Front Wheel Alignment: Adjustment: Adjustment

WARNING: This page is about a different car, the 2009 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If the wheel alignment has been adjusted, or if suspension or underbody components have been removed/installed or replaced, be sure to perform the following initialization procedure in order for the system to function normally.

Disconnect the cable from the negative battery terminal for more than 2 seconds.
Reconnect the cable to the negative battery terminal.
Perform zero point calibration of the yaw rate and acceleration sensor and test mode inspection.

HINT:

Refer to CALIBRATION

INSPECT FRONT SUSPENSION
1. Inspect the front suspension member.
  
  Fig 1: Measuring Dimension Between Center Of Installation Bolts Of Front Lower Suspension Arm
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Measure the dimension between the center of the installation bolts of the front lower suspension arm.
    Standard
    
    692.5 to 699.5 mm (2.27 to 2.30 ft.)
    
    If the result is not within the specification, replace the front suspension member.
2. Inspect the front lower suspension arm assembly.
  
  Fig 2: Inspecting Front Lower Suspension Arm Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Remove the front lower suspension arm assembly. Refer to REMOVAL .
  2. Measure the dimension between the center of the front lower suspension arm assembly bush and the center of position A.
    Standard
    
    362 to 364.6 mm (1.19 to 1.20 ft.)
    
    If the dimension of the front lower suspension arm assembly changes 2 mm (0.079 in.), the camber will change approximately 15' (0.25°).
3. Inspect the front upper suspension arm assembly.
  
  Fig 3: Inspecting Front Upper Suspension Arm Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Remove the front upper suspension arm assembly. Refer to REMOVAL .
  2. Measure the dimension between the center of the front upper suspension arm assembly bush and the center of the ball joint stud.
    Standard
    
    A
    
    241 to 242.6 mm (9.49 to 9.55 in.)
    
    B
    
    215.1 to 216.7 mm (8.47 to 8.53 in.)
    
    If the dimension of the front upper suspension arm assembly changes 2 mm (0.0787 in.), the camber will change approximately 15' (0.25°).
INSPECT TIRES
Refer to INSPECTION

MEASURE VEHICLE HEIGHT

Bounce the vehicle at the corners up and down to stabilize the suspension and inspect the 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 required to go under the vehicle for measurement, confirm that the parking brake is applied and the vehicle is secured with chocks.

Fig 4: Measuring Vehicle Height

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Vehicle Height

Front A-B	Rear C-D
131.7 mm (5.19 in.)	112.1 mm (4.41 in.)

Measuring points

Ground clearance of front wheel center.

Ground clearance of front center position of front suspension lower arm assembly front bushing installation bolt head.

Ground clearance of rear center position of rear No. 2 suspension arm bushing installation bolt threads.

Ground clearance of rear center position of rear suspension lower arm assembly rear bushing installation bolt head.

INSPECT WHEEL ANGLE

Put tread center marks on the rearmost points of the turning radius gauge.

Turn the steering wheel fully left and right and measure the turning angle.

Fig 5: Inspecting Wheel Angle

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Wheel Turning Angle

Inside Wheel	Outside Wheel (Reference)
41°48' +/- 2° (41.8° +/- 2°)	35°48' (35.8°)

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

INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION

Place a front wheel on the center of the turning radius gauge.

Fig 6: Inspecting Camber, Caster, & Steering Axis Inclination
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Remove the center ornament.
Install the camber-caster-kingpin gauge at the center of the axle hub or drive shaft.

Inspect the camber, caster, and steering axis inclination.

Camber, Caster, and Steering Axis Inclination

Camber Angle	Caster Angle	Steering Axis Inclination Angle
-0°52' +/- 45' (-0.87° +/- 0.75°)	8°42' +/- 45' (8.70° +/- 0.75°)	11°11' +/- 45' (11.18° +/- 0.75°)

NOTE:

Inspect while the vehicle is unloaded.
The maximum tolerance of right and left difference for the camber and caster is 30' (0.5°) or less.

Remove the camber-caster-kingpin gauge.
Install the center ornament.
If the caster and steering axis inclination are not within the specified range after the camber has been correctly adjusted, recheck the suspension parts for damaged and/or worn out parts.

ADJUST CASTER

According to the cater measurement, select a lower No. 2 arm bracket.

LOWER NO. 2 ARM BRACKET SELECTION

Bracket Part No.	Installation Position	Offset Angle
48075-30020	RH	0(Standard)
48075-53020	RH	+20'
48075-53030	RH	-20'
48076-30020	LH	0(Standard)
48076-53020	LH	+20'
48076-53030	LH	-20'

INSPECT TOE-IN

Bounce the vehicle up and down at the corners to stabilize the suspension.
Release the parking brake and move the shift lever to N.
Push the vehicle straight ahead approximately 5 m (16.4 ft.) *1.
Put tread center marks on the rearmost points of the front wheels and measure the distance between the marks (dimension B).

Fig 7: Measuring Distance Between Tread Center Marks (Dimension B)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Slowly push the vehicle straight ahead to cause the front wheels to rotate 180° using a front tire pressure 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 *1 again.

Measure the distance between the tread center marks on the front side of the wheels (dimension A).

Fig 8: Measuring Distance Between Tread Center Marks On Front Side Of Wheels (Dimension A)

Toe-in

Toe-in (Total)
B - A: 0.18 +/- 2 mm (0.00709 +/- 0.0787 in.)

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

ADJUST TOE-IN
1. Measure the thread lengths of the right and left rack ends.
  
  Fig 9: Measuring Thread Lengths Of Right And Left Rack Ends
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Difference in thread length is 1.5 mm (0.0591 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 outer-side.
  2. Shorten the longer rack end if the measured toe-in deviates toward the inner-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.
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 notches on the tie rod end and tighten the lock nut.
8. Place the boots on the seats and install the rack boot set clips.
  HINT:
  
  Make sure that the boots are not twisted.
PLACE FRONT WHEELS FACING STRAIGHT AHEAD
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
NOTE:
Disconnect the cable from the negative battery terminal for more than 2 seconds.
CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
PERFORM YAW RATE SENSOR ZERO POINT CALIBRATION
HINT:

Perform yaw rate sensor zero point calibration. Refer to CALIBRATION .
CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION
HINT:

Check steering angle sensor zero point calibration. Refer to PROCEDURE - Step 2 .