Hi There

My testing unit report no connection on my Nissan 2003 Hardbody or NP300. It reads the voltage but can't do any reading of the ECU? I have upgraded the OBD2 V519 firmwre but no results on diagnose the ECU? Any suggestions will help or must I send the unit back for replacemntt or upgrade to a better system? Please advise? This unit is brand new and never been usd. Only for the first time on the Nissan. Still in box.Please let me know and mail me on: willie@jojagin.net