This is a pretty broard but the experts here may be able to

[Mr Revhead]

Yes, but more so the 3S as the pump is driven off the cam belt.
Several times during my time at Toyota a customer wouldn't want to spend the extra on the pump at cam belt time. Then a few months later they come in demanding we fix their car for free because the cam belt has snapped.
On pulling it apart, lo and behold, seized water pump!

[Rob]

These are one of the easier cambelts to do. All 'S' series engines are non interference engines so if it does snap its only an inconvenience nothing major.