Problem Symptoms Table
ELECTRONIC POWER STEERING SYSTEM
PROBLEM SYMPTOMS CHART
| Symptom | Suspected area | See |
|---|---|---|
| Steering is heavy. | 1. Front tires (Improperly inflated, unevenly worm) | FRONT WHEEL ALIGNMENT |
| 2. Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| 3. Front suspension | INSPECTION | |
| 4. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) | |
| 5. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| 6. Steering column assembly (Manual tilt) | REMOVAL | |
| 7. Steering column assembly (Power tilt and Power telescopic) | REMOVAL | |
| 8. Battery and power source system | - | |
| 9. Power source voltage of power steering ECU assembly | PS WARNING LIGHT REMAINS ON | |
| 10. Power steering ECU assembly | POWER STEERING ECU | |
| 11. Vehicle condition (The steering wheel is turned from left to right repeatedly with the vehicles 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 is not recorded correctly) | CALIBRATION |
| 2. Front tires (Improperly inflated, unevenly worm) | FRONT WHEEL ALIGNMENT | |
| 3. Front wheel alignment (Incorrect) | FRONT WHEEL ALIGNMENT | |
| 4. Front suspension | INSPECTION | |
| 5. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) | |
| 6. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| 7. Steering column assembly (Manual tilt) | REMOVAL | |
| 8. Steering column assembly (Power tilt and Power telescopic) | 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. Speed sensor | - |
| 2. Skid control ECU | SKID CONTROL ECU (W/ VDIM) | |
| 3. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) | |
| 4. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| 5. Power steering ECU assembly | POWER STEERING ECU | |
| Friction sounds occur when turning the steering wheel during low speed driving. | 1. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| 3. Power steering ECU assembly | POWER STEERING ECU | |
| High-pitched sounds (squeaking) occur when turning the steering wheel slowly with the stepped. | 1. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| The steering wheel vibrates and noise occur when turning the steering wheel with the vehicle stopped. | 1. Power steering gear assembly (2WD) | STEERING GEAR (FOR 2WD) |
| 2. Power steering gear assembly (4WD) | STEERING GEAR (FOR 4WD) | |
| 3. Steering column assembly (Manual tilt) | REMOVAL | |
| 4. Steering column assembly (Power tilt and Power telescopic) | REMOVAL | |
| PS warning light remains on. | 1. PS warning light remains on | PS WARNING LIGHT REMAINS ON |
| PS warning light does not come on. | 1. PS warning light does not come on | PS WARNING LIGHT DOES NOT COME ON |