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 the 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 assembly:
The power steering motor assembly 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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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
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
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Cargo and luggage
Take notice of the following information
about storage precautions,
cargo capacity and load.
WARNING
■Things that must not be carried in the
luggage compartment
The following things may cause a fire if
loaded in the luggage compartment:
Receptacles containing gasoline
Aerosol cans
Power Source Mode does not Change to ON (ACC)
DESCRIPTION If the power switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Related Data List and Active Test Items Problem Symptom Data List and Active Test Pow
