Jordan nicholson

Okay sorry for the late reply, been swamped with work lately. Finally time to get back to the project toy. Anyhow. This isb platform I am talking about has a full rebuild. The cam gear is correct for the year of engine 98.5-00. it has both new cam and crank sensors from that year of dodge as well. So I know I’m not messing around with unknown parts. The ECM for this block kicked the bucket a year ago. So I found a good used one, for the same style engine out of another truck. ( confirmed by cummins quick serve using each ESN.) I can read engine related code, and clear them with my scan tool. However, without the pcm I cannot live data stream with my scan tool. all that said, with a (non crank sensing ECM. Plugged in.) the truck starts instantly (01-/02ecm). MY SPARE TEST ECM with a ( crank and cam sensing ECM. No start) (98.5-00 ECM) THE CORRECT ECM fair to say the crank sensing circuit is not working correctly to sync cam and crank to start the engine? i know my ground and 5v ref circuits are good. So I assumed it would in fact be a can bus no start issue. Any more input would be awesome. thanks again

Hey guys so hoping I can get some help with my no start issue. 1998.5 24v cummins manual I swaped into my chevy. First of all. About a month ago I was driving down the highway and my truck shut off. Died and left me stranded. Got it towed back to my shop in town and I was sure the injection pump died. So I swapped out the pump With a spare one I had and did not fix my no start issue. I have 20 psi lift pump pressure, good fully charged batterys so it cranks over fast. I did do the vp44 hot wire test and it starts. being this engine is a 98.5-00 that uses the cam and crank sensor. When I rebuilt the engine I replaced both of them so I know their good. I was leaning towards the ECM being no good. I swapped in a TEST. ECM that I have, it is from a 01. The truck fires right up! So should be the ECM right? I swapped in another 98.5 ECM, still no start. for shits I tried a 3rd 98.5 ECM. Still no start when I put the 01 ECM in. Fires right up. I can read codes off of the obd2 plug I have wired in the truck. And clean them. I do have a p1689 code. WHAT I WANNA KNOW IS: -what is different between the 98.5-00 and 01/02 ECM that would allow my truck to run. - if in fact it is a can bus issue causing the no start. How would it start with the 01 ECM and not that 98.5. any input would be awesome! Thank you