ECD SYSTEM Brake Override System

DTC Code DTC Name
Brake Override System

DESCRIPTION

When the vehicle is being driven, depressing the accelerator pedal sensor assembly and brake 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.

A286034E02

Activation Conditions:

  • Vehicle is running at or above the specified speed.

  • When the accelerator pedal and brake pedal are 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 brake pedal or the accelerator pedal returns to some degree.

CAUTION / NOTICE / HINT

Inspection Method

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.

CAUTION:

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 here).

  • 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: Utility / All Codes.

    4. Check DTCs.

      Result

      Proceed to

      No DTC is output

      DTC is output
    DTC is output

    GO TO DTC CHART

    Click here

    No DTC is output

  2. READ VALUE USING GTS (MASTER CYLINDER PRESSURE)

    1. Connect the GTS to the DLC3.

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

    3. Enter the following menus: Chassis / ABS/VSC/TRC / Data List / Master Cylinder Pressure.

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Master Cylinder Pressure

    4. Read the value displayed on the GTS.

      GTS Display

      Measurement Item/Range

      Normal Condition

      Master Cylinder Pressure

      Master cylinder pressure sensor reading/

      Min.: 0.00 MPa, Max.: 23.28 MPa

      • Brake pedal released: 0.00 to 1.76 MPa

      • Reading increases when brake pedal is depressed

    5. Check that the brake fluid pressure value of the "Maser Cylinder Pressure" observed on the GTS changes when the brake pedal is depressed.

      OK

      When the pedal is depressed, the pressure displayed on the GTS increases.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK BRAKE ACTUATOR ASSEMBLY

    OK

  3. 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 / Data List / Stop Light Switch.

      Powertrain > Engine > Data List

      Tester Display

      Stop Light Switch

    4. Check the Data List indication when the brake pedal is depressed and released.

      OK

      Tester 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 here

    OK

  4. INSPECT BRAKE PEDAL

    1. Inspect and adjust the brake pedal.

      Click here

      Tip:

      If the stop light switch 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 and stop light switch assembly.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE BRAKE PEDAL

    Click here

    OK

  5. READ VALUE USING GTS (ACCELERATOR PEDAL POSITION 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 / Data List / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.

      Powertrain > Engine > Data List

      Tester Display

      Accel Sens. No.1 Volt %

      Accel Sens. No.2 Volt %

    4. Read the value displayed on the tester.

      OK

      Tester 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 (See page XX-XX).

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

    Click here

    OK

  6. 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 / Data List / Vehicle Speed.

      Powertrain > Engine > Data List

      Tester Display

      Vehicle Speed

    5. Read the value displayed on the tester.

      Standard

      Tester 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
      CAUTION:

      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 hereClick here

    OK

  7. 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 tester.

      Standard

      Tester 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
      CAUTION:

      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