SFI SYSTEM(w/ EGR System) Brake Override System

DTC Code DTC Name
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.

A232420E13

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 (applied to electronic throttle control) 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 turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.

INSPECTION PROCEDURE

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, and 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 the 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 driving 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 intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

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

    4. Check DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      No DTC output

      A

      DTC output

      B
    B

    GO TO DTC CHART

    Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH AND ST1)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Enter the following menus: Powertrain / Engine / Data List / Stop Light Switch and ST1.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Stop Light Switch

      ST1

    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

      ST1

      Brake pedal released

      OFF

      Brake pedal depressed

      ON

      Result

      Result

      OK

      NG
    NG

    INSPECT STOP LAMP SWITCH ASSEMBLY

    Click here

    OK

  3. 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

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE BRAKE PEDAL

    Click here

    OK

  4. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Enter the following menus: Powertrain / Engine / Data List / 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 intelligent tester.

      OK

      Tester Display

      Condition

      Specified Condition

      Accel Sens. No. 1 Volt %

      Accelerator PedalReleased → 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

      Result

      Result

      OK

      NG
    NG

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

    Click here

    OK

  5. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Start the engine.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Vehicle Speed

    5. Read the value displayed on the intelligent 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

      Result

      OK

      NG
    NG

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT)

    Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (FR, FL, RR, RL WHEEL SPEED)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester 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 intelligent 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

      Result

      OK

      NG
    OK

    END

    NG

    INSPECT FRONT OR REAR SPEED SENSOR