VEHICLE STABILITY CONTROL SYSTEM ABS does not Operate

DESCRIPTION

When the vehicle stability control system is operating, as the input piston and output piston are not directly connected, the kickback of the brake pedal is minimal during ABS operation and the driver may not notice that ABS operated.

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

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PROCEDURE


  1. BRAKE PROBLEM CHECK


    1. Check if the slip indicator light was illuminated or blinking when ABS did not operate.

      Tech Tips


      • When the VSC system is normal and ABS is operating, the slip indicator light blinks.

      • When the VSC system is malfunctioning, the slip indicator light illuminates.

      Result
      Result Proceed to
      The slip indicator light was blinking. A
      The slip indicator light was illuminated. B

    A

    END

    B

  2. CHECK DTC AND FREEZE FRAME DATA


    1. Using the GTS, check DTCs and Freeze Frame Data.

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      Chassis > ABS/VSC/TRC/EPB > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  3. PERFORM OPERATION CHECK DRIVING


    1. Check that ABS operates using a drum tester or equivalent.

      CAUTION:

      When using a drum tester, enter Inspection Mode or VSC off mode and perform inspection with the TRC and VSC systems disabled to prevent the vehicle from moving suddenly due to TRC or VSC operation.

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      OK
      ABS operates.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here