I have DTC p0315, so I assume I will have to do a crank relearn? I have read up on the procedure but have a question about revving the engine to 4K rpm and the fuel cutting out. Is this a feature or result of the "Relearn" or does this "Fuel cutout" need to be set through the ecm? Also, how will I know if the procedure helped? The car runs fine as it is. Is the relearn necessary?