So, even though the truck is commanding the IPR to fully close, that's not an indication that it's actually DOING it. But remember.the IPR% is a COMMANDED value, not an actual position feedback. Since you're seeing 85% on the IPR, what the truck is doing is closing the IPR all the way to try and build more HPO to fire the injectors - but it's maxed out at 370psi. What we DON'T know is the position of the IPR. 58v-.70v which correlates to ~300-400psi of ICP (exactly what you're seeing), so it looks as though your ICP sensor and wiring are correct. 23v KOEO - totally normal (I think Ford spec calls out ~0.21v or so depending on model year). ICP pressure can read whatever it wants (some tuners actually manipulate this data when writing their tunes to get more out of the truck), but ICP voltage will always be correct - this is why you always check both. There is a table out there somewhere that will show you the values (do a google search for "6.0 powerstroke ICP pressure to ICP voltage conversion table"). So, as pressure goes up, voltage should increase as well. ICPv is a ~0-5v signal that correlates to ~0-4000+psi of ICP. When you're checking ICPv vs ICP while cranking, what you're doing is making sure those values match in relation to each other and not defaulting to a random number. Click to expand.When you check ICPv KOEO, you're checking for a biased sensor (basically, making sure the truck's signal with the ICP sensor is communicating correctly.
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