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Inspection and analysis: the maintenance personnel try the car to confirm that the abnormal sound comes from the front axle. Check the chassis without any damaged parts. The car is a four-wheel drive, and the front axle is abnormal when it turns, indicating that it is related to the front wheel drive system. In order to isolate the fault, the fuse of the control unit of the distributor is removed, so that the torque distribution before and after is 0:100, that is, the rear wheel is used to drive the vehicle. Disconnect the front wheel drive and test the car, and the trouble will disappear. After inserting the fuse, repeated trial run confirms that the abnormal sound comes from the inner part of the distributor. Troubleshooting: replace the distributor assembly, trial run, confirm troubleshooting.