Lexus NX: System Description
SYSTEM 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.
- The power steering ECU assembly determines the direction and amount of assist power in accordance with vehicle speed signals and signals from the torque sensor built into the electric power steering column sub-assembly. As a result, the power steering ECU assembly adjusts the steering effort so that it is lighter during low speed driving and heavier during high speed driving.
DESCRIPTION
(a) Power steering ECU assembly:
The power steering ECU assembly calculates assist power based on steering torque signals from the torque sensor and vehicle speed signals from the skid control ECU.
(b) Torque sensor:
The torque sensor detects the steering effort generated when the steering wheel is turned and converts it to an electrical signal.
(c) Power steering motor:
The power steering motor is activated by the current from the power steering ECU assembly and generates torque to assist the steering effort.
(d) Motor rotation angle sensor:
The motor rotation angle sensor consists of a resolver sensor, which excels in reliability and durability. The rotation angle sensor detects the rotation angle of the motor and sends it to the power steering ECU assembly. As a result, it ensures efficient power steering control.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the power steering system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Calibration
CALIBRATION TORQUE SENSOR ZERO POINT CALIBRATION (USING THE Techstream) NOTICE: Perform torque sensor zero point calibration if any of the following conditions occur:
The power steering ECU assembl
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
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Thermostat
ComponentsCOMPONENTS ILLUSTRATION *1 THERMOSTAT *2 WATER INLET *3 GASKET - - N*m (kgf*cm, ft.*lbf): Specified torque ● Non-reusable part RemovalREMOVAL PROCEDURE 1. DRAIN ENGINE COOLANT Click here 2. DISCONNECT WATER INLET (a) Remove the 2 nuts and disconne
Removal
REMOVAL CAUTION / NOTICE / HINT NOTICE:
When replacing the forward recognition camera, replace it with a new one.
Replace the forward recognition camera if there is any foreign matter on the camera lens.
Do not touch the camera lens or the front windshield glass in front of the camera.
If t
