N-14 Celect Plus injector issue in #3 hole

Definitely due an ECM connector pin out test with a meter first. Also check the pass thru connector in the head. You can start the truck and check the power to the injector solenoid nuts with a meter on millivolts or a noid light. Cummins Celect plus uses an injector drive module inside the ECM I have seen them go bad and take a brand new injector out as soon as you fire it up doesn't always get the new injector but is common. Also its best to swap the missing hole with a known good hole and see if it moves with injector or stays.

 

I would start by using a meter at the solenoid nuts, then unplug pass thru and check and compare ECM side of connector. Readings will pulse but should be equal. Cummins has about an equal chance of all these being the issue from wiring harness coming from ECM, pass thru connectors, and injector drivers in ECM. The whole unit will be replaced if its ECM you can't spend too much time here being sure it gets costly quick.

 

What I do is, I have kept the wiring off an old injector. I use it to plug into the conection out of the rocker box to test the pass threw. If you have an open conection then remove the bolt turn the conector 30 degrees and pull the passthru. Take a Pick and put it between the wires behind the injector conector. release the conector and test the injector for continuity. No need to even remove the valve cover, and you know. You can buy the passthru with the "O" ring or without, and the "O" ring seperate.
Just a thought!

 

I rob every connector I can get my hands on and get by with it.

 

I have found that many times the pass thru connector is tempature sensitive. Most fail at a higher heat, but some will fail at a mid range. That is why having the wire from an injector is such a great thing you disconnect the injector and test right away. There is no problem with the injector core charge and you also get a connector to use if needed.
The ECM does not bring up a code.
Just a thought!