uncontrollable icp EXPERIENCED tech help needed - Ford Powerstroke Diesel Forum
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Old 10-09-2012, 09:56 PM
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Exclamation uncontrollable icp EXPERIENCED tech help needed

Ok so ever since ive had the truck ive had this issue P1280 icp low, i needed to smog it before registering so i took it in, a shop replaced the pcm because there were multiple other issues with the truck but they said the computer was the issue soo they replaced it and "smogged" the truck for me and i registered it.

SES light came back on a few days later due to all of the existing issues, i wasnt in a rush to fix it so i started picking away at the issues got everything else taken care of...

but this P1280 so i began with the wiggle test on connections, check for oil in connector etc, no change, replaced icp sensor no change, replaced the pigtail connector for the icp sensor no change, so i figure what next the oil preassure in the rails really is low? so i replace the IPR(it was coming loose and had a slight seapage) no change, the ICP goes to default voltage so it runs pretty good so i kept driving it with the light on and learned to live with it.
This has been over the past 2years and its that time to re smog it, so i talked to some of the guys at the local dealership tested voltage through the ICP circuit, had an open circuit so overlayed the 3 wires with new ones from the icp directly to the PCM. no change this is where im at now its been there for the past week and a half and the dont know what the issue is. Theyve checked all my work theyve even tried all new ICP sensor nothing... so what would be the next thing to do, besides contacting "ford tech hotline" is this sounding like its an actual oil pressure issue or electrical. i couldnt figure out my self how to do the diagnostic tests on an Auto enginuity scanner after the ICP goes to default but im trusting that the tech at ford has done these tests, theyre wanting to have the PCM rebuilt... not sure thats the issue
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Old 10-10-2012, 01:34 AM
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There is a small plug on top of the high pressure oil rails, almost dead in the middle on top, silver in color, allen head. There are orings on those. Its not likely to happen but has happened before, the orings on those can break down ever so slightly causing this particular issue. Had a truck in and out one of my bays for almost a month trying to figure it out. It was throwing the same code but really wasnt affecting the way it ran, i went though everything i possibly could and finally pulled those plugs just to see if that may be the issue and wouldnt ya know it the rings were cracked.


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Old 10-10-2012, 05:27 AM
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Are we talkin uvch? I've replaced those or something different. Hard to picture where that connector is in my head.

Actually I think I know what your talking about now that I think of it your referring to the threaded plugs for the oil rails. I've replace those plugs with a SS braided crossover line thinking maybe linking the two together would resolve this....

Now my other thought could the ipr not be commanded the right pressure due to wiring issues? This causing te PCM to go to default settings because the actual pressure Is too low? How would we check for this. The Ipr duty cycle test?

Last edited by freeride707; 10-10-2012 at 06:24 AM.
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