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"Injection Control Pressure" and "Injection control regulator Duty Cycle" are two of them. This will show you the ICP and IPR sensors. You can also look at the voltage I believe
ICP should be 450-500 at idle at about 11% DC and it should be 2800 at about 35% DC at WOT if your pump is providing everything asked of it. If your truck is stock (not tuner or chip) it should do this without any problems. If you are running a chip, you will probably not be that high. It isn't anything to worry about, it would just mean that you are not getting quite as good of performance as you could.
you cant actually look at the HPOP. the ICP and IPR DC are the output of the HPOP.
Example:
If you have a low ICP (1600psi) and a hign IPR DC (90%) @ 1900 rpm your HPOP is straining to create pressure.
Mine is working good and at 2600rpm the icp can hit 3200psi with a 41% duty cycle
True that some can have issues and the HPOP be perfectly healthy. But for me it's definately a weak HPOP. No leakdowns, no sticking IPR. I've checked and checked hoping for something else that was a cheaper solution. I'm just waiting for Bob R. to finish testing his Pulse unit and get it on the market. I went on his waiting list as soon as he posted info about it.