Can anyone test a PCM.

Injector not getting signal to spray fuel, so I went through diagnostics. End result, I purchased a new PCM. However, still having problem. I have double checked / triple checked connectors and sensors. Starting to wonder if the new PCM is bad also but I don’t want to throw another $200 away.

I can get engine to run by "manually" touching ground from battery to stick pin I put in the ground wire to the injector.