In the process of using decoder, errors can be found and diagnosed OBD connector link.
You can the OBD interface voltage and ground, which showed low voltage. Display diagnostic stitching error.
Jump for OBD interface signals. Signal lines such as decoder of 7 to 15 vehicles online.
Rapid detection of OBD2 diagnostic connector whether every stitch of the normal communication.
Replace the battery, save the car data function. When replacing the battery, plug the OBD2 connector into the car, at the same time connect additional power to the control box, so that ensure vehicle data is not lost.