ECM wiring diagram needed

What do you need help with? The easiest way to do this is to remove the computer and wiring the same way at a salvage yard. Look for a car with the same engine size and from the same year. The biggest thing to be aware of is it's the splices that can cause trouble in the future. Specifically, solder them, then do not use electrical tape to seal them. That will unravel into a gooey mess on a hot day. Slide a piece of heat-shrink tubing onto one of the wires. I like to strip about 3/8" insulation from the car's wire and from the wire on the plug, then slide the strands into each other. Press down any ends that are sticking up, then solder that splice. Check again for any sharp points and press them down with a needle nose pliers. This takes some practice before it becomes easy. You might want to look at a holding fixture to hold the wires while you solder them. Harbor Freight Tools has one with two alligator clips and a magnifying glass.

The reason to check for sharp points sticking up is those can poke through the heat-shrink tubing as it is heated. That tubing makes for a nice, tidy joint. Whenever you use it under the hood, always use the stuff with hot-melt glue inside to seal out moisture. That's not as important inside the cabin.