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To change the water pump on a 2003 Toyota Echo, start by disconnecting the battery and draining the coolant. Remove the serpentine belt and any components obstructing access to the water pump, such as the timing cover. Unscrew the water pump bolts, replace the old pump with a new one, and ensure to replace the gasket. Reassemble everything in reverse order, refill the coolant, and run the engine to check for leaks.
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the water pump is part of the timing belt or chain. you have to take the belt or chain off to change the water pump. if you change the water pump, change the belt too.
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no you do not have to change the timing chain when changing the water pump.