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Steering System: Repair

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEERING OFF CENTER REPAIR PROCEDURE 
    NOTE:
    • Check troubleshooting items for "steering off center" of "VARIABLE GEAR RATIO STEERING SYSTEM" (See VARIABLE GEAR RATIO STEERING SYSTEM  ).
    • Check that the "STRAIGHT ANG FLG" in the data list is "VALID".

    HINT:

    This is the repair procedure for steering off center.

    1. Inspect steering wheel off center.
      1. Apply masking tape on the top center of the steering wheel and steering column upper cover.
      2. Drive the vehicle in a straight line for 100 meters at a constant speed of 35 mph (56 km/h), and hold the steering wheel to maintain the course.
        Fig 1: Applying Masking Tape On Top Center Of Steering Wheel And Steering Column Upper Cover
        G04025473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Draw a line on the masking tape as shown in the illustration.
        Fig 2: Applying Line On Masking Tape
        G04025474Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the steering wheel to the center position.

        HINT:

        Look at the upper surface of the steering wheel, steering spoke and SRS airbag line to find the center position.

      5. Draw a new line on the masking tape on the steering wheel as shown in the illustration.
      6. Measure the distance between the 2 lines on the masking tape on the steering wheel.
      7. Convert the measured distance to steering angle.

        HINT:

        • Measured distance 1 mm (0.04 in) = Steering angle of approximately 1 degree.
        • Make a note of the steering angle.
          Fig 3: Drawing New Line On Masking Tape On Steering Wheel
          G04025475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Adjust steering angle.
      1. Draw a line on the RH and LH tie rod ends and rack ends respectively where it can easily seen.
      2. Using a paper gauge, measure the distance from the RH and LH tie rod ends to the rack end screws.

        HINT:

        • Measure both the RH and LH sides.
        • Make a note of the measured values.
          Fig 4: Applying Line On RH And LH Tie Rod Ends And Rack Ends
          G04025476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Remove the RH and LH boot clips from the rack boots.
      4. Loosen the RH and LH lock nuts.
      5. Turn the RH and LH rack ends by the same amount (but in different directions) according to the steering angle.

        HINT:

        One 360 degree turn of rack end (1.5 mm (0.059 in.) horizontal movement) equals to 12 degrees of steering angle.

      6. Tighten the RH and LH lock nuts to the specified torque.
        Fig 5: Identifying RH And LH Lock Nuts
        G04025477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Torque: 56 N*m (571 kgf*cm, 41 ft.*lbf) 

        NOTE: Make sure that the difference in length between the RH and LH tie rod ends and rack end screws is within 1.5 mm (0.059 in.).
      7. Install the RH and LH boot clips.
      8. Perform steering angle sensor zero point calibration (see CALIBRATION ).
  2. PERFORM VARIABLE GEAR RATIO STEERING SYSTEM CALIBRATION 

    (See HOW TO PROCEED WITH TROUBLESHOOTING  )

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