How can I test my injector connector to see if it's damaged inside? I have power at the ground wire (all the time) with out the key on. Injector always stays on, I have checked this with fuel rail off. I traced the driver wire to PCM, wire is not damage. Is there a free way to test the PCM to the pin, to see if there is always power? Could my injector cause the PCM to go bad, mine is always running. Maybe it overheated or something?


Not a ford truck this time

 

The injectors are all tied together with a power all the time wire from the EEC relay. Anytime the key is on, they have power. The PCM grounds the other side of the injector to make it fire.

If you think the PCM is causing the problem, unplug it and see if the problem goes away.

 

Thanks. I unplug the PCM and it didn't change anything. I learned something new today. I pulled the fuel rail and turned the key on. Only the problem injector (driver ground) sprayed fuel for four seconds, every time I turned key to on. It didn't take long to fill up a plastic bottle. It should not spray fuel when I turn the key to on. I switched the injectors over and the same thing happened. Still sounds like the PCM to me ???? I wounder is something else needs to be replaced with the PCM? Can I test the driver pin on the PCM to see that its bad?

 

If the wire that goes to the PCM has rubbed and is touching ground somewhere, it will fire when the key is switched on.

 

I traced the ground wire ( driver ) it has not rubbed or is touching ground any where.