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 | 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 | | |
| Battery and power source circuit | | |
| Power source voltage of power steering ECU | | |
| Power steering ECU (Rack and pinion power steering gear assembly) | | |
| Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle) | | |
| CAN communication system | | |
| Steering effort differs between right and left or is uneven | Power steering motor (Rack and pinion power steering gear assembly) | |
| Torque sensor zero point calibration | | |
| 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 | | |
| Power steering ECU (Rack and pinion power steering gear assembly) | | |
| While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily | Power steering motor (Rack and pinion power steering gear assembly) | |
| Front tires (improperly inflated, unevenly worn) | | |
| Front wheel alignment (incorrect) | | |
| Combination meter assembly | | |
| Rack and pinion power steering gear assembly | | |
| Steering column assembly | | |
| Front suspension (Lower ball joint) | | |
| Skid control ECU (Brake actuator assembly) | | |
| Speed sensor | | |
| Torque sensor (Rack and pinion power steering gear assembly) | | |
| Power steering ECU (Rack and pinion power steering gear assembly) | | |
| CAN communication system | | |
| Knocking or clunking sound occurs when turning steering wheel back and forth while power steering is in operation | Rack and pinion power steering gear assembly | |
| Steering column assembly | | |
| Steering intermediate shaft assembly | | |
| Front suspension (Lower ball joint) | | |
| Friction sounds occur when turning steering wheel during low speed driving | Power steering motor (Rack and pinion power steering gear assembly) | |
| Steering column assembly | | |
| Spiral cable with sensor sub-assembly | | |
| Steering column cover contacting steering wheel assembly | | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Power steering motor (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 | Power steering motor (Rack and pinion power steering gear assembly) | |
| Steering column assembly | | |
| Steering wheel installation (incorrect) | |
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*1: for Manual Tilt and Manual Telescopic Steering Column
*2: for Power Tilt and Power Telescopic Steering Column
*3: for HV Model
*4: for Gasoline Model
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Problem Symptoms Table
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