Device and method for diagnosing failure of output shaft speed sensor of automatic transmission

摘要

In the failure diagnosis device of the output shaft rotation speed sensor sensor of the automatic transmission to determine the failure of the PG-B using the vehicle speed reed switch, the vehicle that detects the output signal that is variable according to the driving state of the vehicle and outputs a predetermined electric signal Driving state sensing means; Even if a failure occurs in the vehicle speed reed switch in response to a predetermined electric signal output from the driving state detecting means, a failure of the PG-B is detected by the PG-A which detects the amount of change in the throttle opening degree and the rotation speed of the kick-down rum and controls the hydraulic pressure. A TCU for determining a speed change at the third speed, outputting a predetermined fault code, and outputting a request signal for vehicle inspection; According to a predetermined duty control signal output from the TCU, the shift stage is held at three speeds, and driving means for turning on the vehicle inspection lamp is provided, thereby preventing the shift stage of a high speed vehicle from being shifted at one speed. Large traffic accidents can be prevented, driver safety can be increased, and the durability of the automatic transmission can be increased.