Bluetooth issue P3100 , pairing window reappears every 5 seconds

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http://forum.xda-developers.com – I have a Samsung tab 2 P3100, this is my first android device! i bought it for the sole reason to connect to my car's OBD.(On-Board Diagnostics) via a Bluetooth obd adapter [ELM327 E-327 v1.5 Interface Bluetooth OBD2] using Torque app pro on Google play. The problem is , it connect and pairs with the tablet the adapter is displayed as paired in Bluetooth settings! but when torque pro is opened I choose connect via Bluetooth , a screen keeps appearing every 5 seconds please enter Bluetooth pin. the same happens if i use another application like palmers dashcommand to connect to (HowTos)