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.

常見故障一：電磁閥線圈短路或斷路

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

檢測方法：先用萬用表測量其通斷，阻值趨近于零或無窮大，那說明線圈短路或斷路。如果測量其阻值正常(大概是幾十歐)，還不能說明線圈一定是好的(我有一次測得一個電磁閥線圈阻值大概50歐姆，但電磁閥無法動作，更換該線圈后一切正常)，請進行如下測試：找一個小螺絲刀放在穿于電磁閥線圈中的金屬桿的附近，然后給電磁閥通電，如果感覺到有磁性，那么電磁閥線圈是好的，否則是壞的。該故障解決方法：更換電磁閥線圈。

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.

常見故障二：電磁閥插頭/插座有問題如果電磁閥是有插頭/插座的那種，有可能出現插座的金屬簧片問題、插頭上接線的問題(比如將電源線接到接地線上去了)等原因無法將電源送到線圈中。養成一個習慣：插頭插在插座上之后把固定螺絲擰上，線圈上在閥芯桿之后把固定螺母擰上。如果電磁閥線圈的插頭配備有發光二極管電源指示燈，那么采用DC電源驅動電磁閥時即行就要接對，否則指示燈不會亮。另外，不要將不同電壓等級的帶發光二級管電源指示的電源插頭調換使用，這樣會導致發光二極管被燒毀/電源(換用低電壓等級的插頭)出現短路或發光二極管發光很微弱(換用高電壓等級的插頭)。該故障解決方法：修正接線錯誤、修復或更換插頭、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.

常見故障三：電磁閥閥芯問題在電磁閥所通介質壓力正常的情況下，按下電磁閥紅色的手動按鈕，電磁閥都沒有任何反應(壓力介質沒有出現通斷的變化)，說明閥芯一定是壞的。該故障解決方法：檢查介質是否存在問題，如壓縮空氣內是否有很多積水(有時候油水分離器起的作用不是很大，特別是當管路設計不良時通到電磁閥的壓縮空氣會有很多積水)、所通液體介質是否有很多雜質。然后清除電磁閥及管路中的積水或雜質。如果再不行，請維修(如果你有時間有耐心而且有必要的話或可更換閥芯，或者干脆把整個電磁閥全部換掉。

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.