VEHICLE STABILITY CONTROL SYSTEM ABS Operates Before Necessary When Braking

DESCRIPTION

Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc.

PROCEDURE


  1. PERFORM TEST MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CIRCUIT)


    1. Using the GTS, perform a Test Mode (Signal Check) inspection sensor check and check that speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Utility
      Tester Display
      Signal Check
      OK
      Speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.
      Result
      Proceed to
      OK (for Front) A
      OK (for Rear) B
      NG C

      Note


      • When cleaning the front speed sensor, make sure to clean the installation hole before installation.

      • Do not use parts cleaner when cleaning the front speed sensor rotor.

      Tech Tips

      The rear speed sensor and rear speed sensor rotor are incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor and rear speed sensor rotor need to be replaced, replace the rear axle hub and bearing assembly.


    A

    CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

    B

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    C

    INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT