Lexus ES: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Heavy steering | Check assist limit record | |
| Front tires (improperly inflated, unevenly worn) | | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Rack and pinion power steering gear assembly | | |
| Steering effort differs between right and left or is uneven | Rotation angle sensor initialization and torque sensor zero point calibration incomplete | |
| Front tires (improperly inflated, unevenly worn) | | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Rack and pinion power steering gear assembly | | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily | Skid control ECU (Brake Booster with Master Cylinder Assembly) | |
| Speed sensor | | |
| Rack and pinion power steering gear assembly | | |
| CAN communication system | | |
| Friction sounds occur when turning steering wheel during low speed driving | Rack and pinion power steering gear assembly | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| Spiral cable with sensor sub-assembly | | |
| Steering column cover contacting steering wheel assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column cover contacting steering wheel assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Rack and pinion power steering gear assembly | |
| Steering wheel installation (incorrect) | | |
| Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock | Rack and pinion power steering gear assembly | |
| Steering column assembly (for Manual Tilt and Manual Telescopic Steering Column) | | |
| Steering column assembly (for Power Tilt and Power Telescopic Steering Column) | | |
| Steering wheel installation (incorrect) | | |
| Drive mode does not change | Pattern select switch sport mode circuit (for NICKEL METAL HYDRIDE BATTERY) | |
| Pattern select switch sport mode circuit (for LITHIUM-ION BATTERY) | | |
| EPS warning light remains on | EPS warning light circuit | |
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Terminals Of Ecu
TERMINALS OF ECU TERMINALS OF ECU *a Component without harness connected (Rack and Pinion Power Steering Gear Assembly) - - HINT:
The rack and pinion power steering gear assembly uses
Diagnosis System
DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here CHECK WARNING LIGHT (a) When a problem occurs in the power steering system, the EPS warning light in the combination meter assembly comes o
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTCs (USING TECHSTREAM) (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the foll
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during HV converter kit removal/installation are shown below. Necessary Procedures After Parts Removed/Installe
Calibration
CALIBRATION NOTICE: When any of the following parts have been replaced, perform adjustment shown in the following table. If not, the parking support alert system may not operate correctly. ADJUST PARKING SUPPORT ALERT SYSTEM The necessary procedures (adjustment, calibration, initialization or regist
