ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster) 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) (for 2WD) A OK (for Front) (for AWD) B OK (for Rear) NG C

      Note

      
      

      • When cleaning the front speed sensor (for AWD) or rear speed sensor, make sure to clean the installation hole before installation.

      • Do not use parts cleaner when cleaning the front speed sensor rotor (for AWD) or rear speed sensor rotor.

      • Do not use parts cleaner when cleaning the front speed sensor (for AWD) or rear speed sensor.

      Tech Tips

      The front speed sensor and front speed sensor rotor (for 2WD) are incorporated into the front axle hub sub-assembly.

      If the front speed sensor and front speed sensor rotor (for 2WD) need to be replaced, replace the front axle hub sub-assembly.

   
   

   A

   REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

   B

   CLEAN SPEED SENSOR AND SPEED SENSOR ROTOR

   C

   INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT