Utmost gratitude for sharing this life saving FSM. I have learned and understood the system a lot as I am still trying to restore the steering back to it's original condition. I have a feeling that I'm going towards the right direction, thanks to your generous inputs and these FSM pages. BTW...
I have exactly the same problem with my hdj81 PPS variable assist. Had steering pump rebuilt, bleeding well done but relentless difficulty operating steering wheel due stiff/hard. Realised later the steering box had a solenoid. Removed and tested it direct on 12V battery. Valve was stuck inside...