Hi
That looks like a good project - will be nice when you have it all finished I think

It's good that you bought the book, that should help.

Sorry, I'm not with my car until weekend to check the tests but I will have a look then if you haven't fixed the problem.

So the temp sensor reading goes to the ecu which then varies the mA @ the pressure reg to enrich fuel supply when the engine is cold.

You need to measure the mA (connect the test kit in series) @ the regulator (plugged in properly and working) when you are cranking the cold engine. It should be anywhere around 50mA to 160mA approximately, but well over 0 for sure.

If the reading is not correct then trace the ohm value from the temp sensor to the ecu (it tells you in the book which pin number that is on the ecu).

So hopefully this way you can tell whether it is the wiring from the temp sensor to ecu, or the wiring from ecu to regulator, or the regulator itself which may be faulty.

hope this helps - good luck