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.
ELECTRONIC POWER STEERING SYSTEM
PROBLEM SYMPTOMS TABLE - ELECTRONIC POWER STEERING SYSTEM
| Symptom | Suspected area | See |
|---|---|---|
| Steering is heavy | 1. Front tires (Improperly inflated, unevenly worn) | FRONT WHEEL ALIGNMENT |
| 2. Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| 3. Front suspension (Lower ball joint) | REMOVAL | |
| 4. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | REMOVAL | |
| 5. Steering column | REMOVAL | |
| 6. Battery and power source system | - | |
| 7. Power source voltage of power steering ECU | IG POWER SOURCE CIRCUIT | |
| 8. Power steering ECU | REMOVAL | |
| 9. 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) | - | |
| Steering effort differs between turning the steering wheel to the left and right, or is uneven | 1. Power steering ECU (Steering center point (zero point) is not recorded correctly) | CALIBRATION |
| 2. Front tires (Improperly inflated, unevenly worn) | FRONT WHEEL ALIGNMENT | |
| 3. Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| 4. Front suspension (Lower ball joint) | REMOVAL | |
| 5. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | REMOVAL | |
| 6. Steering column | REMOVAL | |
| 7. Power steering ECU | REMOVAL | |
| While driving, steering effort does not change in accordance with vehicle speed, or the steering wheel does not return to its centered position easily | 1. Front suspension (Lower ball joint) | REMOVAL |
| 2. Speed sensor | INSPECTION | |
| 3. Skid control ECU | SKID CONTROL ECU | |
| 4. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | REMOVAL | |
| 5. Power steering ECU | REMOVAL | |
| 6. CAN communication system | SYSTEM DESCRIPTION | |
| Friction sounds occur when turning the steering wheel during low speed driving | 1. Power steering link (Power steering motor) | REMOVAL |
| 2. Steering column | REMOVAL | |
| High-pitched sounds (squeaking) occur when turning the steering wheel slowly with the vehicle stopped | 1. Power steering link (Power steering motor) | REMOVAL |
| The steering wheel vibrates and noise occurs when turning the steering wheel with the vehicle stopped | 1. Power steering link (Power steering motor) | REMOVAL |
| 2. Steering column | REMOVAL | |
| P/S warning light in the combination meter is always on | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. Combination meter | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Power steering ECU | REMOVAL |