Problem Symptoms Table
ELECTRONIC POWER STEERING SYSTEM
ELECTRONIC POWER STEERING SYSTEM - PROBLEM SYMPTOMS CHART
| 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 assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) | |
| 5. Power steering link assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| 6. Steering column assembly (for 2GR-FSE) | REMOVAL | |
| 7. Steering column assembly (for 3UZ-FE) | REMOVAL | |
| 8. Battery and power source system | - | |
| 9. Power source voltage of power steering ECU assembly | IG POWER SOURCE CIRCUIT | |
| 10. Power steering ECU assembly | POWER STEERING ECU | |
| 11. 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 right and left, or is uneven | 1. Power steering ECU assembly (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 assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) | |
| 6. Power steering link assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| 7. Steering column assembly (for 2GR-FSE) | REMOVAL | |
| 8. Steering column assembly (for 3UZ-FE) | REMOVAL | |
| 9. Power steering ECU assembly | POWER STEERING ECU | |
| 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 (for 2WD) | INSPECTION | |
| 3. Speed sensor (for 4WD) | INSPECTION | |
| 4. Brake actuator (for 2GR-FSE) | REMOVAL | |
| 5. Brake actuator (for 3UZ-FE) | REMOVAL | |
| 6. Skid control ECU | REMOVAL | |
| 7. Power steering link assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) | |
| 8. Power steering link assembly (Torque sensor, motor rotation angle sensor, power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| 9. Power steering ECU assembly | POWER STEERING ECU | |
| 10. CAN communication system | SYSTEM DESCRIPTION | |
| Friction sounds occur when turning the steering wheel during low speed driving | 1. Power steering link assembly (Power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering link assembly (Power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| 3. Steering column assembly (for 2GR-FSE) | REMOVAL | |
| 4. Steering column assembly (for 3UZ-FE) | REMOVAL | |
| High-pitched sounds (squeaking) occur when turning the steering wheel slowly with the vehicle stopped | 1. Power steering link assembly (Power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering link assembly (Power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| The steering wheel vibrates and noise occurs when turning the steering wheel with the vehicle stopped | 1. Power steering link assembly (Power steering motor) (for 2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering link assembly (Power steering motor) (for 4WD) | STEERING GEAR (FOR 4WD) | |
| 3. Steering column assembly (for 2GR-FSE) | REMOVAL | |
| 4. Steering column assembly (for 3UZ-FE) | 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 assembly | POWER STEERING ECU |