СИСТЕМА ECD Brake Override System

DESCRIPTION

When the vehicle is being driven with the accelerator pedal depressed, depressing the brake pedal without releasing the accelerator pedal will activate the brake override system to restrict driving torque. The conditions for activating the brake override system as well as the items that are controlled are explained below.

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  • Activation Conditions:
    • Vehicle is running at or above the specified speed.

    • The accelerator pedal is depressed beyond a specified level, and then the brake pedal is depressed.

    Note:

    The vehicle may not enter the brake override system control due to the relation of the accelerator pedal angle and the vehicle's speed.

  • Items Controlled:
    • Driving torque is restricted.

    Tip:

    During brake override system control, the value for the accelerator pedal angle (which is used for engine control) is forcibly reduced to a specified value. For this reason, the Data List value for Accelerator Position will be replaced with a specified value regardless of the actual accelerator pedal angle (Accel Sens. No. 1 Volt %, Accel Sens. No. 2 Volt %)

  • Deactivation Conditions:
    • When the stop light switch assembly turns off or the actual accelerator pedal angle increases or decreases beyond the specified range.

CAUTION / NOTICE / HINT

  • Inspection Method

    Example:

    Drive at 10 km/h (6.25 mph), depress the accelerator pedal by 1/2 to 3/4 and keep it in that position. Under these conditions, if the engine speed decreases to 1000 rpm when the brake pedal is depressed, then the brake override system has been activated.

ОСТОРОЖНО

When carrying out the inspection, use a place where you are able to carry it out safely and also pay close attention to your surroundings.

Also, when driving make absolutely sure that all road traffic laws, such as speed limits, are observed.

Tip:
  • Under normal conditions, the Accelerator Position value changes in response to the Accel Sens. No. 1 Volt % value. For more information on the numerical values, refer to the Data List.

    Click hereНажмите здесь

  • If the Data List values of Accelerator Position and Accel Sens. No. 1 Volt % do not match, and the value of Accelerator Position changes but the value of Accel Sens. No. 1 Volt % is constant, this confirms that brake override system has activated. (Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.)

Note:

The brake override system restricts driving torque if the brake pedal is depressed when driving with the accelerator pedal depressed. If a customer reports experiencing loss of torque after the accelerator and brake pedals have both been intentionally depressed, explain to the customer that this is not a malfunction, and that the customer should avoid depressing both the accelerator and brake pedals at the same time.

Example: While operating the accelerator pedal, the customer uses their left foot to operate the brake pedal.

PROCEDURE

  1. CHECK DTC OUTPUT

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: System Select / Health Check.

    4. Check the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTCs are output B
    B

    GO TO DTC CHART


    A
  2. READ VALUE USING GTS (STOP LIGHT SWITCH)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Stop Light Switch.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Stop Light Switch
    4. Check the Data List indication when the brake pedal is depressed and released.

      OK
      GTS Display Condition Specified Condition
      Stop Light Switch Brake pedal released OFF
      Brake pedal depressed ON
      Result
      Proceed to
      OK
      NG
    NG

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click hereНажмите здесь


    OK
  3. INSPECT BRAKE PEDAL SUB-ASSEMBLY

    1. Inspect and adjust the brake pedal sub-assembly.

      Click here Нажмите здесь

      Tip:

      If the stop light switch assembly turns on too late, the start of brake override system control may be delayed; if it turns ON too soon, brake override system control may begin too early, so conduct inspection of the brake pedal sub-assembly and stop light switch assembly.

      Result
      Proceed to
      OK
      NG
    NG

    REPAIR OR REPLACE BRAKE PEDAL SUB-ASSEMBLY Click here Нажмите здесь


    OK
  4. READ VALUE USING GTS (ACCELERATOR PEDAL SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Accel Sens. No.1 Volt %
      Accel Sens. No.2 Volt %
    4. Read the value displayed on the GTS.

      OK
      GTS Display Condition Specified Condition
      Accel Sens. No. 1 Volt %

      Accelerator Pedal

      Released → Depressed → Released

      Values smoothly change following accelerator pedal operation
      Accel Sens. No. 2 Volt %
      Tip:

      For numerical values of Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %, refer to the Data List.

      Click hereНажмите здесь

      Result
      Proceed to
      OK
      NG
    NG

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click hereНажмите здесь


    OK
  5. READ VALUE USING GTS (VEHICLE SPEED)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Vehicle Speed.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Vehicle Speed
    5. Read the value displayed on the GTS.

      Standard
      GTS Display Condition Specified Condition
      Vehicle Speed Vehicle stopped, engine running 0 km/h (0 mph)
      Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph) No large fluctuations when driving at a constant speed

      ОСТОРОЖНО

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tip:

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

      Result
      Proceed to
      OK
      NG
    NG

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) Click here Нажмите здесь


    OK
  6. READ VALUE USING GTS (FR, FL, RR, RL WHEEL SPEED)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed
    5. Read the value displayed on the GTS.

      Standard
      GTS Display Condition Specified Condition

      FR Wheel Speed

      FL Wheel Speed

      RR Wheel Speed

      RL Wheel Speed

      Vehicle stopped, engine running 0 km/h (0 mph)
      Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph) No large fluctuations when driving at a constant speed

      ОСТОРОЖНО

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tip:

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

      Result
      Proceed to
      OK
      NG
    OK

    END


    NG

    INSPECT FRONT OR REAR SPEED SENSOR