DME 7.8 DME 7.8 0 · 4 - Perform acceleration with wide-open throttle in

DME 7.8 DME 7.8 0 4 - Perform acceleration with wide-open throttle in 2nd gear, until "Valve lift diagnosis complete" (max. 4,000 rpm) appears. If misfires are stored, perform the system test again. Note! ♦If a fault is detected, it is only recorded in the fault memory after 6,000 ignitions (at idling speed approx. 3 minutes waiting time). ♦It is important to observe the oxygen sensor during acceleration with wide-open throttle or to record its behaviour with the data logger. 637 Valve lift control checksum error - signal implau- sible Diagnosis conditions • Speed between 2,000 and 3,320 rpm and between 5,280 and 6,520 rpm • Load between 45 and 70 % and between 125 and 190 % • Acceleration with wide-open throttle Possible fault cause ♦A valve does not switch to large lift ♦Several valves (various cylinders) do not switch to large lift and ♦A valve does not switch to small lift ♦Several valves (various cylinders) do not switch to small lift Affected terminals - Diagnosis/troubleshooting Perform system test for large lift Warning! 1555 P1350 0-156 page 5 Printed in Germany, 2000 p1350