You bet. Let's start with the ECT location... just to be sure you've got the right one.
We good? I actually imagined it on the other end of the engine, so it's a good thing I checked it out. You won't have many good sources for the sensor ground circuit nearby, but the MAP sensor would be one choice. The MAP is located on the top of your intake manifold upper plenum and is the only 3 wire sensor in the area. This picture shows the engine with the plenum removed.
Repair involves splicing a wire to the sensor ground circuit (dark blue/ dark green) from any other source you find or you can go all the way to the PCM. I say splice
because the wire just needs to tap into the circuit.
The power feed to the sensor (sense circuit, violet/ orange) can be taken near the PCM and run directly to the sensor connector, cutting all the old wire out in between.
Your PCM is located just forward of the battery and has two 40-way connectors. Print the wiring diagram if possible I sent earlier for reference while you're out at the van... it's handier that way.
Locate Pin 26 on the open (terminal) side of the connector and then find the violet/ orange wire on the back side. Cut it so that you have a good working length and connect tis wire to the same colored wire at the ECT connector.
If you choose to go to the PCM for the sensor ground circuit, you'll find it on the other 40-way connector at Pin location 43. THIS
wire must be left intact to service the rest of the engine, but you can strip a small section of insulation off to solder a wire to it for this purpose. Run that wire to the same dark blue/ dark green location at the ECT connector, where you can
cut the wire there to join with this jumper you've built.
I'd sure give these two wires a good tug even if you don't have a meter handy, J. It's a short path from there to the PCM and there really isn't much that can happen so I believe you'd find it pretty easy.