Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: 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 | Front tires (improperly inflated, unevenly worn) | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Steering gear assembly | | |
| Battery and power source circuit | | |
| Power source voltage of power steering ECU assembly | | |
| Power steering ECU assembly | | |
| Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle) | | |
| 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) | | |
| Steering gear assembly | | |
| Torque sensor (Electric power steering column sub-assembly) | | |
| Electric power steering column sub-assembly | | |
| Power steering ECU assembly | | |
| 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 actuator assembly) | |
| Speed sensor | | |
| Torque sensor (Electric power steering column sub-assembly) | | |
| Power steering ECU assembly | | |
| CAN communication system | | |
| Friction sounds occur when turning steering wheel during low speed driving | Power steering motor (Power steering ECU assembly) | |
| Electric power steering column sub-assembly | | |
| Spiral with cable sensor sub-assembly | | |
| Steering column cover contacting steering wheel assembly | | |
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Power steering motor (Power steering ECU assembly) | |
| Steering wheel installation (incorrect) | | |
| Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock | Power steering motor (Power steering ECU assembly) | |
| Electric power steering column sub-assembly | | |
| Steering wheel installation (incorrect) | | |
| EPS warning light remains on | EPS warning light circuit | |
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Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the c ...
System Description
SYSTEM DESCRIPTION DESCRIPTION The power steering system generates torque through the operation of the motor and the reduction gear installed on the column shaft in order to assist steering effort. Th ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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