DME 7.8 DME 7.8 0 · 0-145P1255

DME 7.8 DME 7.8 0 0-145P1255 230 Boost Pressure Characteristic, Upper Value Exceeded - Above Limit Diagnosis conditions • Boost pressure control active Possible fault cause ♦Leakage at pressure hoses from frequency valve to the bypass flaps ♦Frequency valve faulty ♦Vacuum modulators for bypass flaps leaking ♦Bypass flaps incorrectly adjusted Affected terminals Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check frequency valve Replace frequency valve 2 Check pressure hoses for Replace pressure leaks hoses or eliminate leaks 3 Check vacuum modula- Replace vacuum tors for bypass flaps for modulators leaks 4 Check adjustment of Adjust bypass flaps bypass flaps 2102 P1255 0-145 page 1 Printed in Germany – 1, 2000 p1255