The problem with the diagram is that it doesn't show you all the wire and the loop that the O2 sensor harness makes to use the same body harness work fro auto trans and 5 Speed. The same thing can be said for the diagram I posted. There are some wiring and connections not shown for the auto trans for simplicity's sake..
Looking at this diagram, if you look at the pin 30, a/t side. The white/pink wire, it goes to starting/charging systems. But the m/t it doesn't. That would definitely feed 12 volts back. I wonder if that is my problem wire? If I was to find that wire and cut it, wonder if that would be it?
This is typically how 12v gets sent to pin 46 to begin with. In an Auto setup, the ground to pin 30 is sourced from the starter solenoid control wire. The red/blue one. I know it sounds confusing, and it is. But that is how Ford did it. They use the relay coil to get the ground when there is no 12v flowing through it, as that will read as a ground when not starting the engine. So if you ground pin 30, you will have a short when starting. Im starting to agree with JR, and I am thinking the previous owner did something fishy.Ok, if I'm looking looking at this right, can I not just ground pins 30 and 46 together at at the computer (to body) since my NSS is jumped anyways? It would be kinda of a waste to run a new wire to a jumped NSS switch?
No I can leave that unhooked and still have 12 volts with that scanner hooked up. But when I unhook that scanner with the bigger plug it goes away. I just started it, no more check engine light. Not sure what's going in but it's either that scanner or the main plug for scanner.The small plug with the blue butt connector on it. Does that show 12v?
That is correct for that circuit, that is the STI.I just checked that one with Butt connecter, it has 5 volts
I can see how the hood light would happen. Looks just like the otherNot sure the scanner is the issue. Some people have used the hood light connector by accident. That's why I asked if that plug had 12v on it. Scanner is battery powered correct? Nothing in the code test port should have 12v technically. The fuel pump ground may show it, when no ground is applied to the relay. The STO is a pulsed ground from the ECM, its tied into the check engine light. Which has 12v on the opposite side of it. STI is a 5v circuit, and SIGRTN(pin 46) is a ground. What are the voltages to the wires in the code test port?
No I just bought it. This was the first time using it. So that wire should have 12v?That is the fuel pump trigger wire, which I mentioned would have 12v when no ground is applied to it. So it looks like your scanner is the issue. Has it ever worked correctly before?
No I just bought it. This was the first time using it. So that wire should have 12v?
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