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 | Drive mode select switch circuit | |
| EPS warning light remains on | EPS warning light circuit | |
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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
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
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Reassembly
REASSEMBLY PROCEDURE 1. INSTALL NO. 2 OIL NOZZLE SUB-ASSEMBLY (a) Using a 5 mm hexagon wrench, install the 4 No. 2 oil nozzle sub-assemblies to the cylinder block sub-assembly with the 4 bolts. Torque: 10 N·m {102 kgf·cm, 7 ft·lbf} 2. INSTALL NO. 1 OIL NOZZLE SUB-ASSEMBLY (a) U
Utility
UTILITY NOTICE:
If the HV battery or an HV supply stack sub-assembly has been replaced, make sure to perform the following utilities in the following order: "Battery Status Info Update", "Prediagnostic Battery Charge" then "Battery Diagnosis".
"Have Traction Battery Inspected" is displayed, per
