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
| Symptom | Suspected area | See |
|---|---|---|
| Steering is heavy | 1. Front tires (Improperly inflated, unevenly worn) | Refer to ADJUSTMENT |
| 2. Front wheel alignment (Incorrect) | Refer to ADJUSTMENT | |
| 3. Front suspension (Lower ball joint) | Refer to REMOVAL | |
| 4. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | Refer to REMOVAL | |
| 5. Steering column | Refer to REMOVAL | |
| 6. Battery and power source system | - | |
| 7. Power source voltage of power steering ECU | Refer to IG Power Source Circuit | |
| 8. Power steering ECU | Refer to 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) | Refer to CALIBRATION |
| 2. Front tires (Improperly inflated, unevenly worn) | Refer to ADJUSTMENT | |
| 3. Front wheel alignment (Incorrect) | Refer to ADJUSTMENT | |
| 4. Front suspension (Lower ball joint) | Refer to REMOVAL | |
| 5. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | Refer to REMOVAL | |
| 6. Steering column | Refer to REMOVAL | |
| 7. Power steering ECU | Refer to 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) | Refer to REMOVAL |
| 2. Speed sensor | Refer to INSPECTION | |
| 3. Skid control ECU | Refer to COMPONENTS | |
| 4. Power steering link (Torque sensor, motor rotation angle sensor, power steering motor) | Refer to REMOVAL | |
| 5. Power steering ECU | Refer to REMOVAL | |
| 6. CAN communication system | Refer to SYSTEM DESCRIPTION | |
| Friction sounds occur when turning the steering wheel during low speed driving | 1. Power steering link (Power steering motor) | Refer to REMOVAL |
| 2. Steering column | Refer to REMOVAL | |
| High-pitched sounds (squeaking) occur when turning the steering wheel slowly with the vehicle stopped | 1. Power steering link (Power steering motor) | Refer to REMOVAL |
| The steering wheel vibrates and noise occurs when turning the steering wheel with the vehicle stopped | 1. Power steering link (Power steering motor) | Refer to REMOVAL |
| 2. Steering column | Refer to REMOVAL | |
| P/S warning light in the combination meter is always on | 1. IG power source circuit | Refer to IG Power Source Circuit |
| 2. Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Power steering ECU | Refer to REMOVAL |