Toyota Avalon (XX50): Front Shock Absorber

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Suspension / Front Suspension / Front Shock Absorber

Components

COMPONENTS

ILLUSTRATION

*A	w/o AVS	-	-
*1	FRONT SHOCK ABSORBER WITH COIL SPRING	*2	FRONT SPEED SENSOR
*3	FRONT STABILIZER LINK ASSEMBLY	*4	FRONT FLEXIBLE HOSE
*5	STEERING KNUCKLE	-	-
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping": Nm (kgfcm, ft.*lbf)	-	-

ILLUSTRATION

*A	w/ AVS	-	-
*1	FRONT SHOCK ABSORBER WITH COIL SPRING	*2	FRONT SPEED SENSOR
*3	FRONT STABILIZER LINK ASSEMBLY	*4	FRONT FLEXIBLE HOSE
*5	STEERING KNUCKLE	*6	FRONT SPEED SENSOR WIRE
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping" : Nm (kgfcm, ft.*lbf)		Nm (kgfcm, ft.*lbf): Specified torque

ILLUSTRATION

*A	w/o AVS	*B	w/ Suspension Tower Damper
*1	FRONT COIL SPRING	*2	FRONT LOWER COIL SPRING INSULATOR
*3	FRONT NO. 1 SHOCK ABSORBER DUST COVER	*4	FRONT SHOCK ABSORBER ASSEMBLY
*5	FRONT SPRING BUMPER	*6	FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT
*7	FRONT SUSPENSION SUPPORT SUB-ASSEMBLY	*8	FRONT UPPER COIL SPRING INSULATOR
*9	STRUT MOUNTING BEARING	*10	SUSPENSION TOWER DAMPER
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping" : Nm (kgfcm, ft.*lbf)		Nm (kgfcm, ft.*lbf): Specified torque
●	Non-reusable part	-	-

ILLUSTRATION

*A	w/ AVS	-	-
*1	FRONT COIL SPRING	*2	FRONT LOWER COIL SPRING INSULATOR
*3	FRONT NO. 1 SHOCK ABSORBER DUST COVER	*4	FRONT SHOCK ABSORBER ASSEMBLY
*5	FRONT SPRING BUMPER	*6	FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT
*7	FRONT SUSPENSION SUPPORT SUB-ASSEMBLY	*8	FRONT UPPER COIL SPRING INSULATOR
*9	STRUT MOUNTING BEARING	-	-
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping": Nm (kgfcm, ft.*lbf)	●	Non-reusable part

Disposal

DISPOSAL

PROCEDURE

1. DISPOSE OF FRONT SHOCK ABSORBER ASSEMBLY

CAUTION:

Always use a cloth to prevent shards of metal flying about due to the release of pressurized gas.
Always wear safety glasses.

HINT:

The gas is colorless, odorless and non-poisonous.

(a) w/o AVS:

(1) Place the front shock absorber horizontally with the piston rod extended, and using a hacksaw, make a hole between (A) and (B), and between (C) and (D) shown in the illustration to discharge the gas inside.

(b) w/ AVS:

(1) Place the front shock absorber horizontally with the piston rod extended, and using a hacksaw, make a hole between (A) and (B) shown in the illustration to discharge the gas inside.

Inspection

INSPECTION

PROCEDURE

1. INSPECT FRONT SHOCK ABSORBER ASSEMBLY

(a) Compress and extend the front shock absorber assembly rod 4 times or more.

Standard:

When compressed and extended at a constant speed, the stroke of the shock absorber rod is smooth with no abnormal resistance or sounds. When extended, the shock absorber rod returns to its original position at a constant speed with no abnormal sounds.

HINT:

If there are any abnormalities, replace the front shock absorber assembly with a new one.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

HINT:

Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.

PROCEDURE

1. INSTALL SUSPENSION TOWER DAMPER (w/ Suspension Tower Damper)

(a) Install the suspension tower damper to the front shock absorber assembly with the bolt.

Torque:

20 N·m {204 kgf·cm, 15 ft·lbf}

2. INSTALL FRONT LOWER COIL SPRING INSULATOR

(a) Install the front lower coil spring insulator to the front shock absorber assembly.

Positioning Pin

NOTICE:

When installing the front lower coil spring insulator, insert the positioning pin of the spring seat into the hole of the front lower coil spring insulator.

3. INSTALL FRONT SPRING BUMPER

(a) Install the front spring bumper to the front shock absorber assembly.

NOTICE:

Face the smaller diameter end of the front spring bumper downward.
Do not apply lubricants to the front spring bumper.
Do not apply lubricants to the front shock absorber assembly cap or rod.
Do not clean the front spring bumper with water or solvent.

4. INSTALL FRONT COIL SPRING

(a) Secure SST in a vise.

SST: 09727-00051

SST: 09727-30022

09727-00010

09727-00031

(b) Attach the hooks of each SST arm across the diameter of the coil spring.

CAUTION:

Make sure that the hooks are securely attached to the coil spring.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Make sure that the hooks of the upper and lower SST arms are attached to the coil spring so that the distance between the hooks is as large as possible.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Make sure that the arms of SST are parallel and the number of coils between the arms is the same on each side.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

CAUTION:

Make sure that the stopper pins are installed securely.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

(d) Using SST, compress the coil spring.

CAUTION:

If the coil spring starts to bow out while using SST, stop immediately and reattach SST correctly.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Do not compress the coil spring to the point where the coils touch each other.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Do not use an impact wrench.
If an impact wrench is used, the threads of SST may be damaged, or sudden compression of the coil spring may cause a hook to disengage and the coil spring to fly out, resulting in injury.
If a stopper pin touches the coil spring while using SST, remove the stopper pin and continue with the procedure.
If a stopper pin is removed, install a coil spring stopper belt as shown in the illustration.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

SST: 09727-00110

(e) Align the end of the front coil spring with the flange of the front lower coil spring insulator and install the front coil spring.

NOTICE:

Make sure to fit the end of the front coil spring that has the larger diameter into the depression of the front lower coil spring insulator.

*a	Depression

5. INSTALL STRUT MOUNTING BEARING

(a) Install the strut mounting bearing to the front No. 1 shock absorber dust cover.

NOTICE:

Make sure that the top end of the front No. 1 shock absorber dust cover and strut mounting bearing are securely attached.

*1	Strut Mounting Bearing
*a	Top End of the Front No. 1 Shock Absorber Dust Cover

6. INSTALL FRONT UPPER COIL SPRING INSULATOR

(a) Install the front upper coil spring insulator to the strut mounting bearing.

7. INSTALL STRUT MOUNTING BEARING WITH DUST COVER

(a) Install the strut mounting bearing with dust cover to the front shock absorber assembly.

8. INSTALL FRONT SUSPENSION SUPPORT SUB-ASSEMBLY

(a) Install the front suspension support sub-assembly as shown in the illustration.

*a	Slot
	Outside of the Vehicle

NOTICE:

Check that the slot on the piston rod and the slot on the front suspension support sub-assembly are aligned.

(b) Align the alignment mark of the front suspension support sub-assembly with the front shock absorber lower bracket as shown in the illustration.

*a	0° +/- 3°
*b	15°
*c	Alignment Mark of Front Suspension Support Sub-assembly
*d	Guide Line of Front Suspension Support Sub-assembly
*e	Alignment Mark of Strut Mounting Bearing
*f	Front Shock Absorber Lower Bracket
*g	Arrow of Shock Absorber Dust Cover
	Outside of the Vehicle

NOTICE:

Make sure to install the front suspension support sub-assembly so that the alignment mark of the front suspension support sub-assembly is aligned within +/- 3° of the center of the front shock absorber lower bracket.

(c) Align the alignment mark of the strut mounting bearing with the guide line of the front suspension support sub-assembly as shown in the illustration.

NOTICE:

Make sure to install the strut mounting bearing so that the alignment mark of the strut mounting bearing is aligned within +/- 15° of the guide line of the front suspension support sub-assembly.

(d) Align the arrow of the shock absorber dust cover with the alignment mark of the strut mounting bearing as shown in the illustration.

9. TEMPORARILY TIGHTEN FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT

(a) Temporarily tighten a new front support to front shock absorber nut.

(b) Remove SST from the front coil spring.

NOTICE:

Do not use an impact wrench. It will damage SST.

10. CONNECT FRONT NO. 1 SHOCK ABSORBER DUST COVER

(a) Connect the end of the front No. 1 shock absorber dust cover with the claws of the front shock absorber assembly.

NOTICE:

Make sure that the end of the front No. 1 shock absorber dust cover is securely attached to the claws of the front shock absorber assembly.
Make sure there is no excessive damage to the bellows of the front No. 1 shock absorber dust cover.
Do not allow oil, grease, etc., to contact the front No. 1 shock absorber dust cover.
If there is oil or grease on the insulator, wipe clean with a cloth. Do not use an alcohol based cleaner.

*1	Front No. 1 Shock Absorber Dust Cover
*a	Claw

11. INSTALL FRONT SHOCK ABSORBER WITH COIL SPRING

(a) Install the front shock absorber with coil spring (upper side) with the 3 nuts.

Torque:

50 N·m {510 kgf·cm, 37 ft·lbf}

(b) Install the front shock absorber with coil spring (lower side) to the steering knuckle with the 2 bolts and 2 nuts.

Torque:

290 N·m {2957 kgf·cm, 214 ft·lbf}

NOTICE:

When installing the nuts, keep the bolts from rotating.
Do not apply lubricants to the steering knuckle and shock absorber contact surfaces.

HINT:

The bolts can be installed in either direction, however, make sure that they are both installed in the same direction.

12. FULLY TIGHTEN FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT

(a) Fully tighten the front support to front shock absorber nut.

Torque:

47 N·m {479 kgf·cm, 35 ft·lbf}

NOTICE:

Perform this step only when the front shock absorber with coil spring has been disassembled.

13. INSTALL FRONT SPEED SENSOR (w/o AVS)

(a) Engage the 2 hooks to install the front speed sensor clamp bracket.

Hook

NOTICE:

Do not twist the front speed sensor when installing it.

(b) Install the front speed sensor and front flexible hose to the front shock absorber assembly with the bolt.

Torque:

29 N·m {296 kgf·cm, 21 ft·lbf}

NOTICE:

Do not twist the front flexible hose when installing it.

NOTICE:

Do not twist the front speed sensor when installing it.

14. INSTALL FRONT SPEED SENSOR (w/ AVS)

(a) Engage the 2 hooks to install the front speed sensor clamp bracket.

Hook

NOTICE:

Do not twist the front speed sensor when installing it.

(b) Install the front speed sensor wire and front flexible hose to the front shock absorber assembly with the 2 bolts.

Torque:

29 N·m {296 kgf·cm, 21 ft·lbf}

NOTICE:

Do not twist the front speed sensor wire or front flexible hose when installing them.

HINT:

Install the front speed sensor wire bracket first.

(d) Connect the front speed sensor wire connector to the sensor bracket.

15. INSTALL FRONT STABILIZER LINK ASSEMBLY

(a) Install the front stabilizer link assembly to the front shock absorber assembly with the nut.

Torque:

74 N·m {755 kgf·cm, 55 ft·lbf}

HINT:

If the ball joint turns together with the nut, use a 6 mm hexagon socket wrench to hold the stud bolt.

16. INSTALL COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY

Click here

17. INSTALL FRONT WHEEL

Click here

18. INSPECT AND ADJUST FRONT WHEEL ALIGNMENT

Click here

19. PERFORM INITIALIZATION

for HV Model:

Intelligent Clearance Sonar System
Intuitive Parking Assist System

Parking Assist Monitor System

for Initialization:

for Calibration:

Panoramic View Monitor System

for Initialization

for Calibration:

for Gasoline Model:

Intelligent Clearance Sonar System
Intuitive Parking Assist System

Click here

Parking Assist Monitor System

for Initialization:

for Calibration:

Panoramic View Monitor System

for Initialization:

for Calibration:

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during front shock absorber assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced (for HV Model:)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Front wheel alignment adjustment	Clear zero point calibration data. Perform yaw rate and acceleration sensor zero point calibration.	DTCs are stored ABS warning light illuminates Brake warning light / yellow (minor malfunction) illuminates Slip indicator light illuminates VSC disabled or malfunctions
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement.)	Measure ultrasonic sensor detection angle Ultrasonic sensor detection angle registration	Intelligent Clearance Sonar System Intuitive Parking Assist System
	Rear television camera assembly optical axis adjustment (Back camera position setting)	Parking Assist Monitor System	for Initialization: for Calibration:
	Parking assist ECU initialization Adjust steering angle Television camera assembly optical axis adjustment (Back camera position setting)	Panoramic View Monitor System	for Initialization: for Calibration:

Necessary Procedures After Parts Removed/Installed/Replaced (for Gasoline Model:)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Front wheel alignment adjustment	Perform system variant learning and acceleration sensor zero point calibration.	VSC disabled or malfunctioning DTCs are output Slip indicator light illuminated ABS warning light illuminated
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement.)	Measure ultrasonic sensor detection angle Ultrasonic sensor detection angle registration	Intelligent Clearance Sonar System Intuitive Parking Assist System
	Rear television camera assembly optical axis adjustment (Back camera position setting)	Parking Assist Monitor System	for Initialization: for Calibration:
	Parking assist ECU initialization Adjust steering angle Television camera assembly optical axis adjustment (Back camera position setting)	Panoramic View Monitor System	for Initialization: for Calibration:

HINT:

Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.

PROCEDURE

1. REMOVE FRONT WHEEL

Click here

2. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY

Click here

3. SEPARATE FRONT STABILIZER LINK ASSEMBLY

(a) Remove the nut and separate the front stabilizer link assembly from the front shock absorber assembly.

NOTICE:

Do not damage the boot of the ball joint.

HINT:

If the ball joint turns together with the nut, use a 6 mm hexagon socket wrench to hold the stud bolt.

4. SEPARATE FRONT SPEED SENSOR (w/o AVS)

(a) Remove the bolt, disengage the clamp and separate the front speed sensor and front flexible hose from the front shock absorber assembly.

NOTICE:

Be sure to separate the front speed sensor and front flexible hose from the front shock absorber assembly completely.

5. SEPARATE FRONT SPEED SENSOR (w/ AVS)

(a) Disconnect the front speed sensor wire connector from the sensor bracket.

(b) Disconnect the AVS connector from the absorber control actuator.

(c) Remove the 2 bolts and separate the front speed sensor wire and front flexible hose from the front shock absorber assembly.

NOTICE:

Be sure to separate the front speed sensor wire and front flexible hose from the front shock absorber assembly completely.

6. LOOSEN FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT

(a) Loosen the front support to front shock absorber nut.

CAUTION:

Only loosen the front support to front shock absorber nut if the front shock absorber with coil spring needs to be disassembled.
Only loosen the front support to front shock absorber nut, do not remove it.
If the front support to front shock absorber nut is removed with the front coil spring under tension, components of the front shock absorber with coil spring may fly off.

7. REMOVE FRONT SHOCK ABSORBER WITH COIL SPRING

(a) Support the front lower No. 1 suspension arm sub-assembly using a jack and wooden block.

*a	Wooden Block
*b	Jack
	Front of the Vehicle
	Wooden Block Placement Location

NOTICE:

Keep the front lower No. 1 suspension arm sub-assembly supported until installation of the front shock absorber with coil spring is complete.

(b) Remove the 2 bolts and 2 nuts, and separate the front shock absorber with coil spring (lower side) from the steering knuckle.

NOTICE:

When removing the nuts, keep the bolts from rotating.
Use wire or an equivalent tool to hang the separated steering knuckle.

8. REMOVE FRONT SUPPORT TO FRONT SHOCK ABSORBER NUT

(a) Secure SST in a vise.

SST: 09727-00051

SST: 09727-30022

09727-00010

09727-00031

(b) Attach the hooks of each SST arm across the diameter of the coil spring.

CAUTION:

Make sure that the hooks are securely attached to the coil spring.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Make sure that the hooks of the upper and lower SST arms are attached to the coil spring so that the distance between the hooks is as large as possible.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Make sure that the arms of SST are parallel and the number of coils between the arms is the same on each side.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

CAUTION:

Make sure that the stopper pins are installed securely.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

(d) Install SST and 2 vehicle nuts to the upper support as shown in the illustration.

SST: 09727-30022

09727-00090

09727-00100

*a	Vehicle Nut

(e) Using SST, compress the coil spring.

CAUTION:

If the coil spring starts to bow out while using SST, stop immediately and reattach SST correctly.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Do not compress the coil spring to the point where the coils touch each other.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.
Do not use an impact wrench.
If an impact wrench is used, the threads of SST may be damaged, or sudden compression of the coil spring may cause a hook to disengage and the coil spring to fly out, resulting in injury.
If a stopper pin touches the coil spring while using SST, remove the stopper pin and continue with the procedure.
If a stopper pin is removed, install a coil spring stopper belt as shown in the illustration.
If a hook disengages from the coil spring, the coil spring may fly out, resulting in injury.

SST: 09727-00110

(f) Check that the coil spring has become detached, and then remove the front support to front shock absorber nut.

CAUTION:

Do not remove the front support to front shock absorber nut while the coil spring is under tension.
If the front support to front shock absorber nut is removed with the coil spring under tension, components of the front shock absorber with coil spring may fly off, resulting in injury.

9. REMOVE FRONT SUSPENSION SUPPORT SUB-ASSEMBLY

(a) Remove the front suspension support sub-assembly from the front shock absorber assembly.

10. REMOVE STRUT MOUNTING BEARING WITH DUST COVER

(a) Disengage the end of the front No. 1 shock absorber dust cover from the claws of the front shock absorber assembly.

*1	Front No. 1 Shock Absorber Dust Cover
*a	Claw

(b) Remove the strut mounting bearing with dust cover from the front shock absorber assembly.

11. REMOVE FRONT UPPER COIL SPRING INSULATOR

(a) Remove the front upper coil spring insulator from the strut mounting bearing.

12. REMOVE STRUT MOUNTING BEARING

(a) Disengage the top end of the front No. 1 shock absorber dust cover to remove the strut mounting bearing from the shock absorber dust cover.

13. REMOVE FRONT COIL SPRING

(a) Remove the front coil spring and SST.

NOTICE:

Do not use an impact wrench. It will damage SST.

14. REMOVE FRONT SPRING BUMPER

(a) Remove the front spring bumper from the front shock absorber assembly.

15. REMOVE FRONT LOWER COIL SPRING INSULATOR

(a) Remove the front lower coil spring insulator from the front shock absorber assembly.

16. REMOVE SUSPENSION TOWER DAMPER (w/ Suspension Tower Damper)

(a) Remove the bolt and suspension tower damper from the front shock absorber assembly.

17. REMOVE FRONT SHOCK ABSORBER ASSEMBLY

Front Lower Suspension Arm

Front Stabilizer Bar

See More:

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