Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Lexus LS 460LFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- The electrical equipment operation may be limited by the load control of electric power control system. Follow the HOW TO PROCEED WITH TROUBLESHOOTING procedures.
Power steering system:
POWER STEERING SYSTEM PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See Procedure |
|---|---|---|
| Steering is heavy. | Front tires (Improperly inflated, unevenly worn) | FRONT WHEEL ALIGNMENT |
| Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| Front suspension | ON-VEHICLE INSPECTION | |
| Power steering gear assembly (w/ VGRS) | REMOVAL | |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Steering column assembly (w/ VGRS) | REMOVAL | |
| Steering column assembly (w/o VGRS) | REMOVAL | |
| Battery and power source system | DATA LIST / ACTIVE TEST | |
| Power source voltage of power steering ECU | TERMINALS OF ECU | |
| Power steering converter assembly | REMOVAL | |
| Power steering ECU | TERMINALS OF ECU | |
| Vehicle condition (The steering wheel is turned from left to right repeatedly with the vehicle stopped or a heavy load is continuously applied to the vehicle) | DATA LIST / ACTIVE TEST | |
| Steering effort differs between right and left or is uneven. | Power steering ECU (Steering center point is not recorded correctly) | CALIBRATION |
| Front tires (Improperly inflated, unevenly worn) | FRONT WHEEL ALIGNMENT | |
| Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| Front suspension | ON-VEHICLE INSPECTION | |
| Power steering gear assembly (w/ VGRS) | REMOVAL | |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Steering column assembly (w/ VGRS) | REMOVAL | |
| Steering column assembly (w/o VGRS) | REMOVAL | |
| Power steering ECU | TERMINALS OF ECU | |
| While driving, steering effort does not change in accordance with vehicle speed, or the steering wheel does not return to its centered position easily. | Speed sensor | REMOVAL |
| Skid control ECU | TERMINALS OF ECU | |
| Power steering gear assembly (w/ VGRS) | REMOVAL | |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Power steering ECU | TERMINALS OF ECU | |
| Friction sounds occur when turning steering wheel during low speed driving. | Power steering gear assembly (w/ VGRS) | REMOVAL |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Power steering ECU | TERMINALS OF ECU | |
| PS warning light remains on. | PS warning light remains on | PS WARNING LIGHT REMAINS ON |
| A knocking (or cranking) sound occurs when turning the steering wheel back and forth while power steering is in operation. | Front suspension | ON-VEHICLE INSPECTION |
| Steering intermediate shaft | - | |
| Power steering gear assembly (w/ VGRS) | REMOVAL | |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Noise occurs when turning the steering wheel during low speed driving. | Power steering gear assembly (w/ VGRS) | REMOVAL |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Steering column assembly (w/ VGRS) | REMOVAL | |
| Steering column assembly (w/o VGRS) | REMOVAL | |
| High-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped. | Power steering gear assembly (w/ VGRS) | REMOVAL |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock. | Power steering gear assembly (w/ VGRS) | REMOVAL |
| Power steering gear assembly (w/o VGRS) | REMOVAL | |
| Steering column assembly (w/ VGRS) | REMOVAL | |
| Steering column assembly (w/o VGRS) | REMOVAL |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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