Working on a 98 with a 5.9 magnum. Got a code P0443.
What I've done so far is I've tested the solenoid and its functioning correctly, Inspected fuses, and connections. Once I started testing electrical readings I was finding the control wire to the purge was showing a constant 3.2v and 12v form the power wire. Traced the wires and found no shorts, or damaged wiring. I started the engine and was seeing 12v across both wires, with no fluctuation. Not sure if the signs are pointing towards a bad PCM internal ground. The PCM has been replaced twice. I don't have the tools to actuate the solenoid manually. Not sure if I'm missing anything here.

On another note, the previous mechanic had the purge valve lines installed backwards, not sure if that could've caused damage to anything.

 

All the AI in the world could not tell me exactly how Chrysler determines the purge solenoid circuit is faulty. Looking at the wiring diagram I'm guessing the PCM wants to see 12V at the solenoid control pin when not activated. Sounds like there is 12V on both pins of the connector when running so this checks out. Did you check for 12V at the PCM side, connector 3 pin 20 pink/white wire ? You'll need to open the connector and back probe the wire. Also verify there is no voltage when you pull fuse 11 on the inside to eliminate any shorts in the wiring loom.

Given that the PCM has been replaced already I would think that's not the issue. The purge lines having been hooked up working won't cause any electrical faults.