Full protocol OBD2 jumper is used to connect E.CU for E.CU coding via OBD2 way. Full Protocol OBD2 Jumper, Used to Connect E.CU For E.CU Coding. Support standard obd2 full protocol connection [double K line, double CAN line], 3 large and 2 small power plugs, 4 large GND, 4 small GND.