A high internal leakage.

Check for internal leakage.

Refer to Power Steering System Test .

The steering gear valve spool is sticking or damaged.

Replace the steering gear.

Refer to Steering Gear Replacement .

A insufficient pump pressure.

Replace the pump.

Refer to the applicable procedure:

The fluid level is low.

Check the fluid level.

Refer to Checking and Adding Power Steering Fluid .