Fault detection and elimination method and system for vehicle control unit

The invention belongs to the technical field of vehicle fault detection, and discloses a fault detection and elimination method for a vehicle control unit. The method comprises the following steps: a vehicle control unit judges the current state of a brake pedal according to a first brake signal and forms a first judgment result; a brake control unit judges the current state of the brake pedal according to the second brake signal and forms a second judgment result; a standby control unit judges the current state of the brake pedal according to the third brake signal and forms a third judgment result; the first judgment result is compared with a third judgment result, and the second judgment result is compared with the third judgment result; and when the first judgment result is consistent with the third judgment result and the second judgment result is inconsistent with the third judgment result, a brake control unit fault indication is output. Through multiple times of data comparison, the judgment accuracy