A method for operating an engine having a variable cam timing control
system, for controlling a camshaft angle in such engine. The method
includes deactivating the variable cam timing system and setting the
camshaft angle to a predetermined angle for a predetermined duration
after failure in a sensor used to control the variable cam timing system
and then reactivating the variable cam timing system after such
predetermined time. The deactivating continues during the predetermined
duration in the presence of a subsequent failure of the sensor during the
predetermined duration. The reactivating comprises driving the cam angle
to a camshaft angle established by the variable cam timing system in a
predetermined manner. The reactivating occurs over a predetermined
reactivation time.