Methods and systems are provided for using a crankcase vent tube pressure or flow sensor for diagnosing a location and nature of crankcase system integrity breach. In particular, methods and systems are described that enable a determination of a pre-distortion correction signal to be determined, which when added to the nominal signal, a reduction in the distortion of the power amplifier results. A mating profile extends from the inner diameter to the outer diameter along the bottom side adjacent the planet gear. A gear radius of the drive gear may be greater than that of the follower gear meshing with it. The hemoglobin apparatus emits light at 522 nm to the reflective surface of the membrane.