Variable Gear Ratio Steering System Vgrs System Stops Or Does Not Operate

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

CHECK HEAT PROTECTION FUNCTION FOR STEERING ACTUATOR

CHECK STEERING EFFORT

CHECK STEERING ACTUATOR

CHECK WIRE HARNESS

VARIABLE GEAR RATIO STEERING SYSTEM - VGRS System Stops or does not Operate


INSPECTION PROCEDURE

HINT:
This problem may be caused by a malfunction in the ECB or EPS system.
Make sure that no DTC is output for the skid control ECU, power steering ECU, or steering control ECU before proceeding with the following procedures.
If a DTC is output for any of these ECUs, first troubleshoot it and then proceed.
1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and intelligent tester on.

  1. Select the DATA LIST mode on the intelligent tester.

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    Motor Overheat Record
    		Record of continuous overheat preventive control / Rec or Unrec
    		Rec or Unrec
    Result:
    A: "Rec" (Record motor overheating)
    B: "Unrec" (No record of motor overheating)
    HINT:
    If "Rec" is displayed, reset the setting to "Unrec". Refer to DATA LIST.


B
Go to step 3
A


2.CHECK HEAT PROTECTION FUNCTION FOR STEERING ACTUATOR

  1. Turn the engine switch on (IG) and wait for 30 minutes until the steering actuator cools down.

  1. Start the engine and slowly turn the steering wheel from lock to lock (approximately 90°/sec) 3 times.

    HINT:
    If turning the steering wheel quickly while driving at low speeds, the steering angle may differ between left and right, or the steering wheel may become off-center.
    However, this is not a malfunction.

  1. Check the number of turns from lock to lock.

    Result:
    A: 2.7 turns
    B: 3.2 turns


B
Go to step 3
A

VGRS SYSTEM IS NORMAL

3.CHECK STEERING EFFORT

  1. Start the engine.

  1. Turn the steering wheel.

  1. Check the steering effort.

    OK:
    Below 6.5 N*m (66 kgf*cm, 57 in.*lbf)
    HINT:
    After completing the inspection or repair, attempt to simulate the problem and then perform step 1 again to reconfirm that the problem does not occur.


NG
GO TO POWER STEERING SYSTEM
OK


4.CHECK STEERING ACTUATOR

  1. Check for an abnormal noise or vibration in the steering actuator.

    OK:
    Neither an abnormal noise or vibration occurs.


NG
GO TO STEERING WHEEL VIBRATES OR ABNORMAL NOISE IS HEARD FROM STEERING WHEEL
OK


5.CHECK WIRE HARNESS


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Variable Gear Ratio Steering System Vgrs System Stops Or Does Not Operate

  1. Turn the engine switch on (IG).

  1. Measure the voltage and resistance according to the value(s) in the table below.

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    A42-3 (IG) -
    Body ground
    		Engine switch on (IG)
    		10 to 14 V
    A42-8 (PIG) -
    Body ground
    		Engine switch on (IG)
    		10 to 14 V

  1. Turn the engine switch off.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    A40-7 (PGND) -
    Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE WIRE HARNESS
OK

REPLACE STEERING CONTROL ECU