An information storage system, comprising: a management controller , a vehicle-intelligent unit , and at least one subcontroller , wherein each subcontroller is connected to at least one executor , and the management controller is connected to each subcontroller ; the at least one subcontroller is configured to: when detecting that a fault occurs in an executor connected to the subcontroller , determine a fault number of the fault and send the fault number to the management controller ; the management controller is configured to: when receiving the fault number sent by the subcontroller , search for a parameter corresponding to the fault number and feed back the found parameter to the subcontroller sending the fault number, wherein the parameter is a parameter used to diagnose a fault cause; the at least one subcontroller is configured to: when receiving the parameter that is fed back by the management controller and that corresponds to the fault number, obtain a parameter value corresponding to the parameter, and send the parameter and the parameter value corresponding to the parameter to the management controller ; the management controller is configured to: when receiving the parameter and the parameter value corresponding to the parameter that are sent by the subcontroller , send the fault number, the parameter, and the parameter value corresponding to the parameter to the vehicle-intelligent unit ; and the vehicle-intelligent unit is configured to: when receiving the fault number, the parameter, and the parameter value corresponding to the parameter that are sent by the management controller , store the fault number, the parameter, and the parameter value corresponding to the parameter, wherein the at least one subcontroller is further configured to: when detecting that a fault occurs in the executor connected to the subcontroller , latch an operating parameter and a parameter value corresponding to the operating parameter; the at least one subcontroller is configured to obtain, from the latched operating parameter and the latched parameter value corresponding to the operating parameter, a parameter value corresponding to a target parameter, wherein the target parameter refers to the received parameter that is fed back by the management controller and that corresponds to the fault number; the management controller is further configured to: when receiving the parameter and the parameter value corresponding to the parameter that are sent by the subcontroller , send a latch deletion command to the subcontroller ; and the at least one subcontroller is further configured to: when receiving the latch deletion command sent by the management controller , delete, according to the latch deletion command, the operating parameter and the parameter value corresponding to the operating parameter. when detecting that a fault occurs in the executor connected to the subcontroller , latch an operating parameter and a parameter value corresponding to the operating parameter; the at least one subcontroller is configured to obtain, from the latched operating parameter and the latched parameter value corresponding to the operating parameter, a parameter value corresponding to a target parameter, wherein the target parameter refers to the received parameter that is fed back by the management controller and that corresponds to the fault number; the management controller is further configured to: when receiving the parameter and the parameter value corresponding to the parameter that are sent by the subcontroller , send a latch deletion command to the subcontroller ; and the at least one subcontroller is further configured to: when receiving the latch deletion command sent by the management controller , delete, according to the latch deletion command, the operating parameter and the parameter value corresponding to the operating parameter. <EOS>