Lexus NX: 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) | | |
| Electric power steering column sub-assembly | | |
| Steering gear assembly | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| Speed sensor circuit | | |
| Auxiliary battery and power source system | - | |
| Power steering ECU assembly power source voltage | | |
| Power steering ECU assembly | | |
| Steering effort differs between turning right and left, or steering effort is uneven | Front tires (improperly inflated, unevenly worn) | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Steering gear assembly | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Electric power steering column sub-assembly | | |
| Power steering motor assembly | - | |
| Power steering ECU assembly | | |
| While driving, steering effort does not change in accordance with vehicle speed or the steering wheel does not return properly | Front suspension (Lower ball joint) | |
| Speed sensor circuit | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| Power steering ECU assembly | | |
| CAN communication system | | |
| A knocking (or clunking) sound occurs when turning the steering wheel back and forth while power steering is operating | Front suspension (Lower ball joint) | |
| Steering intermediate shaft | - | |
| Power steering ECU assembly | | |
| Noise occurs when turning the steering wheel during low-speed driving | Steering gear assembly | |
| Electric power steering column sub-assembly | | |
| Friction occurs when turning the steering wheel during low-speed driving | Power steering motor assembly | - |
| Electric power steering column sub-assembly | | |
| A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped | Power steering motor assembly | - |
| The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped | Power steering motor assembly | - |
| Steering gear assembly | | |
| Electric power steering column sub-assembly | | |
| Power steering warning light remains on | Power steering warning light circuit | |
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