hey guys ive been working on this truck for a while now and i cant get to fixing it.
1990 ford ranger 2.3L 5 speed

the problem is that my egr solenoid isnt opening i got a code for it and my check engine light comes on 5 minutes after turning the truck on every time once i turn it off it goes away then comes back on.

i know that my egr valve is working, i already took it off and cleaned it throughly and seems fine. i found out when i removed the vauum line to the solenoid that there was no vacuum when i accelerted the truck. so that lead me to the egr solenoid. there is vacuum comming to the solenoid but solenoid isnt opening. ive tested 3 other solenoids and the same thing.

now im wondering how the solenoid works?
im thinking that it has constant power and the ecm controls the ground by pulse width modulation...

i checked voltage and im getting constant 13-15v when running
i check ground im also getting same voltage which means i have no ground.
i also did a voltage drop on the solenoid and im not getting anything
i went ahead and checked on the ecm terminal and same thing 14v comming in when running...
meaning its not operating hence no ground. so the only thing left to say is that there is an open ground or a fault internally in the ecm...

can anyone give me any other option or any other info on what else to test?
i know egr operates at past 2000 rpms and when engine is at op. temperature.

thanks.

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1990 ford ranger 2.3L
1999 Ford Ranger 2.5l

God bless!