John -

I've never done that test, but I would think you should have everything plugged in to perform the test. You might have to remove the ECU to get at the wiring, rig whatever you need to result in a temporary pigtail for those two connections, plug it back together and read the voltage on the pigtail leads.

It might be easier to identify the wires without removing anything and probe them straight away if you can get to them without taking out the ECU. #19 is green/white and #24 is black.

Frank

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