ELECTRONICALLY CONTROLLED BRAKE 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 > Utility
      Tester Display
      Signal Check
      OK
      Speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.
      Result
      Result Proceed to
      OK (for Front) A
      OK (for Rear) B
      NG C

      Note


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

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

      Tech Tips

      The front speed sensor and front speed sensor rotor are incorporated into the front axle hub sub-assembly.

      If the front speed sensor and front speed sensor rotor need to be replaced, replace the front axle hub sub-assembly.


    A

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    B

    CLEAN REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

    C

    INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT