A high internal leakage.

Check for external leakage.

Refer to External Leakage Check .

The steering gear valve spool is sticking or damaged.

Replace the steering gear.

Refer to Power Steering Gear Replacement .

A insufficient pump pressure.

Replace the pump.

Refer to Power Steering Pump Replacement .

The fluid level is low.

Check the fluid level.

Refer to Checking and Adding Power Steering Fluid .