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In the course of using automobile, it is inevitable that there will be trouble. For experienced drivers, it is usually "one step" to find the problem. Most people are often helpless when they face trouble. Now learn to find fault for yourself. Vehicle faults can be roughly divided into three parts: one is circuit fault; two is oil circuit fault; three is fault. Among them, the circuit fault is divided into high voltage circuit and low voltage circuit fault. In actual use, about 60% of the vehicle's faults are circuit faults. 30%, on the oil circuit, most of these faults can be eliminated. Only about 10% are running system failures. These faults are mechanical faults. Most of the vehicles can still travel when they occur. They should be repaired at the special repair stations nearby. When you are in trouble, do not worry. Two, do not rush to start, first look at the situation of the fault indicator light. In the rest of the heart, analyze the phenomenon of the fault, and ask more why, there are two ways to judge and distinguish oil faults: one is the sudden stalling or slowly extinguishing on the way, and the sudden extinguishing of the fire is mostly the circuit fault; and the phenomenon of "flameout" slowly, or the "leap up" phenomenon of the vehicles, is mostly oil road fault. The two is "trial fire". If there is no central high pressure fire and divided cylinder fire, it is a circuit fault. If there is a high pressure fire, the problem is in the oil circuit. Most of the mechanical faults are accompanied by abnormal sound. The sound changes with the speed of the vehicle. When the sound is stopped, the sound disappears and has no direct relationship with the fault of the oil circuit. Using the "piecewise negation", the "focus" is locked in a particular place, first to understand what category it belongs to, and to see if the external exception is the first. It is worth reminding that the current new cars are mostly "electric spray" cars, which are electronically controlled combustion, with fewer faults, and the opposite of the old carburetor car failure probability. It needs to be remembered that, if the electric power injection car fails, it often needs a special computer detector, and the driver should not do it yourself, so as not to destroy the circuit program.