factionos

the problem I am running into with checking the wiring is that it requires the car to be running, but cylinder #3 is under the intake manifold which has to be on the car to run. This leaves me with very limited ways of checking it

you are awesome! thank you for getting the diagram. now i just need to figure out if the PCM is the issue or a bad connection/wire

Tonight i wired in a replacement plug for #3 injector, unfortunately it did not fix the issue and i am still getting an open condition on #3 I'm starting to think its the PCM at this point, I really want to try and trace the wires for #3 back to the harness but everything is so tightly wrapped i am not sure what to do. Quote MultiQuote Edit

we are having a similar problem, about 2 weeks ago upon start up it started intermittently idling rough and driving poorly, the next time it was started it ran fine, then again it ran rough and finally the check engine came on. I got the code P0203 - Injector circuit / open cylinder #3 I thought that testing the #3 injector would be the first thing to check, I switched the #3 and #4 injectors and nothing changed. This leads me to believe the injector itself isn't the problem but perhaps the wiring? so I removed the intake manifold and did a couple things to determine if the spark plug or coil where part of the issue. switched the #3 spark plug with #1 switched coil pack from #2 and #3 neither had any effect and still had the same DTC of P0203 Tonight i wired in a replacement plug for #3 injector, unfortunately it did not fix the issue and i am still getting an open condition on #3 I'm starting to think its the PCM at this point, I really want to try and trace the wires for #3 back to the harness but everything is so tightly wrapped i am not sure what to do.

Update, so I removed the intake manifold and did a couple things to determine if the spark plug or coil where part of the issue. switched the #3 spark plug with #1 switched coil pack from #2 and #3 neither had any effect and still had the same DTC of P0203 at that point I put everything back together with #3 injector unplugged, I started the car and checked the voltage and it was the same as the other cylinders I checked. I then plugged the injector harness back in and #3 started back up and its running fine now. I have no idea what is going on at this point...

Hmm this was the first time I have had intake manifold off (we had the brake booster replaced about a year ago so its possible they may have removed it in the past during that repair) I am happy to try and trace the wiring at this point, do you happen to have a diagram of the PCM pin locations? I appreciate you listing them out I just need to know where to trace

So our Edge has only really had a few problems (brake booster cylinder, random airbag code we can't find) But now its gotten really bad, about 2 weeks ago upon start up it started intermittently idling rough and driving poorly, the next time it was started it ran fine, then again it ran rough and finally the check engine came on. I got the codes for P0203 - Injector circuit / open cylinder #3 I thought that testing the #3 injector would be the first thing to check, I switched the #3 and #4 injectors and nothing changed. This leads me to believe the injector itself isn't the problem but perhaps the wiring? Has anyone had experience with this?