My name is ***** ***** I will try to assist you.
If you have no voltage going to any of the sensors on the truck, does the engine even run? The truck shouldn't be running at all.
Is this a EGR or non EGR? 2004 was a split year on that.
What sensors are you testing that have no voltage? There should be a fuse down near the batteries that goes to a size 6 or 8 cable that feeds the ECM. It will be a smaller red cable. Chase it and see if that fuse is blown. If it isn;t there, check to see if it is at the starter. If you look HERE at the diagram, in the middle of the diagram at the top, you can see the wire that ends at the plug. That is the power wire that feeds the ECM to power the sensor. Now if the truck IS RUNNING and you have no voltage going to the sensors, the ECM is bad. There is no way around that. If the tuck IS NOT RUNNING then check for that fuse for the power.
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