Lexus ES: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Heavy steering | Check assist limit record | |
| Front tires (improperly inflated, unevenly worn) | | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Rack and pinion power steering gear assembly | | |
| Steering effort differs between right and left or is uneven | Rotation angle sensor initialization and torque sensor zero point calibration incomplete | |
| Front tires (improperly inflated, unevenly worn) | | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Rack and pinion power steering gear assembly | | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily | Skid control ECU (Brake Booster with Master Cylinder Assembly) | |
| Speed sensor | | |
| Rack and pinion power steering gear assembly | | |
| CAN communication system | | |
| Friction sounds occur when turning steering wheel during low speed driving | Rack and pinion power steering gear assembly | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| Spiral cable with sensor sub-assembly | | |
| Steering column cover contacting steering wheel assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column cover contacting steering wheel assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Rack and pinion power steering gear assembly | |
| Steering wheel installation (incorrect) | | |
| Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock | Rack and pinion power steering gear assembly | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| Steering wheel installation (incorrect) | | |
| Drive mode does not change | Drive mode select switch circuit | |
| EPS warning light remains on | EPS warning light circuit | |
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
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Cornering Light Circuit
DESCRIPTION The headlight ECU sub-assembly controls the cornering lights. WIRING DIAGRAM except Bulb Type Turn Signal Light (for TMMK Made) for Bulb Type Turn Signal Light (for TMMK Made) CAUTION / NOTICE / HINT NOTICE:
If the headlight ECU sub-assembly LH has been replaced, it is necessary to
Cornering Light Circuit
DESCRIPTION The headlight ECU sub-assembly controls the cornering lights. WIRING DIAGRAM except Bulb Type Turn Signal Light (for TMMK Made) for Bulb Type Turn Signal Light (for TMMK Made) CAUTION / NOTICE / HINT NOTICE:
If the headlight ECU sub-assembly LH has been replaced, it is necessary to
