Recently purchased a 94 850. Wanted to hook the Maximus scan tool up to it here at work but can't figure out where the adapter hooks up. Looks like a monster plug with a second little plug coming off of it. Any info would be a big help.

 

Read this:
https://www.volvoclub.org.uk/tech/se...s-NonTurbo.pdf

I assume non-turbo. If it's a turbo, it'll have an OBDII plug in the console.