Pressure Control solenoid location/testing

[OR'sLonewolf]

Hey Suba gurus........This is my first Soobie and automatic project I've had so yeah, noobie here. My persistent search comes up dry of this search engine and Google for this question. The ride? A 92 4wd LS wagon. Miles? Never understood why this even matters with any problem nor why people always want to know.
Just trying to keep myself from pulling the transmission and replacing with another possible POS tranny from a yard................30 day warranty or not.

Here is the Sitrep. Previous owner I think was being honest when she said one morning it just wouldn't move in gear and it had hesitation moving. Won't move in any gear. Oil level ok. I'm not getting any pressure from my trans it seems. During the tranny flush, nothing was flowing out either front radiator trans cooler lines. No noise indicating trans oil pump problems and no whining of the torque converter. It just sits quietly. Just minor metal on the magnet most likely from the clutch pack disks that will probably need replaced along with the Duty C as I have a code 24. This code probably happened because of lack of oil pressure and heat build up. Yeah, oil was dirty. I then decided to search out and test the Pressure control solenoid as it might be stuck shut keeping the oil from flowing. Seems to make sense to me based on my limited knowledge of autos.

First off, does it seem legit that the Line Pressure solenoid might be bad keeping it from flowing fluid? Does the Solenoid B, if not working, prevent fluid from creating pressure as well? I think the Duty B is a lock up solenoid for the TC.  Duty B doesn't seem to be working as a test with a 9volt battery caused no clicking sound and ohms drop down to zero when tested. I think it should be between 9-17 ohm.

So, with Duty C throwing a code, Duty B failing resistance test and maybe the Duty A also being bad........seems like something bad is going on. Sure would hate to get rid of a transmission if it's just a solenoid or two and a bad clutch pack that I can learn to replace.

 

What do you all think?  IF, the pump is bad.................wouldn't there be some sort of noise?? 

Edited January 29, 2018 by OR'sLonewolf

[Fairtax4me]

Pressure control solenoid doesn't have any bearing on fluid flow. It bleeds off some of the pressure if the pressure gets above a certain threshold which is determined by fluid temp/gear position/and several other factors on some electronic controlled trans.

There are PSCs that work based on mechanical pressure differential. Also keep in mind this is not a sensor, and doesn't reflect or indicate a pressure problem.

 

More than likely if you have no pressure that's due to a suction leak (the pump can't draw any fluid), a clog or leak in the pump discharge port, or a wasted pump or stuck pressure control valve in the pump.

 

If the fluid was very dark, a clogged filter is possible. If the car was driven for long with excessively dirty/burned fluid or clogged filter the pump could just be wasted.

[OR'sLonewolf]

Pressure control solenoid doesn't have any bearing on fluid flow. It bleeds off some of the pressure if the pressure gets above a certain threshold which is determined by fluid temp/gear position/and several other factors on some electronic controlled trans.

There are PSCs that work based on mechanical pressure differential. Also keep in mind this is not a sensor, and doesn't reflect or indicate a pressure problem.

 

More than likely if you have no pressure that's due to a suction leak (the pump can't draw any fluid), a clog or leak in the pump discharge port, or a wasted pump or stuck pressure control valve in the pump.

 

If the fluid was very dark, a clogged filter is possible. If the car was driven for long with excessively dirty/burned fluid or clogged filter the pump could just be wasted.

thanks for the reply.  somehow i was thinking maybe if they were blocked by the solenoids, fluid wouldn't pass.  as it looks, i'll just take a gamble of the used trans from the yard.  seems over my head to dig in and replace the pump.  solenoids and clutch pack wouldn't be a problem though.  last thing i want is me sitting on a grenade.

[Fairtax4me]

If you get one from a yard make sure the pan isn't crushed in. The solenoids on the valve body can be damaged easily if the pan gets dented.

[OR'sLonewolf]

If you get one from a yard make sure the pan isn't crushed in. The solenoids on the valve body can be damaged easily if the pan gets dented.

Thanks for the input, I'll keep my eye out.