Awesome, thanks.

That's the only temp sensor I could find in ETKA and the wiring diagrams. It is used by the ECU and the gauge in the instrument cluster. I guess that means the ECU itself handles the after-run fan. Interesting.

One of the funny things about the Ur-S4 is the number of different coolant temperature sensors on the engine. Everybody's got their own -- ECU, gauge, after-run, HVAC, radiator fans, etc. It makes sense to consolidate, it just becomes harder to figure out from the wiring...