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 CHART
| Symptom | Suspected Area | Refer to |
|---|---|---|
| Heavy steering | 1. Front tires (improperly inflated, unevenly worn) | INSPECTION |
| 2. Front wheel alignment (incorrect) | FRONT WHEEL ALIGNMENT | |
| 3. Front suspension (lower ball joint) | INSPECTION | |
| 4. Steering gear assembly | STEERING GEAR | |
| 5. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE | |
| 6. Power source voltage of power steering ECU | EPS WARNING LIGHT CIRCUIT | |
| 7. Power steering ECU | POWER STEERING ECU | |
| Steering effort differs between turning right and left, or steering effort uneven | 1. Front tires (improperly inflated, unevenly worn) | INSPECTION |
| 2. Front wheel alignment (incorrect) | FRONT WHEEL ALIGNMENT | |
| 3. Front suspension (lower ball joint) | INSPECTION | |
| 4. Steering gear assembly | STEERING GEAR | |
| 5. Torque sensor (built into steering column) | DTC C1511/11 TORQUE SENSOR 1 MALFUNCTION; DTC C1512/11 TORQUE SENSOR 2 MALFUNCTION; DTC C1513/11 TORQUE SENSOR DEVIATION EXCESSIVE; DTC C1514/11 TORQUE SENSOR POWER SUPPLY VOLTAGE MALFUNCTION | |
| 6. Steering column assembly | REMOVAL | |
| 7. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE | |
| 8. Power steering ECU | POWER STEERING ECU | |
| While driving, steering effort does not change in accordance with vehicle speed or steering wheel does not return properly | 1. Front suspension (lower ball joint) | INSPECTION |
| 2. Speed sensor | TEST MODE PROCEDURE | |
| 3. Skid control ECU | TERMINALS OF ECU | |
| 4. Torque sensor (built into steering column) | DTC C1511/11 TORQUE SENSOR 1 MALFUNCTION; DTC C1512/11 TORQUE SENSOR 2 MALFUNCTION; DTC C1513/11 TORQUE SENSOR DEVIATION EXCESSIVE; DTC C1514/11 TORQUE SENSOR POWER SUPPLY VOLTAGE MALFUNCTION | |
| 5. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE | |
| 6. Power steering ECU | POWER STEERING ECU | |
| 7. CAN communication system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Friction occurs when turning steering wheel during low speed driving | 1. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE |
| 2. Steering column assembly | REMOVAL | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | 1. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE |
| Steering wheel vibrates and noise occurs when turning steering wheel with vehicle stopped | 1. Power steering motor | DTC C1524/24 MOTOR TERMINAL VOLTAGE MALFUNCTION; DTC C1555/25 MOTOR RELAY WELDING FAILURE |
| 2. Steering column assembly | REMOVAL | |
| P/S warning always indicated on combination meter | 1. Power source voltage of power steering ECU | EPS WARNING LIGHT CIRCUIT |
| 2. Combination meter | REMOVAL | |
| 3. Power steering ECU | POWER STEERING ECU |