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In the course of fault analysis, the most difficult thing to deal with is the failure symptom does not appear. In this case, it is necessary to understand the situation in detail to the customer and analyze it, and then simulate the same or similar circumstances and circumstances when the vehicle fails. No matter how rich the experience of the maintenance personnel, and how the technology is exquisite, if the failure is analyzed without verification, some important factors will be ignored in the repair, causing false guesses, causing the repair work to bend or not to make progress. Several effective fault symptom simulation methods are introduced here to test the external effects of parking vehicles.