Lexus NX: 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) | | |
| Electric power steering column sub-assembly | | |
| Steering gear assembly | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| Speed sensor circuit | | |
| Auxiliary battery and power source system | - | |
| Power steering ECU assembly power source voltage | | |
| Power steering ECU assembly | | |
| Steering effort differs between turning right and left, or steering effort is uneven | Front tires (improperly inflated, unevenly worn) | |
| Front wheel alignment (incorrect) | | |
| Front suspension (Lower ball joint) | | |
| Steering gear assembly | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Electric power steering column sub-assembly | | |
| Power steering motor assembly | - | |
| Power steering ECU assembly | | |
| While driving, steering effort does not change in accordance with vehicle speed or the steering wheel does not return properly | Front suspension (Lower ball joint) | |
| Speed sensor circuit | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| Power steering ECU assembly | | |
| CAN communication system | | |
| A knocking (or clunking) sound occurs when turning the steering wheel back and forth while power steering is operating | Front suspension (Lower ball joint) | |
| Steering intermediate shaft | - | |
| Power steering ECU assembly | | |
| Noise occurs when turning the steering wheel during low-speed driving | Steering gear assembly | |
| Electric power steering column sub-assembly | | |
| Friction occurs when turning the steering wheel during low-speed driving | Power steering motor assembly | - |
| Electric power steering column sub-assembly | | |
| A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped | Power steering motor assembly | - |
| The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped | Power steering motor assembly | - |
| Steering gear assembly | | |
| Electric power steering column sub-assembly | | |
| Power steering warning light remains on | Power steering warning light circuit | |
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READ NEXT:
Terminals Of Ecu
TERMINALS OF ECU *a Component with harness connected (Power Steering ECU Assembly) - - CHECK POWER STEERING ECU ASSEMBLY (a) Measure the voltage and resistance according to the value(s) i
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 power steering warning light (red or yellow) on the combina
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (USING THE 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 f
SEE MORE:
Lost Communication with Brake System Control Module (U0129,U0293,U1104)
DESCRIPTION The power steering ECU assembly receives signals from the hybrid vehicle control ECU, skid control ECU(brake booster with master cylinder assembly) and forward recognition camera via the CAN communication system. DTC No. Detection Item DTC Detection Condition Trouble Area Warn
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovere
