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Failure and troubleshooting of solenoid valve: the failure of solenoid valve will directly affect the action of switching valve and regulating valve Common failures include failure of solenoid valve Troubleshooting shall be carried out from the following aspects: 1 The connector of solenoid valve is loose or the connector falls off, the solenoid valve shall not be electrified, and the connector can be tightened 2 If the solenoid valve coil is burnt out, the wiring of the solenoid valve can be removed and measured with a multimeter If there is an open circuit, the solenoid valve coil is burnt out The reason is that the coil is damped, resulting in bad insulation and magnetic leakage, causing excessive current in the coil and burning, so it is necessary to prevent rainwater from entering the solenoid valve In addition, if the spring is too hard, the reaction force is too large, the number of turns of the coil is too small, and the suction force is not enough, the coil can be burnt In case of emergency treatment, the manual button on the coil can be turned from "0" position to "1" position in normal operation to make the valve open 3 The solenoid valve is stuck The fit clearance between the slide sleeve and the valve core of the solenoid valve is very small (less than 0.008mm), which is generally a single assembly When there are mechanical impurities or too little lubricating oil, it is easy to get stuck The steel wire can be pierced through the small hole in the head to make it bounce back The fundamental solution is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean it with CCI4, so that the valve core can move flexibly in the valve sleeve During disassembly, pay attention to the assembly sequence and external wiring position of each component, so as to reassemble and wire correctly, and check whether the fuel injection hole of the oil mist atomizer is blocked and whether the lubricating oil is sufficient 4 Air leakage Air leakage will cause insufficient air pressure, which makes it difficult to open and close the forced valve The reason is that the sealing gasket is damaged or the slide valve is worn, resulting in several cavity blowby When dealing with the failure of the solenoid valve of the switching system, the appropriate time shall be selected, and the solenoid valve shall be handled when it is in power loss If it cannot be handled completely within a switching gap, the switching system can be suspended and handled calmly