Brake Override System 1GR-FE

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT

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

INSPECT BRAKE PEDAL

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

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

SFI 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.

SFI system - Brake Override System Land Cruiser 1GR-FE
  1. Activation Conditions:
    1. Vehicle is running at or above the specified speed.
    2. The accelerator pedal is depressed beyond a specified level, and then the brake pedal is depressed.

    NOTICE:

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

  1. Items Controlled:
    1. Driving torque is restricted.

    HINT:

    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 %)

  1. Deactivation Conditions:
    1. When the Stop Light Switch turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.

Inspection procedure

  1. 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.

HINT:

  1. 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 .
  2. 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.)

NOTICE:

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.

1.CHECK DTC OUTPUT

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

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

  1. Check DTCs.

    Result
    Result Proceed to
    No DTC output A
    DTC output B
  B  
GO TO DTC CHART
 
A  
   

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

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

  1. 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
  NG  
INSPECT STOP LIGHT SWITCH ASSEMBLY
 
OK  
   

3.INSPECT BRAKE PEDAL

  1. Inspect and adjust the brake pedal (for LHD) .

  1. Inspect and adjust the brake pedal (for RHD)

    HINT:

    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 A
    NG (for LHD) B
    NG (for RHD) C
  B  
REPAIR OR REPLACE BRAKE PEDAL
 
  C  
REPAIR OR REPLACE BRAKE PEDAL
 
A  
   

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

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

  1. 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 %

    HINT:

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

  NG  
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY
 
OK  
   

5.READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Start the engine.

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

  1. 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.

    HINT:

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

  NG  
GO TO VEHICLE SPEED SENSOR "A"
 
OK  
   

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Start the engine.

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

  1. 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.

    HINT:

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

  NG  
INSPECT FRONT OR REAR SPEED SENSOR
 
OK  
   
END