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Home >> Lexus >> 2017 >> GS 450h Base >> Repair and Diagnosis >> Suspension >> Wheel Alignment >> Wheel Alignment (Service Information) >> Front Wheel Alignment >> Adjustment [09/2014 - 10/2015] >> Procedure
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Adjustment [09/2014 - 10/2015]: Procedure

  1. INSPECT TIRES 

    HINT: 

    Inspect the tires (See article. Refer to INSPECTION [09/2014 - 10/2015] ).

  2. MEASURE VEHICLE HEIGHT 
    1. Bounce the vehicle at the corners up and down to stabilize the suspension and inspect vehicle height.
      GTY418551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Vehicle height (Unloaded vehicle)

      Front (A-B) Rear (C-D)
      114 mm
      (4.49 in.)
      97 mm
      (3.82 in.)

      Measuring points

      Ground clearance of front wheel center

      Ground clearance of front center position of front suspension lower arm assembly front bush installation

      Ground clearance of rear wheel center

      Ground clearance of rear center position of rear suspension No. 2 arm bush installation bolt screw thread

      NOTE:
      • The standard value shown here is a value that is used for adjusting the wheel alignment and does not indicate the height of an actual vehicle.
      • Before inspecting the wheel alignment, adjust the vehicle height to the specified value.

      HINT: 

      Bounce the vehicle at the corners up and down to stabilize the suspension and inspect the vehicle height.

  3. INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION 
    1. Put the front wheel on the center of the alignment tester.
      TEXT IN ILLUSTRATION

      *1 Wheel Alignment Tester
      *2 Gauge
      GTY227412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the center ornament.
    3. Install the camber-caster-steering axis inclination gauge at the center of the axle hub or drive shaft.
    4. Inspect the camber, caster and steering axis inclination.

      Camber, caster and steering axis inclination (Unloaded vehicle)

      Camber -0°14' +/-45'
      (-0.23° +/-0.75°)
      Right-left Error
      45' (0.75°) or less
      Caster 7°55' +/-45'
      (7.92° +/-0.75°)
      Right-left Error
      45' (0.75°) or less
      Steering axis inclination 10°28' +/-45'
      (10.47° +/-0.75°)
      Right-left Error
      45' (0.75°) or less
      NOTE:
      • Inspect while the vehicle is empty.
      • The maximum tolerance of right and left difference for the camber and caster is 45' (0.75°) or less.
    5. Remove the camber-caster-steering axis inclination gauge and attachment.
    6. Install the center ornament.

      If the caster and steering axis inclination are not within the specified values, after the camber has been correctly adjusted, recheck the suspension parts for damaged and/or worn out parts.

  4. INSPECT FRONT SUSPENSION 
    1. Inspect the front suspension member.
      GTY395906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the dimension between the center of the installation bolts of the front suspension lower arm.

        Standard

        692.5 to 699.5 mm (2.28 to 2.29 ft.)

        If the result is not within the specification, replace the front suspension member.

    2. Inspect the front suspension lower arm assembly.
      GTY401220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the front suspension lower arm assembly, see the REPLACEMENT (See article. Refer to REMOVAL [09/2014 - 10/2015] ).
      2. Measure the dimension between the center of the front suspension lower arm assembly bush and position A.

        Standard

        396 mm (1.30 ft.)

        HINT: 

        If the dimension of the front suspension lower arm assembly changes 2 mm (0.079 in.), the camber will change approximately 15' (0.25°).

    3. Inspect the front suspension upper arm assembly.
      GTY531855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the front suspension upper arm assembly, see the REPLACEMENT (See article. Refer to REMOVAL [09/2014 - ] ).
      2. Measure the dimension between the center of the front suspension upper arm assembly bush and the ball joint stud.

        Standard

        250 mm (9.84 in.)

        231 mm (9.09 in.)

        HINT: 

        If the dimension of the front suspension upper arm assembly changes 2 mm (0.079 in.), the camber will change approximately 15' (0.25°).

  5. ADJUST CASTER 
    1. Based on the caster inspection values, select a lower No. 2 arm bracket.
      GTY531761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Part No. Information

      Part No. Offset (position) Part Name
      48075-30060 0' Lower Arm Bush Bracket Sub-assembly RH
      48075-30080 +20' Lower Arm Bush Bracket Sub-assembly RH
      48075-30090 -20' Lower Arm Bush Bracket Sub-assembly RH
      48076-30060 0' Lower Arm Bush Bracket Sub-assembly LH
      48076-30080 +20' Lower Arm Bush Bracket Sub-assembly LH
      48076-30090 -20' Lower Arm Bush Bracket Sub-assembly LH
  6. INSPECT TOE-IN 
    1. Bounce the vehicle at the corners up and down to stabilize the suspension and inspect toe-in.
      TEXT IN ILLUSTRATION

      Front of Vehicle
      GTY524752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Toe-in (Unloaded Vehicle)

      Toe-in A: 0°2.6' +/-5' (0.04° +/-0.09°)
      B - C: 1 +/-2 mm (0.04 +/-0.08 in.)

      HINT: 

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

  7. ADJUST TOE-IN 
    1. Measure the thread lengths of the right and left rack ends.

      Standard

      Difference in thread length of 1.5 mm (0.059 in.) or less

    2. Remove the rack boot set clips.
    3. Loosen the tie rod end lock nuts.
    4. Adjust the rack ends if the difference in thread length between the right and left rack ends is not within the specified range.
      1. Extend the shorter rack end if the measured toe-in deviates toward the inner-side.
      2. Shorten the longer rack end if the measured toe-in deviates toward the outer-side.
    5. Turn the right and left rack ends by an equal amount to adjust toe-in.

      HINT: 

      Try to adjust toe-in to the center of the specified range.

    6. Make sure that the lengths of the right and left rack ends are the same.
      GTY409053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Tighten the tie rod end lock nuts.

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

      NOTE:

      Temporarily tighten the lock nut while holding the hexagonal part of the steering rack end so that the lock nut and the steering rack end do not turn together. Hold the width across flat of the tie rod end and tighten the lock nut.

    8. Place the boots on the seats and install the clips.
      NOTE:

      Make sure that the clips are facing towards the front of the vehicle.

      HINT: 

      Make sure that the boots are not twisted.

  8. INSPECT WHEEL ANGLE 
    1. Turn the steering wheel fully left and right and measure the turning angle.
      TEXT IN ILLUSTRATION

      *a Inside
      *b Outside
      Front of the vehicle
      GTY389139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Wheel turning angle

      Inside wheel Outside wheel: Reference
      36°01' +/-2°
      (36.02° +/-2°)
      41°35'
      (41.58°)

      If the right and left inside wheel angles differ from the specified range, check the right and left rack end lengths.

  9. PLACE FRONT WHEELS FACING STRAIGHT AHEAD 
  10. REMOVE LUGGAGE COMPARTMENT FLOOR MAT 

    Refer to PROCEDURE - Step 1

  11. REMOVE LUGGAGE COMPARTMENT TRIM COVER LH 

    Refer to PROCEDURE - Step 2

  12. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL 
    NOTE:

    Disconnect the cable from the negative battery terminal for more than 2 seconds.

  13. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL 
    NOTE:

    When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See article. Refer to INITIALIZATION [09/2014 - 10/2015] ).

  14. INSTALL LUGGAGE COMPARTMENT TRIM COVER LH 

    Refer to PROCEDURE - Step 24

  15. INSTALL LUGGAGE COMPARTMENT FLOOR MAT 

    Refer to PROCEDURE - Step 26

  16. PERFORM YAW RATE SENSOR ZERO POINT CALIBRATION 

    (See article. Refer to CALIBRATION [09/2014 - ] )

  17. CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION 

    (See article. Refer to CALIBRATION [09/2014 - ] )