GM Service Manual Online
For 1990-2009 cars only

Special Tools

Power Steering Analyzer

Check the fluid pressure as follows to determine whether the trouble is in the pump or the gear unit.

Test Procedure

  1. Check the power steering fluid level and the power steering pump belt tension. Refer to Power Steering System Bleeding.
  2. Apply the park brake.
  3. Disconnect the high pressure line at the pump. Use a small container to catch any fluid.
  4. Connect the power steering analyzer to the power steering pressure hose from the power steering pump.
  5. Place the gear selector lever in PARK if the vehicle is equipped with the automatic transaxle or NEUTRAL if the vehicle is equipped with the manual transaxle.
  6. Open the gage valve fully.
  7. Start the engine and let it idle.
  8. Turn the steering wheel from lock to lock several times to warm the fluid to operating temperature.
  9. Increase the engine speed to 1,500 RPM.
  10. Caution: Do not leave the valve fully closed for more than 5 seconds, or the pump could be damaged internally.

  11. Close the gage valve fully, and read the pressure.
  12. Specification

    Refer to Power Steering Pump Specifications

  13. Immediately open the gage valve fully.
  14. Turn the steering wheel all the way to the left and the right. If the pressure is within the specified limits, the problem is not in the pump.