - Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check frequency valve Replace frequency valve 2 Check for air leaks in Repair intake air intake air system system 3 Check pressure hoses on Replace pressure frequency valve for leaks hoses or eliminate leaks 4 Check exhaust system for Repair exhaust sys- leaks tem 5 Check adjustment of Adjust bypass flaps bypass flaps 6 Check whether turbo- Replace the turbo- charger compressor shaft charger can rotate freely 2102 P1249 0-144 page 1 Printed in Germany – 1, 2000 p1249