Pinpoint Test G: Power Steering Pump / Steering Rack Noise - Noise Specific Diagnostics (Grunt / Moan / Whine / Whoop)

1. Ascertain the specific type of noise present in the power steering system (see glossary of noise terms above)

Is the noise either a grunt, moan, whine or whoop?

• Yes: GO to  G2.
• No  : GO to PINPOINT TEST H .

1. Flush the power steering system

Is power steering system noise still evident?

• Yes: GO to  G3.
• No  : When all remedial actions have been completed, perform final checks for steering system noise GO to PINPOINT TEST J .

1. Ensure the power steering fluid is cold
2. Insert a temperature probe into the power steering fluid reservoir and connect to a suitable digital thermometer
3. Start the engine and allow to idle for 5 minutes. Then check the power steering fluid temperature

Is the power steering fluid temperature greater than 80 degrees Celsius?

• Yes  : Check for hydraulic system blocks at the power steering fluid reservoir. Remove a small amount of fluid and use a mirror to visually check the state of the filter in the reservoir (for guidance on filter blockage refer to Component Tests in this section: COMPONENT TESTS ). If the filter mesh is more than 30% blocked, then replace the reservoir assembly. When all remedial actions have been completed GO to  G4.

  If the filter mesh is less than 30% blocked, check power steering hydraulic hoses for kinks and replace as required. Allow the power steering fluid to cool to 20 degrees Celsius. Start the engine and allow to idle for 5 minutes. Then check the power steering fluid temperature. If the power steering fluid temperature is greater than 80 degrees Celsius, proceed to power steering system pressure checks GO to  G5. If the power steering fluid temperature is less than 80 degrees Celsius, GO to  G4.

• No: GO to  G4.

1. Check that the power steering system hoses are correctly installed and correctly routed and rectify as required
2. Check the power steering system hoses for damage and rectify as required
3. Check the integrity of the power steering system hose clips and brackets. Replace any defective clips/brackets as required
4. Check that the power steering system hoses are securely clipped into position. Rectify as required
5. Check the torque of the screws/nuts securing the power steering system clips/brackets, the power steering pump and the power steering pump mounting bracket. Adjust or replace fixings as required

Is the power steering system noise still present?

• Yes  : If noise is still evident, proceed to power steering system pressure checks, GO to  G5.
• No  : When all remedial actions have been completed, perform final checks for steering system noise GO to PINPOINT TEST J .

1. Refer to the appropriate section of the service information and conduct a power steering system pressure test

Is the power steering system pressure within specified tolerances?

• Yes  : GO to PINPOINT TEST H .
• No  : Replace the power steering pump

  Check again for power steering system noise. If noise is rectified, perform final checks for steering system noise GO to PINPOINT TEST J .

  If noise is still evident, GO to PINPOINT TEST H .