Thought I'd start up another topic on the fueling systems, more accurately injectors. These seem to vary between truck manufacturer's with combinations of Common Rail, EUI and HEUI.
One of my go to setups when looking for a possible fuel related fault is to have the Crankshaft sensor, cylinder ID (camshaft or injector current) and the rail pressure sensor. By including a frequency math channel on the crankshaft sensor we can then see the relationship between crankshaft speed and the rail pressure and if there are any obvious, repeating, patterns we can then determine if it's related to a particular cylinder. This is something you can see in more detail in the following link https://www.picoauto.com/library/case-s ... ic-process.
A while ago Sharpy posted a great case study featuring a Volvo FMX - viewtopic.php?p=99562#p99562, which had a fuel pressure fault. Carl then kindly chipped in with a capture showing a rail pressure drop which I hope he doesn't mind me adding here.
This will hopefully show that a scan tool can get you some of the way but the scope has the potential to show you more.
I'm not going to go into too much detail as I thought this might be a good for other to share any other tips and tricks or questions relating to diagnosing fuel systems.
You mention the math formula, crank(A,60) or freq(A), would you please elaborate on what that formula is doing and what the significance of the (60) is in the equation.