ECD SYSTEM(for Swirl Control Valve) 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.

A308494E14

Activation Conditions:

  • When the accelerator pedal and brake pedal are depressed.

Note:

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

Items Controlled:

  • When the vehicle speed is extremely low, the accelerator opening value used when controlling the engine is reduced more than normal.

Tip:

During control, the Accelerator Position value in the Data List becomes smaller.

  • When the vehicle speed is not extremely low, the accelerator opening value is forcibly lowered to a fixed value.

Tip:

During control, the Accelerator Position value in the Data List is forcibly reduced to a specified value regardless of the actual accelerator opening value (Accel Sens. No.1 Volt %).

Deactivation Conditions:

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

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, 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 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 Accelerator Position in the Data List and Accel Sens. No.1 Volt % values diverge and the Accelerator Position value in the Data List is fixed even though Accel Sens. No.1 Volt % is changing, check that this control is activated (use the GTS data saving function to record data while driving the vehicle, and then confirm it after driving is completed).

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 DTCs.

      Table 1. Result

      Result

      Proceed to

      No DTC is output

      A

      DTC is output

      B

    GO TO DTC CHART

  2. READ VALUE USING GTS (MASTER CYLINDER SENSOR)

    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/TRAC / Data List / Master Cylinder Sensor.

    5. Read the value displayed on the GTS.

      GTS Display

      Measurement Item/Range

      Normal Condition

      Master Cylinder Sensor

      Master cylinder pressure sensor reading/

      Min.: 0.00 V, Max.: 5.00 V

      • Brake pedal released: 0.30 to 0.90 V

      • Reading increases when brake pedal is depressed

    6. Check that the brake fluid pressure value of the "Master Cylinder Sensor" observed on the GTS changes when the brake pedal is depressed.

      OK

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

    INSPECT BRAKE ACTUATOR ASSEMBLY

  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 and ECT / Data List / 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

    INSPECT STOP LIGHT SWITCH ASSEMBLY

    (Click here)

  4. INSPECT BRAKE PEDAL SUPPORT ASSEMBLY

    1. Inspect and adjust the brake pedal support assembly (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. Therefore, it is necessary to conduct inspection of the brake pedal and stop light switch assembly.

    REPAIR OR REPLACE BRAKE PEDAL

    (Click here)

  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 and ECT / Data List / Accel Sens. No.1 Volt % and 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 here).

    REPLACE ACCELERATOR PEDAL POSITION SENSOR ASSEMBLY

    (Click here)

  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 and ECT / Data List / 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 driven at constant speed between 16.1 and 64.4 km/h (10 and 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 driving test.

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT)

    (Click here)

  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/TRAC / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and 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 driven at constant speed between 16.1 and 64.4 km/h (10 and 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 driving test.

    END

    INSPECT FRONT OR REAR SPEED SENSOR