ITEM NAME:9 Pin J1939 to 16 Pin OBD2 Female Interface Diagnostic Cable Adapter Description: - OBD2 16 pin female to J1939 9 Pin Adapter Cable. - It has integrated the basic diagnostic functions of J1939 heavy duty truck standard communication protocols. - 9 pin female connector can be found in a range of diesel-.OBD2 16 pin female to J1939 9 Pin Adapter Cable. - It has integrated the basic diagnostic functions of J1939 heavy duty truck standard communication protocols. - J1939 CAN BUS diagnostic unit (for trucks);.