Diagnostic system for a valve actuating mechanism

A diagnostic system for an engine includes a pressure monitoring module that determines a plurality of first average pressure values ​​and a plurality of second average pressure values ​​a fluid supply, which is provided to a camshaft phaser. A diagnostic module identifies one of a plurality of cylinders associated with a disturbed mechanism for the variable valve lift, based on the first and second average pressure values. Each of the first and second average pressure values ​​corresponds to each of the plurality of cylinders.