N14 won't start!

[Ruger_556]

Cummins N14 won't start after sitting for a few months. No smoke while cranking and flashing code 322 (Injector circuit) Where do I start?

 

[John Deere]

Far from an expert, but I spent many hours chasing wires on one last year. I would start by checking the wiring and connections at the ECM.