Patent ID: 7871136

Claim:
A trouble diagnosis device of a vehicle body acceleration sensor which performs a trouble diagnosis of the vehicle body acceleration sensor based on the vehicle body acceleration sensor which is mounted on a vehicle, a vehicle speed detection means which detects a speed of the vehicle, and a vehicle body acceleration sensor output fluctuation width arithmetic means which calculates an output fluctuation width of the vehicle body acceleration sensor, wherein the trouble diagnosis device by determining that an output fixing trouble of the vehicle body acceleration sensor is not generated at a point of time that the output fluctuation width of the output value of the vehicle body acceleration sensor becomes a predetermined value or above during the traveling of the vehicle with the vehicle speed equal to or more than the predetermined speed, and by stopping the trouble diagnosis of the output fixing trouble of the vehicle body acceleration sensor until the vehicle speed is lowered to a value less than the predetermined speed avoids the unnecessary trouble diagnosis of the output fixing trouble of the vehicle body acceleration sensor, and the trouble diagnosis device is operated until the vehicle speed which is detected by the vehicle speed detection means becomes equal to or more than a predetermined speed and the output fluctuation width of the vehicle body acceleration sensor which is calculated by the vehicle body acceleration sensor output fluctuation width arithmetic means becomes a predetermined value or more.