With fuses on the battery, you have the late prod '93. Factory WDM is available on volvowiringdiagrams.com. Your eyes will thank you.

Don't follow the steps in my photos unless you understand them because there's a temptation to substitute tools you don't have -- such as timing light, LED circuit tester, incandescent circuit tester. At best you'll be confused, at worst you might damage something in addition to the problem.

Generally, make voltage measurements with everything plugged in and turned on, not to the end of unplugged terminals. Make resistance measurements in just the opposite fashion, unpowered, unplugged.

Yes, I think your measurements at the CPS were OK. Just be sure the pins don't push back in the car-side connector when you plug that new CPS connector in.

If you don't get 12V at the blue wire on the power stage connector, that's where you need to focus. According to the map, it comes from the blue wire on the #15 terminal of the coil.

I still don't know what relay you speak of, but I'm pretty sure it is irrelevant -- maybe the AC pusher fan relay, certainly nothing to do with spark. You say left fender? US driver's side?
--
Art Benstein near Baltimore

The Art Collector's Wife:

A New York attorney representing a wealthy art collector called and asked to speak to his client. "Saul, I have some good news and, I have some bad news."

The art collector replied, "I've had an awful day; let's hear the good news first."

The lawyer said, "Well, I met with your wife today, and she informed me that she invested $5,000 in two pictures that she thinks will bring a minimum of $15-20million. I think she could be right."

Saul replied enthusiastically, "Well done! My wife is a brilliant businesswoman! You've just made my day. Now I know I can handle the bad news. What is it?"

The lawyer replied, "The pictures are of you with your secretary.”