Read the first answer here:Where_can_you_find_a_1993_Subaru_Legacy_engine_diagramThere are Haynes and\or Chiltons guide for every Subaru Legacy\Outback to 2005(US Models) you can find the specific one you need on www.haynes.com they have engine and body diagrams.
Chilton's book covers it .
== == mitchell on demand is best source of wiring diagrams. better than subaru in my opinion
Engine diagrams can be found on sites that help people build engines. Check out a site such as Autozone. They may have diagrams available for free to follow.
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You can find them on the Autozone web site.
When working on a car engine it is important to have a diagram. Free Diagrams can be found in the owners manual and in the repair manual.
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my diagram is a sticker right inside the engine compartment (ford) autozone has most of the diagrams on their site, too.
You will find a free wiring diagram at: www.veryuseful.com/mustang/tech/engine#Diagrams Good Luck!
A Google search turned up a hand full of diagrams. https://www.google.com/#q=2001+subaru+outback+3.0+serpentine+belt+diagram
Try alldatadiy.com for diagrams - but you have to pay a minimal fee.