Have Ford Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question.What size engine due you have in your Expedition?
Okay thank you for that, the PCM relay and coils get there power from two fuses both located in the interior fuse panel. These fuse are the F1-28 fuse and the F1-34 fuse. Start first with checking these to make sure both have power in and out of them. See the wiring diagram in the link below for reference. Check these and post back with your results and we can work from there.https://dl.dropboxusercontent.com/u/104923897/Fude%20PCM%20Aug%204.pdf
Okay then now you need to check and see if you have key on power in and out of the EEC (PCM) relay. Check pins 2 and 3 for key on battery voltage and pin 5 for power out and pin 1 for a ground at the relay.
Pin #2 gets its power from the fuse F1-28 and if you sure the fuse is okay then you should have power at pin 2, with out power at pin 2 5 would be dead. Recheck the fuse and if it checks okay then you are likely looking at a bad fuse panel.
That would indicate a problem with the fuse panel as well. What happens if you supply power to this fuse?
Okay do you have power at the coils on the power wire (green/red) ?Do you have power at the injector on the red power wire?
You can find the red power wire at any one of the injector connector and you can find the red/green wire at any one of the coils. Both are the power supply wires and the key needs to be on while testing.
Okay if you look at the wiring diagram I sent you you will see that power to the coils comes from interior fuse panel from pin #7, do you have power out of the panel on pin #7 (red/green wire) ?
Yes, Im here all day. Post back when your ready.