The wiring diagrams that I provided above are the complete circuit from the injector to the ECM.
It is just a straight shot from injector to ECM. I am not sure if I am understanding how you are testing these but let me explain how they work and then you tell me if that makes your testing make more sense.
The injector is provided 12 volts on the red wire at all times the key is on. Then when the ECM wants to fire the injector it grounds the circuit on the other wire and the circuit is completed and the injector opens.
So in other words, it is an open circuit until the ECM wants to open the injector and the ECM provides the ground and the injector fires. So if you are testing the wire from the injector to the ECM for a short to ground. You should have ground if the injector is opening.
However, if you have disconnecting the injector and ECM and testing just the wire and you have a short to ground then you have a wiring issue.
If you have the ECM still plugged in and you are testing for a short to ground with just the key on and you have ground then the ECM is grounding the injector when it should not.
Let me know if I am misunderstanding something. Thanks
Wednesday, December 23rd, 2020 AT 6:16 PM