Shift Solenoid Testing

[greasemanicure]

While testing on the trouble I have been describing in another thread in this forum, I pulled the shift solenoids to test them. (Code said that B shift circuit was open or stuck). All the solenoids had resistances around 27+ ohms. I hit them with a 9 volt battery to check for operation and all of them gave a sound click (9 volt terminals just span the connectors) Believing that a click is only one indication, I thought I'd test for flow in the off and on state. I found a piece of tubing that was a close match to the nozzle on the shift solenoids and applied light air pressure with a fish pump. They all seem to flow freely when unpowered. Hit them with power and they restrict the flow but do not completely seal. They all behaved the same in this regard.

Is this what I should have expected???

 

[imp]

While testing on the trouble I have been describing in another thread in this forum, I pulled the shift solenoids to test them. (Code said that B shift circuit was open or stuck). All the solenoids had resistances around 27+ ohms. I hit them with a 9 volt battery to check for operation and all of them gave a sound click (9 volt terminals just span the connectors) Believing that a click is only one indication, I thought I'd test for flow in the off and on state. I found a piece of tubing that was a close match to the nozzle on the shift solenoids and applied light air pressure with a fish pump. They all seem to flow freely when unpowered. Hit them with power and they restrict the flow but do not completely seal. They all behaved the same in this regard.

Is this what I should have expected???

Your work sounds OK from a practical standpoint, but be aware these solenoids are not ALL simply "on or off", as we remember solenoids long ago. Some have a variable stroke, controlled by the PCM, which watches shaft speeds relative to one another, to achieve similar shift "feel" regardless of operating conditions (load, speed, throttle opening, etc.).

It would help to know which transmission you are delving into. imp

 

[greasemanicure]

More info

The tranny valve body is of the 4r/5r family. When they all "leaked" a little, I supposed they could be normal.

Thanks, imp!