ICPR testing- Died on hwy- cranks but no start

Driving down the highway, truck instantly dies. It does not restart warm or cold.

-changed crank sensor. No change.

-checked all fuses (including fuel heater fuse as it shares the ECM fuse) fuse is good.

-checked fuel bowl, it is full of fuel and mechanical pump is working.

Now, what do you suggest I do from here:

My plan of approach is:

-Swamp IDM with known good part to confirm that one is ok
-Test ICPR- how do I do this? Can you test it?
-how do you test the HPOP output?

Any other thoughts?

thanks