Suspension: Adjustments Lexus LS IV

ADJUSTMENT

Note. When the wheel alignment is performed, or a suspension related part is removed and installed/replaced, make sure to the cable from the negative (-) battery terminal for 2 seconds or more after finishing, and then reconnect the cable and perform initialization. If the vehicle is equipped with a VSC system, when the wheel alignment is performed, or a suspension related part is removed and installed/replaced, always perform the following initialization so that the system can function normally: (1) Disconnect the cable from the negative (-) battery terminal for 2 seconds or more and then reconnect it; then (2) perform the yaw rate sensor zero point calibration and test mode inspection. If the vehicle has an object recognition camera, after the wheel alignment is performed, always adjust the object recognition camera.

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1. ADJUST FRONT SUSPENSION MEMBER Before removing the front suspension member, place matchmarks on the front suspension member and vehicle body with marking spray. HINT: Spray from the rear of the vehicle. When installing the front suspension member, align the matchmarks on the front suspension member and vehicle body, and then install the front suspension member.
2. INSPECT TIRES (See «INSPECTION» )
3. MEASURE VEHICLE HEIGHT Bounce the vehicle at the corners up and down to stabilize the suspension and inspect the vehicle height. Standard vehicle height STANDARD VEHICLE HEIGHT Front (A - B) Rear (C - D) 146 mm (5.75 in.) 83 mm (3.27 in.) Measuring points: A: Ground clearance of front wheel center B: Ground clearance of head center of bolt used to install the front No. 1 suspension lower arm to the front suspension member C: Ground clearance of rear wheel center D: Ground clearance of pit center of the attachment rear suspension arm NOTE: Before inspecting the wheel alignment, adjust the vehicle height to the specified value. If the vehicle height is not as specified, adjust the height by pressing down on the vehicle several times to stabilize the suspension.
4. INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION Put the front wheels on the center of the alignment tester. Remove the center ornament. Install the camber-caster-steering axis inclination gauge at the center of the axle hub or drive shaft. Inspect the camber, caster and steering axis inclination. Standard camber inclination (unloaded) STANDARD CAMBER Camber Inclination Camber Left - right error -0°40' +/-45' (-0.67° +/-O.750) 30' (0.50°) or less Standard caster inclination (unloaded) STANDARD CASTER Caster Inclination Caster Left - right error 4°58' +/-45' (4.97° +/-0.75°) 45' (0.75°) or less Standard steering axis inclination (unloaded) STANDARD STEERING AXIS Steering Axis Inclination Steering axis Left - right error 9°41'+/-45'(9.68° +/-0.75°) 30' (0.50°) or less NOTE: Inspect while the vehicle is empty. The maximum tolerance of right and left difference for the camber is 30' or less. The maximum tolerance of right and left difference for the caster is 45' or less. Remove the camber-caster-steering axis inclination gauge and attachment. Install the center ornament. If the caster and steering axis inclinations are not within the specified values, after the camber has been correctly adjusted, recheck the suspension parts for damaged and/or worn out parts.
5. ADJUST CAMBER AND CASTER Put matchmarks on the adjusting cam (front side) and adjusting cam (rear side). Loosen the nut of the adjusting cam (front side) and the bolt of the adjusting cam (rear side). Turn the adjusting cam, and adjust the camber and caster. Refer to the adjustment table to make adjusting easier. Refer to the following example on how to use the adjustment table. Standard value (reference) CAMBER AND CASTER REFERENCE Camber Caster -0°40' (-0.67°) 4°58' (4.97°) Measured value (reference) CAMBER AND CASTER REFERENCE Camber Caster -1° 4°48' (4.8°) Calculate the adjustment value by using the formula below. Adjustment value (reference) CAMBER AND CASTER REFERENCE - Camber Caster Adjustment Value -0°20' (-0.3°) -0°10' (-0.2°) Formula: Adjustment Value = Measured Value - Standard Value 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 DISTANCE - 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 Adjustment Table Tighten the nut of the adjusting cam (front side) and the bolt of the adjusting cam (rear side). Torque: 210 N*m (2141 kgf*cm, 155 ft.*lbf) Inspect the toe-in. Inspect side slip.
6. ADJUST CAMBER If the right and left camber values are not within the specified value even though the camber and caster have been adjusted with the toe adjusting cam and camber adjusting cam, replace the inner No. 1 and No. 2 arm attachment plates and perform the camber adjustment. Standard STANDARD - Inner No. 1 Arm Attachment Plate Inner No. 2 Arm Attachment Plate Camber Angle Change Caster Angle Change - RH LH RH LH - - Arm Attachment Part No. and Distinguishing Color Standard Part 48614-50010 (Yellow) 48617-50010 (Yellow) 48614-50020 (White) 48617-50020 (White) 0 (Standard) 0 (Standard) + 2 mm Part 48614-50030 (Pink) 48617-50030 (Pink) 48614-50050 (Blue) 48617-50050 (Blue) + 12.0' + 1' HINT: For +2 mm parts, the upper arm installation hole is further toward the outside of the vehicle compared to standard parts.
7. INSPECT TOE-IN Bounce the vehicle up and down at the corners to stabilize the suspension and inspect toe-in. Toe-in TOE-IN REFERENCE Item Standard toe-in Toe-in (total) B - A: 0 +/-2 mm (0 +/-0.0787 in.) If toe-in is not within the specified range, adjust it at the rack ends.
8. ADJUST TOE-IN Measure the thread lengths of the right and left rack ends. Standard: Difference in thread length of 1.5 mm (0.0591 in.) or less Remove the rack boot set clips. Loosen the tie rod end lock nuts. Adjust the rack ends if the difference in thread length between the right and left rack ends is not within the specified range. Extend the shorter rack end if the measured toe-in deviates toward the outer-side. Shorten the longer rack end if the measured toe-in deviates toward the inner-side. 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. Make sure that the lengths of the right and left rack ends are the same. Tighten the tie rod end lock nuts. Torque: 56 N*m (571 kgf*cm, 41 ft.*lbf) NOTE: Partially 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. Perform the VGRS system calibration (See «INITIALIZATION» ). Place the boots on the seats and install the clips. HINT: Make sure that the boots are not twisted. Make sure that the clips' finger grips are positioned as shown in the illustration.
9. INSPECT WHEEL ANGLE Turn the steering wheel fully to the left and right and measure the turning angle. Standard wheel turning angle WHEEL TURNING ANGLE Inside wheel Outside wheel: Reference 38°02' +/-2° (38.03°+/-2°) 33°39' (33.65°) If the right and left inside wheel angles differ from the specified range, check the right and left rack end lengths.
10. INSPECT FRONT SUSPENSION Inspect the front suspension member. Measure the length between the installation bolts of the front No. 1 suspension lower arm and front No. 2 suspension lower arm. Standard length: 846.8 mm (33.3 in.) (A) 856 mm (33.7 in.) (B) If the result is not within the specification, replace the front suspension member. Inspect the front No. 1 suspension lower arm. Remove the front No. 1 suspension lower arm (See «REMOVAL» ). Measure the dimension between the center of the front No. 1 suspension lower arm bush and position A. Standard length: 286.1 mm (11.3 in.) HINT: If the dimension of the front suspension lower arm changes 2 mm (0.0787 in.), the camber will change approximately 16' (0.3°). Inspect the front No. 2 suspension lower arm. Remove the front No. 2 suspension lower arm (See «REMOVAL» ). Measure the dimension between the center of the front suspension lower arm bush and the ball joint stud. Standard length: 399.5 mm (15.7 in.) HINT: If the dimension of the front suspension lower arm changes 2 mm (0.0787 in.), the camber will change approximately 1' (0.02°). Inspect the front No. 1 suspension upper arm. Remove the front No. 1 suspension upper arm (See «REMOVAL» ). Measure the dimension between the center of the front No. 1 suspension upper arm bush and the ball joint stud. Standard length: 235.8 mm (9.28 in.) HINT: If the dimension of the front suspension upper arm changes 2 mm (0.0787 in.), the camber will change approximately 7' (0.12°). Inspect the front No. 2 suspension upper arm. Remove the front No. 2 suspension upper arm (See «REMOVAL» ). Measure the dimension between the center of the front No. 2 suspension upper arm bush and the ball joint stud. Standard length: 233 mm (9.17 in.) HINT: If the dimension of the front suspension upper arm changes 2 mm (0.0787 in.), the camber will change approximately 6' (0.1°).
11. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
12. REMOVE COWL TOP VENTILATOR LOUVER RH (See «REMOVAL» )
13. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. Disconnect the cable from the negative battery terminal for 2 seconds or more.
14. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
15. INSTALL COWL TOP VENTILATOR LOUVER RH (See «INSTALLATION» )
16. PERFORM YAW RATE AND DECELERATION SENSOR ZERO POINT CALIBRATION Perform the yaw rate and deceleration sensor zero point calibration (See «CALIBRATION»(/lexus/ls/iv-2006-2012/remont/anti-locktraction-control/#brake-control) ).
17. INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT Initialize the rotation angle sensor and calibrate torque sensor zero point (See «CALIBRATION» ).
18. PERFORM INITIALIZATION Perform the initialization (See «INITIALIZATION» ).

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1. INSPECT TIRE Inspect the tires (see «INSPECTION» ).
2. MEASURE VEHICLE HEIGHT Measure the vehicle height for coil suspension (see «ADJUSTMENT» ). Measure the vehicle height for air suspension (see «ADJUSTMENT» ).
3. INSPECT TOE-IN Standard toe-in: B - A 3 +1-2 mm (0.12 +/-0.08 in.) If the toe-in is not within the specified range, inspect the suspension parts and replace if necessary.
4. ADJUST TOE-IN Loosen the toe adjust cam nut. Turn the adjust cams by an equal amount to adjust toe-in. HINT: Try to adjust the toe-in to the center value. The toe-in will change by the following specification corresponding to each graduation of the cam: Approximately: 4.8 mm (0.188 in.) Tighten the nut. Torque: 60 N*m (612 kgf*cm, 44 ft.*lbf)
5. INSPECT CAMBER Install a camber-caster-kingpin gauge or put the wheels on a wheel alignment tester. Inspect the camber. Standard camber inclination (unloaded vehicle) STANDARD CAMBER Item Camber Inclination w/o Air Suspension Camber Left-right error -1°38'+/-45'(-1.63°+/-0.75°) 30' (0.50°) or less w/ Air Suspension Camber Left-right error -1°50' +/-45' (-1.83° +/-0.75°) 30' (0.50°) or less If the measured value is not within the specified range, inspect the suspension parts for damage and wear. Replace parts as necessary because camber cannot be properly adjusted with any damaged or worn parts.
6. INSPECT REAR SUSPENSION Inspect the rear suspension member. Measure the distance between the centers of the installation bolts of the rear No. 2 suspension arm assembly LH and RH. Standard length STANDARD LENGTH Length A Length B 635.0 mm (25.000 in.) 588.0 mm (23.150 in.) HINT: If the distance is not within the specified range, replace the rear suspension member. Visually inspect the press holes on the installation area of the rear upper No. 2 control arm assembly. Standard length: The holes are not deformed. HINT: If the holes are deformed, replace the rear suspension member. Inspect the rear No. 1 suspension arm. Measure the distance between the centers of the 2 installation bolts of the rear No. 1 suspension arm. Standard length: 361.3 to 362.1 mm (14.224 to 14.256 in.) HINT: If the distance is not within the specified range, replace the rear No. 1 suspension arm. Inspect the rear No. 2 suspension arm. Measure the distance between the centers of the 2 installation bolts of the rear No. 2 suspension arm. Standard length: 426.8 to 427.6 mm (16.803 to 16.835 in.) HINT: If the distance is not within the specified range, replace the rear No. 2 suspension arm. Inspect the rear upper No. 1 control arm. Measure the distance between the centers of the installation bolt of the rear upper No. 1 control arm and the ball joint stud. Standard length: 208.5 to 209.3 mm (8.209 to 8.240 in.) HINT: If the distance is not within the specified range, replace the rear upper No. 1 control arm. Inspect the rear upper No. 2 control arm. Measure the distance between the centers of the installation bolt of the rear upper No. 2 control arm and the ball joint stud. Standard length: 329.2 to 330.0 mm (12.961 to 12.992 in.) HINT: If the distance is not within the specified range, replace the rear upper No. 2 control arm. Inspect the toe control link. Measure the distance between the centers of the installation bolt of the toe control link and the ball joint stud. Standard length: 472.6 to 473.6 mm (18.606 to 18.646 in.) HINT: If the distance is not within the specified range, replace the toe control link. Inspect and adjust toe-in and camber. Inspect toe-in and camber. If the values are not within the specified range, adjust the installation bolt holding the rear suspension member to the vehicle body, or the bolt holding the upper control arm and rear suspension arm so that the values fall within the specified range.
7. REPLACE REAR SUSPENSION ARM ATTACHMENT SUB-ASSEMBLY When rear suspension member is not replaced: Use the same stamping No. as the parts that were removed from the left and right side of the vehicle. When rear suspension member is replaced: Use stamping No. 1 for the parts that were removed from the left and right side of the vehicle. Part No. information PART INFORMATION Stamping No. Part No. (Rear suspension attachment) Part No. (Toe adjust plate) Dimension A 1 48709-50040 48452-50010 23 mm (0.906 in.) 2 48709-50050 48452-50020 21 mm (0.827 in.) 3 48709-50060 48452-50030 25 mm (0.985 in.)

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See also:
• CALIBRATION
• REMOVAL
• COOLANT
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• INSTALLATION