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) | | |
| Steering gear assembly | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor (built into power steering ECU assembly) | | |
| Auxiliary battery and power source system | - | |
| Power steering ECU assembly power source voltage | | |
| Power steering ECU assembly | | |
| Steering wheel is turned with vehicle stopped or heavy load is continuously applied to vehicle | - | |
| Steering effort differs between turning right and left, or steering effort is uneven | Calibration of torque sensor zero point are not completed | |
| 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 (built into power steering ECU 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 | Skid control ECU (brake booster with master cylinder assembly) | |
| Speed sensor circuit | | |
| Torque sensor (built into electric power steering column sub-assembly) | - | |
| Power steering motor (built into power steering ECU assembly) | | |
| Power steering ECU assembly | | |
| CAN communication system | | |
| 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 | Power steering motor (built into power steering ECU assembly) | |
| Electric power steering column sub-assembly | | |
| Spiral cable sub-assembly | | |
| Friction between the steering wheel and steering column cover | - | |
| Friction occurs when turning the steering wheel during low-speed driving | Power steering motor (built into power steering ECU assembly) | |
| Electric power steering column sub-assembly | | |
| High-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped | Power steering motor (built into power steering ECU assembly) | |
| Steering wheel installation condition | | |
| Steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped | Power steering motor (built into power steering ECU assembly) | |
| Electric power steering column sub-assembly | | |
| Steering wheel installation condition | | |
| Power steering warning light remains on | Auxiliary battery and power source system | - |
| 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:
Headlight switch
The headlights can be operated
manually or automatically.
Operating the switch turns on
the lights as follows:
Type A
The side marker, parking,
tail, license plate, instrument panel
lights, and daytime running lights turn on.
The headlights and all the
lights listed abov
Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) Whenever a road sign assist system DTC is stored, the forward recognition camera stores the current vehicle state (ECU and sensor information) as freeze frame data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c
