Diagnosing and repairing a faulty power steering system on a Hyundai Matrix requires a systematic approach. Start by checking the power steering fluid level and ensuring it is at the recommended level. If the fluid level is fine, inspect the power steering pump for any leaks or signs of damage. Test the power steering system for smooth operation and proper assist. If the issue persists, additional components such as the power steering rack or hoses may require inspection and potential replacement.