Most of the time the pump will make a whining noise when used. this is a warning for a bad malfunctioning pump. if there is no noise during a hard turn, it will most likely be an issue with the steering assembly. heres a step by step guide on checking the pump.
Check the fluid levels of your vehicle first. Add power steering
fluid if necessary before you proceed any further.
Connect the power steering pump and hose to the pressure gauge and
shutoff valve. Fit the hose to the power steering pump correctly. Make
sure the shutoff valve is open before test the power steering pump.
Idle the engine
while turning the steering wheel all the way to the right and all the
way to the left to release any air from the power steering pump.
Close the shutoff valve to check system pressure for about 5 seconds.
If the shutoff valve is closed longer than 5 seconds, your power
steering pump can overheat and this can cause damage to the pump
Compare the pressure reading against the manufacturer's specifications.
If the pressure is within limits, your power steering pump is working
correctly and you're ready to roll.
Troubleshoot if the pressure reading is not the same as the manufacturers specifications. Consult the manual for your vehicle
or for your power steering pump (if you just installed a new one) to determine the source of any further problems.