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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (6 Of 6), Circuit Tests & Symptom Tests >> Electronically Controlled Brake System >> ABS Operates Before Necessary When Braking [12/2022 - ] >> Procedure

ABS Operates Before Necessary When Braking [12/2022 - ]: Procedure

  1. CHECK VEHICLE 

    Result

    Result Proceed to
    for 2WD A
    for AWD B

    Result: 

    See step  3

    Result: 

    See step  2

  2. PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CIRCUIT) 
    1. Using the GTS, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

      Refer to SIGNAL CHECK [12/2022 - ]

      Chassis > Brake/EPB > Utility 

      Tester Display
      Signal Check

      OK

      Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

      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.

      HINT: 

      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.

      Result

      Result Proceed to
      OK (for Front) A
      OK (for Rear) B
      NG C

    Result: 

    CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR 

    Result: 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY. Refer to  REMOVAL [12/2022 - 03/2023]  , or refer to  REMOVAL [03/2023 - ] 

    Result: 

    INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT 

  3. PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CIRCUIT) 
    1. Using the GTS, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

      Refer to SIGNAL CHECK [12/2022 - ]

      Chassis > Brake/EPB > Utility 

      Tester Display
      Signal Check

      OK

      Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

      NOTE:
      • When cleaning the front speed sensor and rear speed sensor, make sure to clean the installation hole before installation.
      • Do not use parts cleaner when cleaning the front speed sensor rotor and rear speed sensor rotor.

      Result

      Result Proceed to
      OK (for Front) A
      OK (for Rear) B
      NG C

    Result: 

    CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR 

    Result: 

    CLEAN REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR 

    Result: 

    INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT