Power Steering System - Problem Symptoms Table

Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING


POWER STEERING SYSTEM - PROBLEM SYMPTOMS TABLE

  • HINT:
  • Use the table below to help determine the cause of the problem. The numbers indicate likely causes of the problem in order. Check each part in order. If necessary, repair or replace the faulty parts.
POWER STEERING SYSTEM:
SymptomSuspected areaSee page
Steering is heavy. 1. Front tires (Improperly inflated, unevenly worn)
2. Front wheel alignment (Incorrect)
3. Front suspension (Lower ball joint)
4. Steering column assembly (for Power Tilt and Power Telescopic)
5. Steering column assembly (for Manual Tilt and Manual Telescopic)
6. Torque sensor (Built into steering gear assembly) -
7. Power steering motor -
8. Speed sensor -
9. Skid control ECU -
10. Battery and power source system -
11. Power steering ECU power source voltage and relay -
12. Power steering ECU -
Steering effort differs between right and left or is uneven. 1. Calibration of turning angle sensor output and torque sensor zero point is not completed
2. Front tires (Improperly inflated, unevenly worn)
3. Front wheel alignment (Incorrect)
4. Front suspension (Lower ball joint)
5. Power steering gear
6. Torque sensor (Built into steering link assembly) -
7. Steering column assembly (for Power Tilt and Power Telescopic)
8. Steering column assembly (for Manual Tilt and Manual Telescopic)
9. Power steering motor -
10. Power steering ECU -
While driving, steering effort does not change in accordance with vehicle speed or the steering wheel does not return properly. 1. Front suspension (Lower ball joint)
2. Speed sensor -
3. Skid control ECU -
4. Combination meter -
5. Engine speed detection circuit -
6. Torque sensor (Built into steering gear assembly) -
7. Power steering motor -
8. Power steering ECU -
A knocking (or cranking) sound occurs when turning the steering wheel back and forth while power steering is in operation. 1. Front suspension (Lower ball joint)
2. Steering intermediate shaft -
3. Power steering gear
Noise occurs when turning the steering wheel during low speed driving. 1. Power steering gear
2. Steering column assembly (for Power Tilt and Power Telescopic)
3. Steering column assembly (for Manual Tilt and Manual Telescopic)
A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped. Power steering motor -
The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock. 1. Power steering gear
2. Steering column assembly (for Power Tilt and Power Telescopic)
3. Steering column assembly (for Manual Tilt and Manual Telescopic)