Steering System Noise Definitions: Whine
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Whine is the general air-borne noise of the P/S pump. Whine is in the frequency range of 1 kHz to 4 kHz. Whine is generated when engine rpm, pump rotational natural frequency and pump/bracket natural vibration frequency align.