1. A fully-closed position learning method in a vehicle motion control apparatus configured to execute fully-closed position learning process routines for performing learning and updating of a detection value associated with a fully-closed position of an accelerator pedal, the detection value detected by an accelerator pedal sensor, the method characterized in that: two fully-closed position learning process routines are executed independently, one of them being an actual control fully-closed position learning process routine in which a learning value thereof is supplied for actual motion control of a vehicle, and the other one being a monitoring fully-closed position learning process routine for monitoring whether or not the learning value in the actual control fully-closed position learning process routine is appropriate by comparing the learning value in the actual control fully-closed position learning process routine with a learning value thereof; and it is determined that the actual control fully-closed position learning process routine is in an erroneous learning condition in which fuel is injected in an amount exceeding an actually required amount if the learning value in the actual control fully-closed position learning process routine is lower than the learning value in the monitoring fully-closed position learning process routine.