"REAL" Scantool

[MiscellaneousDave]

A power probe is a name brand of a tool, there are knock offs now. But the tool connects to both power and ground and can supply both power and ground with a button. So if you think your purge valve is bad you can power or ground it whichever it needs and turn it on to check operations.  If you are into diagnose problems check out south main auto.

That is pretty cool, and I assume a power probe can help you with to determine if a purge valve is operating at all, but what if it was only opening/closing to 80%?  You would need a tool to see that.