Hold on there, pardner. I know what the drawings in Haynes look like. I know the drawings in Volvos green books. Like most here, I've squinted at the reproductions in Bentley. Those you do NOT need to send me PM or link. I want to see just one example of a schematic you DO like. That will help with interpretation. Yes, there is a learning curve associated with every industry's peculiarities in creating service information meant for technicians. I can help you with questions on the symbols and conventions used in Volvo's wiring diagrams, which are "schematic" by definition, but not schematics in the sense electrical designers use the term.

Here's a link. Tell me if you think this is what you mean by standards and easily read, and its function understood: k-jet controller

The measurements you are thinking about have in most cases been posted on this board, so the baseline is already available to you. And yes, you could wire in your cheap AC voltmeter across your CPS and leave it in the passenger's footwell for when it craps out again. I can tell you the pitfalls of that approach as well, but in a thread dedicated to solving your no-start, not this one.


--
Art Benstein near Baltimore

There are 10 different kinds of people.
Those who understand binary, and those who don't.