We built the OBDII plugin using an ElmScan 3 (ISO-Elm323 chip) on a 2002 VW Jetta and 2001 Jeep Cherokee. The plugin's Init method tries 3 times to connect to the specified COM port. Sometimes it doesn't connect the first time. When that happens simply click the "Red disconnected" button and it will attempt to reconnect. If are still having problems please post your error.log in the /centrafuse directory.