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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 61 (Hybrid Control System (2WD) - Diagnostic Codes (7 Of 7) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for 2WD) >> Brake Override System [12/2019 - 10/2022] >> Procedure

Brake Override System [12/2019 - 10/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. According to the display on the GTS, select "Health Check".
    2. Check for DTCs.

      Result

      Result Proceed to
      No DTCs are output A
      DTCs are output B
    3. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (MASTER CYLINDER CONTROL TORQUE) 
    1. Turn the ignition switch to ON (READY).
    2. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Master Cylinder Control Torque

      Result

      Result Proceed to
      Display changes according to brake pedal depression force A
      Display does not change according to brake pedal depression force B
    3. Turn the ignition switch off.

    Result: 

    B 

    CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  ON-VEHICLE INSPECTION [12/2019 - ] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %) 

    Refer to ON-VEHICLE INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING GTS (VEHICLE SPEED) 
    1. Turn the ignition switch to ON (READY).
    2. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Vehicle Speed

      Standard

      Inspection Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at a constant speed
      (16 to 64 km/h (10 to 40 mph))      		 No large fluctuations in displayed speed
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT). Refer to  Speed Signal Circuit [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  5

  5. READ VALUE USING GTS (FR, FL, RR, RL WHEEL SPEED) 
    1. Turn the ignition switch to ON (READY).
    2. Read the values displayed on the GTS.

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed

      Standard

      Inspection Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at a constant speed
      (16 to 64 km/h (10 to 40 mph))      		 No large fluctuations in displayed speed
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    INSPECT FRONT OR REAR SPEED SENSOR. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023] 

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