Modular automotive diagnostic, test and information system

A vehicle test diagnostic system to provide information to maintain and repair equipment or provide services, comprising:

• an integrated control means for providing access to a technical database comprised of stored information records, with migration capacity between related records, and further to provide selective access to particular portions of information within the database, the integrated control means including a user interface responsive to operation by a user to provide commands, and a processing means responsive to commands entered through the user interface to access information;
• at least one instrumentation module electrically coupled to the integrated control means and a system of the vehicle under test, the instrumentation module being responsive to commands entered through the user interface;
• a vehicle communication link module electrically coupled to the integrated control means and an on-board computer of the system of the vehicle under test, wherein the vehicle communication link module is further coupled in parallel to the at least one instrumentation module.