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 |
|---|---|---|
| Steering is heavy | 1. Front tires (Improperly inflated, unevenly worn) | TIRE AND WHEEL SYSTEM |
| 2. Front wheel alignment (incorrect) | FRONT WHEEL ALIGNMENT | |
| 3. Front suspension (Lower ball joint) | FRONT LOWER BALL JOINT | |
| 4. Steering gear | STEERING GEAR | |
| 5. Torque sensor (built into steering column) | DTC C1515 TORQUE SENSOR ZERO POINT ADJUSTMENT UNDONE | |
| 6. Steering column | STEERING COLUMN ASSEMBLY | |
| 7. Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION | |
| 8. Battery and power source system | - | |
| 9. Power source voltage of power steering ECU | DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF; DTC U0121 LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE | |
| 10. Power steering ECU | STEERING CONTROL ECU | |
| Steering effort differs between right and left or is uneven | 1. Steering center point (zero point) is not recorded completely | STEERING GEAR |
| 2. Front tires (Improperly inflated, unevenly worn) | TIRE AND WHEEL SYSTEM | |
| 3. Front wheel alignment (incorrect) | FRONT WHEEL ALIGNMENT | |
| 4. Front suspension (Lower ball joint) | FRONT LOWER BALL JOINT | |
| 5. Steering gear | STEERING GEAR | |
| 6. Torque sensor (built into steering column) | DTC C1515 TORQUE SENSOR ZERO POINT ADJUSTMENT UNDONE | |
| 7. Steering column | STEERING COLUMN ASSEMBLY | |
| 8. Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION | |
| 9. Power steering ECU | STEERING CONTROL ECU | |
| While driving, steering effort does not change in accordance with vehicle speed or steering wheel does not return properly | 1. Front suspension | - |
| 2. Speed sensor | FRONT SPEED SENSOR | |
| 3. Skid control ECU | SKID CONTROL ECU | |
| 4. Engine speed detection circuit | - | |
| 5. ECM | ECM | |
| 6. Torque sensor (built into steering column) | DTC C1515 TORQUE SENSOR ZERO POINT ADJUSTMENT UNDONE | |
| 7. Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION | |
| 8. Power steering ECU | STEERING CONTROL ECU | |
| 9. CAN communication system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Clunking sound occurs when turning steering wheel back and forth while power steering is in operation | 1. Front suspension | - |
| 2. Steering intermediate shaft | - | |
| 3. Steering gear | STEERING GEAR | |
| Friction sound occurs when turning steering wheel during low speed driving | 1. Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION |
| 2. Steering column | STEERING COLUMN ASSEMBLY | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION |
| Steering wheel vibrates and noise occurs when turning steering wheel with the vehicle stopped | 1. Power steering motor | DTC C1524 MOTOR CIRCUIT MALFUNCTION |
| 2. Steering column | STEERING COLUMN ASSEMBLY | |
| PS warning is always indicated on multi-display | 1. Power steering ECU | STEERING CONTROL ECU |
| 2. Wire harness | DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF; DTC U0121 LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE | |
| 3. CAN communication system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 4. Multi-display | MULTI-DISPLAY |