a method for determining fuel injection pressure or detecting a discrepancy in the fuel injection process of an internal combustion engine is provided . the engine includes a camshaft that actuates at least one fuel injector of the engine &# 39 ; s fuel injection equipment . the method includes the step of determining a value t that is representative of the torque generated on the camshaft , such as the instantaneous torque or rotational speed of the camshaft , the torque being a resultant of accelerating and decelerating forces exerted on the camshaft by the at least one fuel injector during a phase of operation of the internal combustion engine . the method also includes the step of monitoring the value t for any increment , decrement or irregularity .