My check engine light came on because the terminals were not connected tightly. no. quite the contrary. if you have a "check engine" light on, disconnecting, or in this case replacing the battery will turn it off. you have a different problem.
Since all cars after '96 have OBD 11 it takes a scanner to remove the trouble codes. Auto Zone will do it for free. it does have obdII but the codes will be erased by unhooking the battery.
Remove the battery head(+v) for a while, then replace it and star the engine.
Replacing the water pump for that vehicle is 16.0 labour hours. Engine and transmission need to be removed.
The 2009 Toyota Sienna has a V6 engine.
The 2013 Toyota Sienna has a V6 engine.
The 2006 Toyota Sienna has a V6 engine.
The 2008 Toyota Sienna has a V6 engine.
The 2002 Toyota Sienna has a V6 engine.
The 2001 Toyota Sienna has a V6 engine.
The 2005 Toyota Sienna has a V6 engine.
The 2010 Toyota Sienna has a V6 engine.
The 2014 Toyota Sienna has a V6 engine.