DME 7.8 DME 7.8 0 · 0-156.1P1350 - 911 Carrera

DME 7.8 DME 7.8 0 0-156.1P1350 - 911 Carrera Valve lift control checksum error - signal implausible Diagnosis conditions • Engine idle and acceleration with wide-open throttle Possible fault cause ♦In large lift, a valve stays at small lift, and in small lift, a valve stays at large lift ♦In large lift, several valves (different cylinders) stay at small lift, and in small lift, several valves stay at large lift Affected terminals - Diagnosis/troubleshooting Perform system test for small lift Note! The test is carried out at standstill with the engine running 1 - Select system test. 2 - Select "Request small lift". If "Valve lift diagnosis not ready" appears, a fault may have been stored. In this case, delete the fault memory. The engine must be at operating temperature. 1. Increase the engine speed to 2,000 rpm and hold for 30 seconds. 2. Then press the F8 key. 3. Increase the engine speed to 3,000 rpm and hold for 30 seconds. 4. Operate the engine for 30 seconds at engine idle speed. After 3,000 ignitions the Tester indicates whether a fault is present or not. 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. 1555 P1350 - 911 Carrera 0-156.1 page 1 Printed in Germany – 8, 2002 p1350a