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That won't tell you if the PCM is sending the ground signal or not, that'll just tell you if the relay is good when the PCM sends the signal. It's more likely that the relay is bad than the PCM not working right. I suppose the only way to tell without a scanner would be to disconnect the PCM side wire and hook an ohmmeter inline with ground. Key off, infinite ohms; key on should show a path to ground.
There is a down side though. The PCM only sends that signal if certain conditions are met, and those conditions aren't met in the summer where I'm at. If you would remove that signal cable and ground the post out with a separate piece of wire, you can test the relay quick and easy no matter the temp. If the relay is clicking, then it's good. Remove the big wires and clean up the contact surfaces, as they can get corroded. Try it again, and life should be good.
I'm personally not worried about a little smoke at start up, just so long as it goes away. It's something I've known diesels to do for many years, even when everything is working as it should. I don't know why it would be smoking during the summer though. What's the morning temps like where you're located?
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776