Embedded automobile OBD (On-Board Diagnostics) fault diagnosing device

The utility model relates to an embedded automobile OBD (On-Board Diagnostics) fault diagnosing device comprising an MCU (Microprogrammed Control Unit) control module, a diagnosing interface circuit, a keyboard, a liquid-crystal display screen and a memory, wherein the diagnosing interface circuit, the keyboard and the liquid-crystal display screen are respectively and electrically connected with the MCU control module, and one end of the diagnosing interface circuit is further electrically connected with an OBD 16 type diagnosing joint through a signal channel switching circuit. On the basis of the original equipment supporting OBD communication, the cost of the embedded automobile OBD fault diagnosing device provided in the utility model is basically not increased, and the embedded automobile OBD fault diagnosing device can realize data exchange with different electric control systems of automobiles with a unified OBD diagnosing seat through simple circuit jumper configuration; the embedded automobile OBD fault diagnosing device does not need to be additionally provided with an electronic switch, a relay and the like so that the circuit design is simplified, and the volume of the circuit is not increased when the hardware cost is saved; and meanwhile, for the OBD diagnosing products of individual owners, under the condition of not increasing the cost of electronic devices, the embedded automobile OBD fault diagnosing device can realize diagnosis on more electric control systems of the automobiles, and greatly enhances the functions of products and expands the application range of the products.