Check for a worn or loose drive belt.
It won't be the engine that's squeaking, it will most likely be a belt, take it to a mechanic to get the belts tightened up.
The 2013 Toyota Tacoma has an inline 4 engine.
The 2011 Toyota Tacoma has an inline 4 engine.
The 2009 Toyota Tacoma has an inline 4 engine.
The 2012 Toyota Tacoma has an inline 4 engine.
The 2008 Toyota Tacoma has an inline 4 engine.
The 2004 Toyota Tacoma has an inline 4 engine.
The 2005 Toyota Tacoma has an inline 4 engine.
The 2010 Toyota Tacoma has an inline 4 engine.
The 2003 Toyota Tacoma has an inline 4 engine.
The 2007 Toyota Tacoma has an inline 4 engine.
The 2001 Toyota Tacoma has an inline 4 engine.