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Power Steering Fluid: Inspection

  1. Check fluid level  :
    1. Keep the vehicle level.
      2. NOTE: HINT: Check that the fluid level is within the HOT level range on the reservoir. If the fluid is cold, check that it is within the COLD level range.
    2. With the engine stopped, check the fluid level in the oil reservoir.

      If necessary, add fluid. Fluid: ATF DEXRON®II or III  .

    3. Start the engine and run it at idle.
    4. Turn the steering wheel from lock to lock several times to boost fluid temperature. Fluid temperature: 80°C (176°F)  .
      Fig 1: Identifying Brake Fluid Reservoir Fluid Level Marks
      G01082975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check for foaming or emulsification.

      If there is foaming or emulsification, bleed power steering system. See REPLACEMENT .

      Fig 2: Inspecting Brake Fluid For Air Bubbles
      G01082976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. With the engine idling, measure the fluid level in the oil reservoir.
    7. Stop the engine.
    8. Wait a few minutes and remeasure the fluid level in the oil reservoir. Maximum fluid level rise: 5 mm (0.20 in.) 

      If a problem is found, bleed power steering system. See REPLACEMENT .

    9. Check the fluid level.
      Fig 3: Measuring Brake Fluid Level Fluctuation
      G01082977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check steering fluid pressure  :
    1. Disconnect the pressure feed tube from the PS gear. See REMOVAL .
      2. NOTE: Check that the valve of the SST is in the open position.
      Fig 4: Installing Brake Fluid Pressure Gauge
      G01082978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST, as shown in the illustration below. SST 09640-10010 (09641-01010, 09641-01020, 09641-01030).
    3. Bleed the power steering system. See REPLACEMENT .
    4. Start the engine and run it at idle.
    5. Turn the steering wheel from lock to lock several times to boost fluid temperature. Fluid temperature: 80°C (176°F)  .
      6. NOTE:
      • Do not keep the valve closed for more than 10 seconds.
      • Do not let the fluid temperature become too high.
      Fig 5: Diagramming Brake Fluid Pressure Test With Valve Closed
      G01082979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. With the engine idling, close the valve of the SST and observe the reading on the SST. Minimum fluid pressure: 6,374 kPa (65 kgf/cm 2  , 925 psi)  .
    7. With the engine idling, open the valve fully.
      8. NOTE: Do not turn the steering wheel.
      Fig 6: Diagraming Brake Fluid Pressure Test With Valve Open Wheels Centered
      G01082980Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Measure the fluid pressure at engine speeds of 1,000 rpm and 3,000 rpm. Difference fluid pressure: 490 kPa (5 kgf/cm 2  , 71 psi) or less  .
      9. NOTE:
      • Do not maintain lock position for more than 10 seconds.
      • Do not let the fluid temperature become too high.
    9. With the engine idling and valve fully opened, turn the steering wheel to full lock. Minimum fluid pressure: 6,374 kPa (65 kgf/cm 2  , 925 psi)  .
    10. Disconnect the SST. SST 09640-10010 (09641-01010, 09641-01020, 09641-01030).
    11. Connect the pressure feed tube to the PS gear. See INSTALLATION .
    12. Bleed the power steering system. See REPLACEMENT .
      Fig 7: Diagraming Brake Fluid Pressure Test With Valve Open Wheels At Full Lock Position
      G01082981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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