DME 7.8 DME 7.8 0 · Perform system test for small lift

DME 7.8 DME 7.8 0 Perform system test for small lift Warning! Test is carried out while driving. Have a second person oper- ate the Porsche System Tester 2. 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 "below limit" is recorded. Several cylinders may be stored as faulty, although only one valve on one cylinder is faulty. In order to ensure that the fault is repaired, the flat-base tappets of the inlet valves of the entire cylinder bank should be replaced if a fault occurs. A faulty flat-base tappet can be detected because the oxygen sen- sor FR for this cylinder bank enriches the mixture (FR > 1) during acceleration with wide-open throttle see drawing below. Differ- ence from the other oxygen sensor > approx. 15 %. In the case of a fault, the flat-base tappets of the inlet valves for the entire cylinder bank must be replaced. A B 2470 P0300 0-43 page 9 Printed in Germany – 4, 2002 p0300