Diagnostic system for hydraulically actuated cam phasers

Diagnostic system for an engine (102), comprising: a phaser control module (202, 206) having a first cam phaser position of a cam phaser (150, 152) of the motor (102) for a first duration and a second cam phaser position of the cam phaser (150, 152) instructs for a second duration; and a phaser diagnostic module (204, 208) having a phaser control error for the cam phaser (150, 152) based on a first measured during the first permanent pressure of a fluid, that the cam phaser (150, 152) by an oil control valve (OCV) (160, 162) is supplied, and a second measured during the second period of the pressure fluid, diagnosed the cam phaser (150, 152) through the OCV (160, 162) is supplied.