The control valve is stuck or inoperative.

1. Clean the control valve.
2. Inspect the control valve.
3. Replace the control valve, as needed.

Refer to Power Steering Pump Replacement .

The pump ring is worn.

1. Inspect the pump ring.
2. Replace the pump ring, as needed.

Refer to Power Steering Pump Replacement .

The pressure plate is scored.

1. Inspect the pressure plate.
2. Replace the pressure plate, as needed.

Refer to Power Steering Pump Replacement .

The thrust plate is scored.

1. Inspect the thrust plate.
2. Replace the thrust plate, as needed.

Refer to Power Steering Pump Replacement .

The rotor is scored.

1. Inspect the rotor.
2. Replace the rotor, as needed.

Refer to Power Steering Pump Replacement .

The pressure plate is broken.

1. Clean the pressure plate.
2. Inspect the pressure plate.
3. Replace the pressure plate, as needed.

Refer to Power Steering Pump Replacement .

The thrust plate is broken.

1. Clean the thrust plate.
2. Inspect the thrust plate.
3. Replace the thrust plate, as needed.

Refer to Power Steering Pump Replacement .

The vanes are sticking in the rotor slots.

1. Clean the vanes.
2. Inspect the vanes.
3. Replace the vanes, as needed.

Refer to Power Steering Pump Replacement .