Diagnostic method and device of vehicle-mounted controller

The invention discloses a diagnosis method and device for a vehicle-mounted controller, and belongs to the technical field of diagnosis testing. The method is applied to a diagnostic tool and comprises the following steps: in response to connection of the diagnostic tool and a to-be-tested vehicle-mounted controller, determining a diagnostic test service package corresponding to the to-be-tested vehicle-mounted controller, the diagnostic test service package being stored in the diagnostic tool, different types of to-be-tested vehicle-mounted controllers correspond to different diagnosis test service packages; reading the diagnostic test service package, wherein the diagnostic test service package comprises a plurality of service detection items; according to a preset sequence, service detection items are sent to the to-be-detected vehicle-mounted controller in sequence, and feedback information from the to-be-detected vehicle-mounted controller is received; and obtaining a diagnosis result based on the feedba