SFI SYSTEM (w/ Secondary Air Injection System) 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.

A01J4BSE01
Activation Conditions:

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:

Tech Tips

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 Throttle Sensor 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:

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, 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.

Tech Tips


  • Under normal conditions, the Throttle Sensor 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 Throttle Sensor Position and Accel Sens. No. 1 Volt % do not match, and the value of Throttle Sensor 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 ignition switch to ON and turn the intelligent tester on.

    3. Enter the following menus: Utility / All Codes.

    4. Check DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC output B

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester on.

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

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

      OK
      Intelligent 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

    NG
    OK
  3. INSPECT BRAKE PEDAL


    1. Inspect and adjust the brake pedal Click here.

      Tech Tips

      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.


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester.

      OK
      Intelligent 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 %

      Tech Tips

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


    NG
    OK
  5. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester.

      Standard
      Intelligent Tester 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.

      Tech Tips

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


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON 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.

    5. Read the value displayed on the intelligent tester.

      Standard
      Intelligent 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 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.

      Tech Tips

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


    NG
    OK