I tried this test last night. I either didnt follow the instructions correctly - most likely, or my check engine light isn't working - less likely.
here is what I did. at the beginning of this thread, I think there are 2 methods to get codes - with the check engine light, or without. with the check engine light,I think it tells me to just ground the STI. so, I took a paper clip, stuck it in the STI plug, and then wedged the other end into the sheet metal where the hood prop mounts. Decent wedge, but not a perfect connection.
I turned the key to run, and heard extra relays come on, and stop. including the fuel pump. sat there for 2 minutes, and no light.
so, feeling like I need to ground more connectors, or make the STI a better ground.
What I don't know is - where is the check engine light on a Gen 1, 1988 early dash? my book doesn't even tell me. nor does google.
The rest of the procedure is laid out, and I have codes listed, along with what they should mean. I used a piece of flattened 12 gauge solid-core "romex" house wiring, because it was lying around. I flatted it with some pliers.
The bulb I also had lying around, and some wiring for it. I still have that thing; works well. I can build one easily, provided I find another socketed mini light (I think they're sold 3rd party, never bothered to check).