For 1990-2009 cars

Checks | Action
--- | ---
Check the power steering pump for insufficient pressure. | Replace the power steering pump.
Check the power steering pump flow control valve for sticking and improper operation. | Replace the power steering pump.
Check the pump drive belt for slippage. | Tighten the pump drive belt.
Check for air contamination in the power steering system. | Bleed the power steering system.
Check the hydraulic system. Test the power steering system pressure with a gage. | Replace the seals and the hoses as needed.
Inspect for a sluggish steering gear valve. | Clean the pinion valve assembly. Replace the pinion valve assembly as needed.