Generic OBDII Protocol Detector & Break Out Box OBD Diagnostic tool OBD line signal test car fault diagnosis Tool can monitor the OBD interface voltage and ground, showed low voltage. Display diagnostic stitching error. Jump for OBD interface signals. Signal lines such as decoder of 7 to 15 vehicles online. In the process of using decoder, error can be found and diagnosed OBD connector link. Rapid detection of OBD2 diagnostic connector whether every stitch of the normal communication. When replace the battery, plug OBD2 connector into the car, at the same time connect additional power to the control box, so that ensure vehicle data is not lost.