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 point calibration and initialization after replacement.

Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. READ VALUE USING GTS (ABNORMAL OPERATION HISTORY)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Chassis > VGRS > Data List
      Tester Display Measurement Item Range Diagnostic Note
      Limited Control Count(Overheat-Weak) Limited control count (overheat-weak)

      Min.: 0

      Max.: 255

      		 The number of times 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 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 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 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 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 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 that VGRS system became heavily-loaded and then the control was limited.

      Chassis > VGRS > Data List
      Tester Display
      Limited Control Count(Overheat-Weak)
      Limited Control Count(Overheat-Mid)
      Limited Control Count(Overheat-Strong)
      N Pos Stop Control Count
      Cur Pos Stop Control Count
      Prompt Stop Control Count
      Limited Control Count(System Heavily-loaded)
      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

  3. 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 roads, VGRS system operation stops to protect the system.


    B

    GO TO STEP 6 Click here

    A

  4. 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.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. CHECK STEERING ACTUATOR ASSEMBLY


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

      OK
      Neither abnormal noise nor vibration occurs.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    OK

  6. CHECK VGRS 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