The solenoid valve is just like a faucet. The hydraulic oil flow rate is different and the pressure is different when the opening is different. The solenoid valve is controlled by the transmission electronic control module TCU. Basically, the pressure in neutral and in gear is constant. Only in the process of shifting, the opening of solenoid valve is adjusted to improve the shift smoothness. Different solenoid valves control different clutches or brakes, and play a role in different gears. Each gear is controlled by one or more solenoid valves.

常见故障一：电磁阀线圈短路或断路

Common fault one: solenoid valve coil short circuit or open circuit

检测方法：先用万用表测量其通断，阻值趋近于零或无穷大，那说明线圈短路或断路。如果测量其阻值正常(大概是几十欧)，还不能说明线圈一定是好的(我有一次测得一个电磁阀线圈阻值大概50欧姆，但电磁阀无法动作，更换该线圈后一切正常)，请进行如下测试：找一个小螺丝刀放在穿于电磁阀线圈中的金属杆的附近，然后给电磁阀通电，如果感觉到有磁性，那么电磁阀线圈是好的，否则是坏的。该故障方法：更换电磁阀线圈。

Detection method: first use a multimeter to measure its on-off, the resistance value tends to zero or infinite, which indicates that the coil is short-circuit or open circuit. If the resistance value measured is normal (about tens of Ohm), it can not indicate that the coil must be good (I once measured the resistance of a solenoid valve coil about 50 ohm, but the solenoid valve could not act, after replacing the coil, everything was normal), please carry out the following test: find a small screwdriver and place it near the metal rod in the solenoid valve coil, and then power on the solenoid valve To magnetic, then the solenoid valve coil is good, otherwise it is bad. Solution: replace the solenoid valve.

常见故障二：电磁阀插头/插座有问题如果电磁阀是有插头/插座的那种，有可能出现插座的金属簧片问题、插头上接线的问题(比如将电源线接到接地线上去了)等原因无法将电源送到线圈中。养成一个习惯：插头插在插座上之后把固定螺丝拧上，线圈上在阀芯杆之后把固定螺母拧上。如果电磁阀线圈的插头配备有发光二极管电源指示灯，那么采用DC电源驱动电磁阀时即行就要接对，否则指示灯不会亮。另外，不要将不同电压等级的带发光二级管电源指示的电源插头调换使用，这样会导致发光二极管被烧毁/电源(换用低电压等级的插头)出现短路或发光二极管发光很微弱(换用高电压等级的插头)。该故障方法：修正接线错误、修复或更换插头、插座。

Common fault 2: there is a problem with the plug / socket of the solenoid valve. If the solenoid valve has a plug / socket, there may be problems with the metal spring of the socket, wiring problems on the plug (such as connecting the power line to the ground wire) and other reasons, which can not send the power to the coil. Form a habit: after the plug is inserted into the socket, screw on the fixing screw, and screw the fixing nut on the coil after the valve core rod. If the plug of solenoid valve coil is equipped with LED power indicator, then when DC power is used to drive solenoid valve, it should be connected properly, otherwise the indicator light will not be on. In addition, do not replace the power plug with LED power indicator of different voltage levels, which will lead to LED burnout / short circuit of power supply (replace with plug of low voltage level) or weak light emission of LED (replace with plug of high voltage level). The solution: correct the wiring error, repair or replace the plug and socket.

常见故障三：电磁阀阀芯问题在电磁阀所通介质压力正常的情况下，按下电磁阀红色的手动按钮，电磁阀都没有任何反应(压力介质没有出现通断的变化)，说明阀芯一定是坏的。该故障方法：检查介质是否存在问题，如压缩空气内是否有很多积水(有时候油水分离器起的作用不是很大，特别是当管路设计不良时通到电磁阀的压缩空气会有很多积水)、所通液体介质是否有很多杂质。然后电磁阀及管路中的积水或杂质。如果再不行，请维修(如果你有时间有耐心而且有必要的话或可更换阀芯，或者干脆把整个电磁阀全部换掉。

Common fault 3: solenoid valve core problem under the condition of normal medium pressure of the solenoid valve, press the red manual button of the solenoid valve, the solenoid valve has no reaction (the pressure medium has no change of on-off), indicating that the valve core must be broken. Solution: check whether there is a problem with the medium, such as whether there is a lot of water in the compressed air (sometimes the role of the oil-water separator is not great, especially when the pipeline design is poor, there will be a lot of water in the compressed air passing to the solenoid valve), and whether there are many impurities in the liquid medium. Then remove the water or impurities in the solenoid valve and pipeline. If it doesn't work again, please repair (if you have time, patience and necessary, you can replace the valve core or replace the whole solenoid valve.