Re: WQ Fiesta XR4 Diagnostics/OBD2 Reverse Engineering
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Possibly
My understanding of the pSteer pressure switch was to detect extended pressure excursions and bump the idle to compensate - like when you're at full lock and are on the bump stops. It's on everything with or without EHPAS. You might be right, but I'm going to proceed assuming that the check for fluid pressure is in the pump itself. One of the videos in the preceding links was a motivator for me - that the pump is seeking to prime itself and see pressure so it can enter a steady state.
Installing one of these pumps and linking to one of the CAN buses at this point should ALREADY be viable for anyone with an XR4 - give me a bit of time and I'll check it runs on a 1.6 as well. It will change speed with RPM so should be good for parking, and low engine drag at high RPM. Rapid steering turns at high RPM - maybe not so much.
Luke
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