DME 7.8 DME 7.8 0 · ♦If a fault is detected, it is only recorded in the

DME 7.8 DME 7.8 0 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. ♦If misfires are stored, see Troubleshooting misfires. 630 Valve lift control, cylinder 4 - below limit Diagnosis conditions • Speed between 2,000 and 3,320 rpm • Load between 45 and 70 % • Acceleration with wide-open throttle Possible fault cause ♦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 small lift Warning! During the system test for small lift, the valves remain at small lift, regardless of the type of driving. Faulty switching conditions can be detected by rough running, just like with misfire detection. If a valve is not switched to small lift, the fault type ’under limit’ is recorded. Several cylinders may be stored as faulty, although only 1 valve on one cylinder is faulty. In order to guarantee safety during repairs, the flat-base tappets of the inlet valves of the entire cylinder bank should be replaced if a fault occurs. 1555 P1354 0-160 page 3 Printed in Germany, 2000 p1354