ICP is injection control pressure which is read by the ICP sensor. The ICP sensor uses a 5v Ref wire (5v positive power wire). The sensor reads high pressure oil (0-4000psi) and translates the psi to volts (0v-4.8 range). The more the pressure increases, the more the volts go up.
You can use that reading to determine the health of the HPOP system (High Pressure Oil Pump, standpipes, STC fitting, and Dummy plugs). If you have a small leak in the HPOP system or a weak HPOP, it will show up in a WOT (wide open throttle) run. The ICP sensor reads the pressure thru volts, if the HPOP has issues, the pressure will not be able to reach about 4.8v or 4000psi at WOT.
Some custom tune writers will fool the ICP pressure in the PCM to squeeze out more power. The tune will make it look like you have a weak HPOP by only displaying about 1500psi, so if you test the WOT run when tuned and only see 1500psi instead of 4000psi, you will need to do the test with the stock tune.
LOL, I use to be able to change my avatar thru my phone, but Autoguide app screwed that up right after Christmas!!
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2004 F350 CC DRW King Ranch
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