Apparatus and method for diagoning vehicle speed sensor of vehicle

There is a vehicle speed sensor fault diagnosis apparatus and method of the car is disclosed a so based on the average value of the wheel speed change rate to diagnose the disconnection of the vehicle speed sensor. The vehicle speed sensor trouble diagnosis device of this vehicle, according to the vehicle speed sensor failure diagnostic apparatus, calculating the average value of the vehicle speed information, and the wheel speed information supplied from the outside in a predetermined period of time is collected to collect the wheel speed change rate for, and operation of the wheel when the average value of the rotational speed variation rate to have a predetermined value smaller than the threshold value, the said vehicle speed information, characterized in that it comprises an engine control unit that determines that the noise is inserted, according to the present invention, the wheel speed is supplied from the outside using information by accurately determining whether or a noise component into the line or the vehicle speed information from vehicle speed sensor, it is possible to execute the failure diagnosis with respect to the vehicle speed sensor. Vehicles, vehicle speed sensor, wheel speed sensor