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Home >> Lexus >> 2020 >> LS 500h AWD >> Repair and Diagnosis >> Suspension >> Wheel Alignment >> Wheel Alignment - Service Information >> FRONT WHEEL ALIGNMENT (for AWD) >> Adjustment [10/2017 - 10/2020] >> Procedure

Adjustment [10/2017 - 10/2020]: Procedure

  1. INSPECT TIRES 

    Refer to INSPECTION [10/2017 - 10/2020]

  2. ADJUST STANDARD VEHICLE HEIGHT (w/ Air Suspension) 

    HINT: 

    Check the vehicle condition when operating to the standard vehicle height setting.

    • Perform the work with the vehicle stopped on a flat surface.
    • Make sure the hood is closed.
    • Make sure the luggage compartment door closed
    • Set the shift lever to P.
    • Make sure the courtesy lights are not on.
    • Do not depress the brake pedal.
    • Perform height adjust from outside of the vehicle to avoid vehicle height changes due when getting out of the vehicle.
    1. Record the vehicle setting conditions on the multi-information display.
    2. Get out of the vehicle and bounce the vehicle up and down at the corners to stabilize the suspension.
    3. From the outside of the vehicle, select access mode and turn it off via the vehicle setting conditions on the multi-information display.
    4. Operate the height control switch from outside the vehicle and adjust the vehicle height to HIGH
    5. After vehicle height control is completed, operate the height control switch from outside the vehicle and return the vehicle height to NORMAL.
    6. After vehicle height control is completed, select vehicle height control mode and turn it off via the vehicle setting conditions on the multi-information display.
  3. MEASURE VEHICLE HEIGHT 
    NOTE:
    • Before inspecting the wheel alignment, adjust the vehicle height to the specified value.
    • Be sure to perform measurement on a level surface.
    • If it is necessary to go under the vehicle for measurement, confirm that the parking brake is applied and the vehicle is secured with chocks.
    • Inspect while the vehicle is unloaded.
    • The standard value shown here is a value that is used for performing a wheel alignment and does not indicate the height of an actual vehicle.
    1. Bounce the vehicle up and down at the corners to stabilize the suspension.
    2. Measure the vehicle height.
      GTY968459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Measurement Points: 

      1. A: Ground clearance of front wheel center
      1. B: Ground clearance of front suspension lower arm bolt center
      1. C: Ground clearance of rear wheel center
      1. D: Ground clearance of rear suspension arm attachment recess

      Vehicle Height (Unloaded Vehicle)

      Item Front A - B Rear C - D
      w/ Air suspension 152 mm (5.98 in.)*A
      150 mm (5.91 in.)*B      		 78 mm (3.07 in.)
      w/o Air suspension 139 mm (5.47 in.)*A
      137 mm (5.39 in.)*B      		 59 mm (2.32 in.)

      *A: w/ Adjust Cam*B: w/o Adjust Cam

  4. INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION 

    Caster (Unloaded Vehicle)

    Item Caster Inclination Right-left Difference
    w/ Air suspension 5°07' +/-45' (5.12° +/-0.75°) 0°45' (0.75°) or less
    w/o Air suspension 4°32' +/-45' (4.53° +/-0.75°) 0°45' (0.75°) or less

    Camber (Unloaded Vehicle)

    Item Camber Inclination Right-left Difference
    w/ Air suspension -0°45' +/-45' (-0.75° +/-0.75°) 0°30' (0.50°) or less
    w/o Air suspension -0°28' +/-45' (-0.47° +/-0.75°) 0°30' (0.50°) or less

    Steering Axis Inclination (Unloaded Vehicle)

    Item Steering Axis Inclination Reference
    w/ Air suspension 8°59' (8.98°)
    w/o Air suspension 8°45' (8.75°)
  5. ADJUST CAMBER AND CASTER (w/ Adjust cam) 
    1. Put matchmarks on the adjusting cam (front side) and adjusting cam (rear side).
      GTY821727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Loosen the nut of the adjusting cam (front side) and the bolt of the adjusting cam (rear side).
    3. Turn the adjusting cam, and adjust the camber and caster.
      GTY793338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Top View *b Front of Vehicle
      *c Upper Side *d Out Side
      *e Adjust Cam RH (Front Side) *f Adjust Cam LH (Front Side)
      *g Adjust Cam RH (Rear Side) *h Adjust Cam LH (Rear Side)
    4. Refer to the adjustment table to make adjusting easier.
    5. Refer to the following example on how to use the adjustment table.
      GTY834411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Caster -0°10' (-0.2°)
      *b Caster 0°00' (+/-0.00°)
      *c Camber -0°20' (-0.3°)
      *d Camber 0°00' (+/-0.00°)
      *e Adjustment value
      *f Standard value

      Standard value (reference)

      Camber Caster
      -0°45' (-0.75°) 5°07' (5.12°)

      Measured value (reference)

      Camber Caster
      -1°05' (-1.08°) 4°57' (4.95°)
      1. Calculate the adjustment value by using the formula below.

        Adjustment value (reference)

        - Camber Caster
        Adjustment Value -0°20' (-0.3°) -0°10' (-0.2°)

        Formula:

        Adjustment Value = Measured Value - Standard Value

      2. Mark the adjustment value point on the adjustment table. Then obtain the adjusting cam turning distance from the adjustment table so that the adjustment value point becomes zero.

        Amount to turn adjusting cams (by gradation)

        - Adjusting Cam Turning Distance
        Adjusting Cam
        (Front Side)        		 Approximately 2.5 notches in minus direction
        Adjusting Cam
        (Rear Side)        		 Approximately 1.0 marking in minus direction
    6. Adjustment Table
      GTY832915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Camber 0°30' (0.50°) *b Caster 1°00' (1.00°)
      *c Camber +/- 0°00' (0.00°) *d Caster 0°30' (0.50°)
      *e Camber -0°30' (-0.50°) *f Caster +/- 0°00' (0.00°)
      *g Caster -0°30' (-0.50°) *h Caster -1°00' (-1.00°)
      *i Adjust Cam (Rear Side) *j Adjust Cam (Front Side)
    7. Tighten the nut of the adjusting cam (front side) and the bolt of the adjusting cam (rear side).

      Adjust Cam (Front Side) 

      Torque: 190 N.m (1937 kgf/cm, 140 ft.lbf) 

      Adjust Cam (Rear Side) 

      Torque: 190 N.m (1937 kgf/cm, 140 ft.lbf) 

  6. INSPECT TOE-IN 
    1. Bounce the vehicle up and down at the corners to stabilize the suspension.
    2. Release the parking brake and move the shift lever to N.
    3. Push the vehicle straight ahead approximately 5 m (16.4 ft.). (Step C)
    4. Put tread center marks on the rearmost points of the front wheels and measure the distance between the marks (dimension B).
      GTY425631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Tread Center Mark
      *b Dimension B
      Front of the Vehicle
    5. Slowly push the vehicle straight ahead to cause the front wheels to rotate 180°. Use the front tire valve as a reference point.

      HINT: 

      Do not allow the wheels to rotate more than 180°. If the wheels rotate more than 180°, perform the procedure from step C again.

    6. Measure the distance between the tread center marks on the front of the wheels (dimension A).
      GTY427700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Dimension A
      Front of the Vehicle

      Toe-in (Unloaded Vehicle)

      Specified Condition
      C + D: 0° +/- 0°09' (0° +/-0.15°)
      B - A: 0 +/- 2 mm (0 +/- 0.079 in.)

      HINT: 

      Measure "B - A" only when "C + D" cannot be measured.

      If the toe-in is not within the specified range, adjust it at the steering rack ends.

  7. ADJUST TOE-IN 
    1. Make sure that the thread length of the right and left steering rack ends are approximately the same.

      Standard Difference

      1.5 mm (0.059 in.) or less

      GTY828533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Steering Rack Boot Clip
      *2 Lock Nut
    2. Remove the steering rack boot clips.
    3. Loosen the tie rod assembly lock nuts.
    4. Turn the right and left steering rack ends by an equal amount to adjust the toe-in.
    5. Make sure that the thread length of the right and left steering rack ends are the same.
    6. Using SST, tighten the tie rod assembly lock nuts.
      • SST: 09612-24014 
        1. 09617-24011

      Specified tightening torque 

      Torque: 88 N.m (897 kgf/cm, 65 ft.lbf) 

      HINT: 

      • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

        Refer to PRECAUTION [10/2017 - 09/2019] , or refer to PRECAUTION [09/2019 - 10/2020]

      • When using SST (fulcrum length of 51 mm (2.008 in.)) + torque wrench (fulcrum length of 600 mm (23.622 in.)): 81.1 N.m (827 kgf/cm, 60 ft.lbf)
      GTY1237874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Torque Wrench Fulcrum Length
    7. Place the steering rack boots on the seats and install the steering rack boot clips.

      HINT: 

      • Make sure that the steering rack boots are not twisted.
      • Make sure that the steering rack boot clips are facing towards the front of the vehicle.
  8. INSPECT WHEEL ANGLE 
    1. Put tread center marks on the rearmost points of a turning radius gauge.
      GTY425420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Inside
      *b Outside
      Front of the Vehicle
    2. Turn the steering wheel fully to the left and right and measure the turning angle.

      Wheel Turning Angle (Unloaded Vehicle)

      Item Inside Wheel Outside Wheel
      w/ Air suspension 37°02' (35°02' to 39°02')
      (37.03° (35.03° to 39.03°))      		 32°36' (32.60°)
      w/o Air suspension 37°08' (35°08' to 39°08')
      (37.13° (35.13° to 39.13°))      		 32°51' (32.85°)
  9. INSPECT FRONT SUSPENSION 
    1. Inspect the front frame crossmember sub-assembly.

      Standard

      820.8 mm (32.31 in.)

      GTY823945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the front lower suspension arm assembly.

      Standard

      310.5 mm (12.22 in.)

      GTY968386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 26 mm (1.02 in.)
    3. Inspect the lower No. 2 suspension arm assembly.

      Standard

      408.7 mm (16.09 in.)

      GTY823944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the front upper No. 1 suspension arm assembly.

      Standard

      221.3 mm (8.71 in.)

      GTY823940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Inspect the front upper No. 2 suspension arm assembly.

      Standard

      218.4 mm (8.60 in.)

      GTY823939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. CHECK VEHICLE HEIGHT CONTROL (w/ Air Suspension) 
    1. Check the vehicle height control operation.

      Refer to OPERATION CHECK [10/2017 - ]

    2. After the inspection is completed, return the settings to the recorded values.
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