Automatic transmission solenoid pneumatic valve how to check?

automatic transmission solenoid pneumatic valve like the faucet, the different opening of the hydraulic oil flow, through which result in different pressure. Solenoid pneumatic valve is controlled by transmission electronic control module TCU, gap and basically is a constant value, the pressure of gear is in the process of shifting to adjust the opening of pneumatic valve in order to improve shifting comfort. Different electromagnetic pneumatic valve controls the clutch or brake, play a role in different gear. Each gear is controlled by one or several common pneumatic valve effect.
automatic transmission solenoid pneumatic valve is roughly divided into two classes

switch type through certain current or voltage, make the battery internal coil electric pneumatic valve, and then drive internal needle pneumatic valve or ball valve displacement occurs, thus resulting resistance or oil. Used to control the shift.

pulse type current duty ratio control and frequency control. Used for adjusting oil pressure.
solenoid pneumatic valve cannot be idle in the absence of oil pressure, because it will be easy to cause electromagnetic motor dry damage in the pneumatic valve.
check of pneumatic valve can be roughly divided into three kinds of
, static checking static checking refers to the ignition switch OFF when measuring the resistance value of pneumatic valve, as shown, use multimeter pen are connected to the pin of pneumatic valve, observation instrument value is displayed on the screen, if it is greater than the rating, explain the electromagnetic solenoid coil aging; If lower than the rating that coil turn-to-turn short circuit; If infinite, explain the electromagnetic coil of pneumatic valve open, these cases illustrate solenoid pneumatic valve have failed and must be replaced.
dynamic check dynamic check refers to simulating the actual working process of electromagnetic pneumatic valve, replace the oil pressure, with certain pressure through a human motivation, on electromagnetic pneumatic valve check solenoid pneumatic valve pneumatic valve core movement is smooth, sealing is good. The pressure of the air gun will surely by conical rubber head on oil hole in the work of the electromagnetic pneumatic valve, pressure control switch repeatedly make electromagnetic pneumatic valve on-off, observe the drainage of the inlet air flow changes, if the air is always exists, explain bad solenoid pneumatic valve seal; If have no airflow, explain the electromagnetic pneumatic valve plug jammed; If air break a norm that electromagnetic pneumatic valve accidental binding; If air changes along with the action of electromagnetic air valve, solenoid pneumatic valve is normal.
check two inspection before, hot, and not absolutely, a lot of maintenance examples have shown that certain electromagnetic air valve in the first two check all normal circumstances, into the hot condition but disorder, difficult to live up to expectations, the produced some strange fault phenomenon makes maintenance work in trouble. As the name suggests, the hot check refers to simulate the normal work of the automatic transmission can achieve the set temperature, heat fan or other heating equipment such as oil, electricity, etc. , artificial heat to the solenoid pneumatic valve to its normal operating temperature, then carries on the resistance and dynamic pressure testing, then check the result if the normal, explain the electromagnetic pneumatic valve is no problem; If the aberrations, will have to change.