An improved scan tool, e.g., for OBD II, for use with vehicle computer networks.
The improved scan tool determines the proper protocol to use to communicate with
a vehicle computer network. The proper protocol is determined by requesting information
from the vehicle computer network using a plurality of protocols and selecting
the protocol that returns the most pieces of information. In addition, the improved
scan tool determines a communications drop-out with one or more modules and automatically
recovers from the communications drop-out.
