Fault phenomena:
 When measuring the main pin, the first step is to center the steering wheel, and then when the second left-hand steering wheel is hit, it is found that the system can not reach the prescribed position, and the display will also prompt the CCD pipeline of several sensors to be blocked.

Analysis of faults:
1) In the process of measuring the steering wheel by the main pin, whether the four sensors are blocked by the light spot or not.
2) Check whether the program coefficient Steering Angle = 5 is too small. ,

Judging faults and solving methods:
1) In the cancellation measurement operation, when the steering wheel can not hit the position specified by the system, the first step is to check whether the four sensors are blocked.
2) Change the coefficient of Steering Angle to 5.