The good people down at the
North Carolina Toyota Territory Off-Roaders Association have a number of Service Manuals in PDF, including
2005-2006 Toyota Tacoma FSM 1GR-FE & 2TR-FE "This version contains multiple PDF files that are linked in separate index pages for access. The FSMs included are the Repair Manual and Wiring Manual."
That last link is a 205MB zip file. If you're not sure, go there and look at the on-line version. They have manuals going back to
1985-1994 Toyota Pickup and 4-Runner Gasoline FSM 22R-(E). And the best part? They're free!