The failure of the solenoid valve will directly affect the action of the switching valve and the regulating valve. The common faults are the non-action of the solenoid valve, which should be checked from the following four aspects.

(1) Air leakage: the air leakage can cause the air pressure to be insufficient, so that the opening and closing of the forced valve is difficult. The reason is that the gasket is damaged or the slide valve is worn to cause several cavities to blow. When the solenoid valve of the switching system is in fault, the appropriate timing should be selected, and the solenoid valve shall be processed at power-up. If the process is not finished in one switching gap, the switching system may be suspended and handled.

(2) Solenoid valve stuck: the clearance between the slide valve sleeve and the valve core is very small (less than 0.008mm), which is usually a single assembly. When there are mechanical impurities or too little lubricating oil, it is easy to get stuck. The treatment method can be pierced through the small hole of the head with steel wire to make it bounce back. The fundamental solution is to remove the solenoid valve, remove the valve core and the valve core sleeve, and clean it with CCI4, so that the valve core can move flexibly in the valve sleeve. When disassembling, attention should be paid to the assembly sequence and external wiring position of each component in order to reassemble and connect correctly, and to check whether the fuel injection hole of the oil mist is clogged and whether the lubricating oil is sufficient.

(3) The solenoid valve junction is loose or the wire head falls off, the solenoid valve is not electric, and the wire head can be fastened.

(4) The solenoid valve coil is burnt out, and the wiring of the solenoid valve can be removed and measured with a multimeter. If the circuit is open, the solenoid valve coil will burn out. The reason is that the coil is wet, resulting in poor insulation and magnetic leakage, resulting in excessive current in the coil and burning down, so Rain Water should be prevented from entering the solenoid valve. In addition, the spring is too hard, the reaction force is too large, the number of coil turns is too small, and the suction is not enough to make the coil burn down.