If a toyota land cruiser makes a whining noise, what could be the cause?

The power steering pump is a very common reason why Your Toyota Land Cruiser might have a whining noise . If it gets too low on the fluid theyll make itll whine a lot. You need to check the fluid level and fill it back up to the factory fill line. The pump can also go out. To determine if it is the power steering pump, turn the wheel left and right with the vehicle sitting. Does the sound get louder while turning Thats a great indication that it is probably the power steering pump making noise.All of Your engine accessories will change their wine depending upon the RPM. Only the power steering pump will change with RPM or the steering wheel.