OTC 3625-20 CANdi Module An industry change in protocol from OBD II to Controller Area Network is ongoing In order to perform diagnostics on a vehicle that uses the CAN interface, you will need the Tech 2 and a CAN diagnostic interface module The CANdi module connects between the Tech 2s diagnostic link cable and the OBD adapter Once the CANdi module is connected it can be used on all GM vehicle applications even those vehicles using other platforms such as OBD I and OBD II Important: For the CANdi module to work you must have a 32 MB PCMCIA card with at least software version 24.001 in your Tech 2 Flash