Tech Tips
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Heavy steering | Front tires (improperly inflated, unevenly worn) | |
| Front wheel alignment (incorrect) | ||
| Front suspension (lower ball joint) | ||
| Steering column assembly | ||
| Torque sensor (built into steering column assembly) | ||
| Power steering motor | ||
| Speed sensor | ||
| Skid control ECU | ||
| Battery and power source system | - | |
| Power steering ECU power source voltage and relay | ||
| Power steering ECU | ||
| Steering effort differs between 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 | ||
| Torque sensor (built into steering column assembly) | ||
| Steering column assembly | ||
| Power steering motor | ||
| Power steering ECU | ||
| 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 | ||
| Skid control ECU | ||
| Combination meter assembly | ||
| Engine speed detection circuit | - | |
| Torque sensor (built into steering column assembly) | ||
| Power steering motor | ||
| Power steering ECU | ||
| CAN communication system | ||
| A knocking (or cranking) sound occurs when turning the steering wheel back and forth while power steering is in operation | Front suspension (lower ball joint) | |
| Steering intermediate shaft | ||
| Power steering ECU | ||
| Noise occurs when turning the steering wheel during low-speed driving | Power steering gear | |
| Steering column assembly | ||
| Friction occurs when turning the steering wheel during low-speed driving | Power steering motor | |
| Steering column assembly | ||
| A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped | Power steering motor | |
| The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped | Power steering gear | |
| Steering column assembly | ||
| P/S warning light does not come on or always illuminated on the combination meter | Power source voltage of power steering ECU | |
| EPS warning light circuit | ||
| Power steering ECU |