Cayman S (987) F6-3.4L (2008)
The monitor runs immediately after a shift to large valve lift for approximately 3 sec.
This strategy enables the diagnosis to also detect a slow shifting cylinder bank.
The diagnosis is disabled at:
-
power stage error of solenoid valves
-
oil temperature > threshold
-
during catalyst heating +
-
lambda control not active
Diagnosis via deviation of engine speed fluctuation
If both solenoid valves have a malfunction the diagnosis is performed according to the following scheme:
The monitor runs after coldstart with large valve lift during engine idle and vehicle speed at zero. A second phase of engine idle and vehicle speed at
zero is needed after coldstart. In both phases the position of the camshaft has to be static.
The diagnosis is disabled at:
-
power stage error of solenoid valves
-
oil temperature out of limits