POWER STEERING SYSTEM ON-VEHICLE INSPECTION


  1. INSPECT DRIVE BELT


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      Visually check the belt for excessive wear, frayed cords, etc. If any defect is found, replace the drive belt.

      Tech Tips

      Cracks on the rib side of the belt are considered acceptable. Replace the belt if there are any missing ribs.

  2. BLEED AIR FROM POWER STEERING SYSTEM


    1. Check the fluid level.

    2. Jack up the front of the vehicle and support it with stands.

    3. Turn the steering wheel.


      1. With the engine stopped, turn the steering wheel slowly from lock to lock several times.

    4. Lower the vehicle.

    5. Start the engine. Run the engine at idle for a few minutes.

    6. Turn the steering wheel.


      1. With the engine idling, turn the steering wheel to the left or right full lock position and hold it there for 2 to 3 seconds. Then turn the steering wheel to the opposite full lock position and hold it there for 2 to 3 seconds.

      2. Repeat the step above several times.

    7. Stop the engine.

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      Check for foaming or emulsification. If the system has to be bled twice because of forming or emulsification, check for fluid leaks in the system.

    9. Check the fluid level.

  3. CHECK FLUID LEVEL


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      Keep the vehicle level.

    2. With the engine stopped, check the power steering fluid level in the oil reservoir. If necessary, add power steering fluid.

      Power steering fluid (for TMT made)
      "TEXAMATIC 1888" or equivalent
      (for TSAM made)
      "TEXAMATIC 1322S" or equivalent

      Tech Tips

      If the fluid is hot, check that the fluid level is within the HOT range on the oil reservoir. If the fluid is cold, check that the fluid level is within the COLD range.

    3. Start the engine and run it at idle.

    4. Turn the steering wheel to the left or right full lock position, and then the wheel to the opposite full lock position. Repeat several times to raise fluid temperature.

      Standard fluid temperature
      75 to 80°C (167 to 176°F)
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      Check for foaming or emulsification. If foaming or emulsification is identified, bleed air from the power steering system.

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      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 increase
      5 mm (0.20 in.)

      If a problem is found, bleed air from the power steering system.

    9. Check the fluid level.

  4. CHECK STEERING FLUID PRESSURE


    1. Disconnect the pressure feed tube (for TR series engine, Click here; for 1GR-FE, Click here; for KD series engine, Click here; for 5L-E, Click here.

    2. Connect SST as shown in the illustration on the next page.

      SST
      09640-10010   ( 09641-01010, 09641-01020, 09641-01030 )

      Note

      Check that the value of SST is in the open position.

    3. Bleed air from the power steering system.

    4. Start the engine and run it at idle.

    5. Turn the steering wheel to the left or right full lock position. Then turn the wheel to the opposite full lock position. Repeat this several times to raise fluid temperature.

      Fluid temperature
      75 to 80°C (167 to 176°F)
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      With the engine idling, close the valve of SST and observe the reading on SST.

      Minimum fluid pressure (for KD and TR series engine)
      8800 kPa (89.7 kgf/cm2, 1276 psi)
      Minimum fluid pressure (for 1GR-FE and 5L-E engine)
      8300 kPa (84.6 kgf/cm2, 1204 psi)

      Note


      • Do not keep the valve closed for more than 10 seconds.

      • Do not let the fluid temperature become too high.

      If the pressure is not within the specified range, check for fluid leaks and replace parts as necessary.

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      With the engine idling, fully open the valve.

    8. Measure the fluid pressure at engine speeds of 1,000 rpm and 3,000 rpm.

      Fluid pressure difference
      490 kPa (5 kgf/cm2, 71 psi) or less

      Note

      Do not turn the steering wheel.

      If the pressure is not within the specified range, check for fluid leaks and replace parts as necessary.

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      With the engine idling and the valve fully opened, turn the steering wheel to the full lock position.

      Minimum fluid pressure (for KD and TR series engine)
      8800 kPa (89.7 kgf/cm2, 1276 psi)
      Minimum fluid pressure (for 1GR-FE and 5L-E engine)
      8300 kPa (84.6 kgf/cm2, 1204 psi)

      Note


      • Do not maintain the lock position for more than 10 seconds.

      • Do not let the fluid temperature become too high.

      If the pressure is not within the specified range, check for fluid leaks and replace parts as necessary.

    10. Disconnect SST.

      SST
      09640-10010   ( 09641-01010, 09641-01020, 09641-01030 )

    11. Connect the pressure feed tube (for TR series engine, Click here; for 1GR-FE, Click here; for KD series engine, Click here; for 5L-E, Click here.

    12. Bleed air from the power steering system.

  5. CHECK STEERING RESISTANCE

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    1. Center the steering wheel.

    2. Remove the steering pad Click here.

    3. Start the engine and run it at idle.

    4. Measure the steering resistance in both directions.

      Steering resistance (Reference)
      5.5 N*m (56 kgf*cm, 49 in.*lbf)

      Tech Tips

      Tire type, tire pressure and type of surface beneath the vehicle should be taken into consideration before making your diagnosis.

    5. Tighten the steering wheel set nut.

      Torque:
      50 N*m  { 510 kgf*cm, 37 ft.*lbf }

    6. Install the steering pad Click here.