Low power steering fluid.

1. Add power steering fluid.
2. Check the system for leaks.

The pump belt is slipping.

Refer to one of the following procedures:

Sticky flow control valve.

Replace or clean the control valve. Refer to Variable Effort Steering System Check in Variable Effort Steering.

Insufficient pump pressure.

Refer to Power Steering System Test .

Faulty gear pressure relief valve.

Replace the faulty gear pressure relief valve.