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

CAUTION / NOTICE / HINT

Note

When replacing the steering actuator assembly, perform actuator angle neutral position calibration and initialization after replacement Click here.

PROCEDURE


  1. CHECK FOR DTC (DYNAMIC REAR STEERING SYSTEM)


    1. Check for DTCs in the dynamic rear steering system Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO DYNAMIC REAR STEERING SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. READ VALUE USING GTS (ABNORMAL OPERATION HISTORY)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / VGRS / Data List / Abnormal Operation History.

    6. According to the display on the GTS, read the Abnormal Operation History.

      VGRS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Limited Control Count(Overheat-Weak)

      Limited control count (overheat-weak)/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that overheat status of VGRS became "Overheat-Weak" and then the control was limited.
      Limited Control Count(Overheat-Mid)

      Limited control count (overheat-mid)/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that overheat status of VGRS became "Overheat-Mid" and then the control was limited.
      Limited Control Count(Overheat-Strong)

      Limited control count (overheat-strong)/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that overheat status of VGRS became "Overheat-Strong" and then the control was limited.
      N Pos Stop Control Count

      N pos stop control count/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that power supply status to VGRS became "N Pos Stop" and then the control in "N Pos Stop" happened.
      Cur Pos Stop Control Count

      Cur pos stop control count/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that power supply status to VGRS became "Cur Pos Stop" and then the control in "Cur Pos Stop" happened.
      Prompt Stop Control Count

      Prompt stop control count/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that power supply status to VGRS became "Prompt Stop" and then the control in "Prompt Stop" happened.
      Limited Control Count(System Heavily-loaded)

      Limited control count (system heavily-loaded)/

      Min.: 0

      Max.: 255

      		 - The number of times which shows that VGRS system became heavily-loaded and then the control was limited.
      Result
      Result Proceed to
      One of the Data List items has a count of 1 or more. A
      Other than above B

      Tech Tips

      When there is a decrease or increase in power source voltage, or during overheating prevention, VGRS system operation stops temporarily.


    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  4. CUSTOMER PROBLEM ANALYSIS


    1. Check if operation stopped under harsh conditions, such as the steering wheel being repeatedly turned while the vehicle is stationary.

      Result
      Result Proceed to
      Operation stopped under conditions that are not harsh A
      Operation stopped under harsh conditions B

      Tech Tips

      When the torque load is large, such as when driving on rough road, VGRS system operation stops to protect the system.


    B

    CHECK VARIABLE GEAR RATIO STEERING SYSTEM Click here

    A

  5. CHECK STEERING EFFORT


    1. Check the steering torque when the steering wheel is turned with the vehicle stopped Click here.

      OK
      The steering torque is normal.

      Tech Tips

      When the steering effort is large, VGRS system operation stops to protect the system.


    NG

    GO TO POWER STEERING SYSTEM (PROBLEM SYMPTOMS TABLE) Click here

    OK

  6. CHECK STEERING ACTUATOR ASSEMBLY


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

      OK
      Neither abnormal noise nor vibration occurs.

    B

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    A

  7. CHECK VARIABLE GEAR RATIO STEERING SYSTEM


    1. Operate the steering wheel and check that the system recovers.

      Result
      Result Proceed to
      The system recovers when the steering wheel is operated. A
      The system recovers when the steering wheel is not operated. B

    A

    END

    B

    REPLACE STEERING ACTUATOR ASSEMBLY Click here