Abstract: An accelerator sensor detects an operation amount of an accelerator pedal. A microcomputer determines if a relation between the detected operation amount and an operation of the accelerator mechanism deviates from a predetermined normal relation, responsive to an ON signal from an idle switch or an ON signal from a power switch. When the relation deviates from the predetermined normal relation, the detected operation amount is corrected by the deviation from the predetermined normal relation in order to cause the relation between the operation amount and the operation of the accelerator mechanism to match the predetermined normal relation.