In quest to make choke work I have found no power at LB at #1 Water Temp Switch.
Heat hazard warning light is always on which means either that sensor is open (normally it is closed unless it gets hot, then it opens, stopping signal to ECU which will then signal warning light via pin U of ECU. So, if I'm wrapping my head around all this, either the heat hazard sensor is open, triggering ECU, or the power to it isn't there, which would also trigger the light. So I have two indicators that I'm not getting power out of the ECU from pin D (LB wire). So why wouldn't I?
Plan:
Check for power at LB at #2 Water Temp Switch (on the radiator I believe, what does this switch trigger?)
Check for power at pin D of ECU (if it is possible to do that? If I can isolate that wire as it exits the ECU I can stick a straight pin through it and use that to test for voltage I guess) I haven't even looked at it yet to know.
I haven't found an explanation of the whole ECU, is there one? Like which circuit is triggered by what? It is very complicated but quite interesting. Rube Goldberg would be quite proud, especially since 90% really isn't even necessary.....or so it seems.

 

No power at #2 Water Temp Sensor. The ECU is there, a harness is on it but I did not yet dig deeper. Any ideas?