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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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
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Installation
INSTALLATION PROCEDURE 1. INSTALL ENGINE WATER PUMP ASSEMBLY (a) Install a new gasket and the engine water pump assembly with the 5 bolts in the order shown in the illustration. Torque: 10 N·m {102 kgf·cm, 7 ft·lbf} 2. INSTALL V-RIBBED BELT TENSIONER ASSEMBLY (a) Using a 12 mm
Poor Sound Quality in All Modes (Low Volume)
PROCEDURE 1. CHECK AUDIO SETTINGS (a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal. HINT: Sound quality adjustment measures vary according to the type of amplifier. OK END
NG 2. COMPARE
