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HYBRID CONTROL SYSTEM > Brake Override System

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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.

A249391E01

  1. Activation Conditions:
    1. Vehicle is being driven at or above a specified speed.
    2. The accelerator pedal is depressed beyond a specified level, and then the brake pedal is depressed.

    NOTICE:
    Brake override control may not be performed depending on the relationship between accelerator pedal angle and vehicle 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 hybrid control) is forcibly reduced to a specified value. For this reason, the Data List value for Accelerator Degree (the value used for driving torque control) will be replaced with a specified value regardless of the actual accelerator pedal angle (Accel Pedal Pos #1, Accel Pedal Pos #2).

  1. Deactivation Conditions:
    Deactivation occurs when either of the following conditions is met:
    1. The master cylinder pressure decreases below a specified value.
    2. The actual accelerator pedal angle increases or decreases beyond the specified range.

INSPECTION PROCEDURE

  1. Inspection Method
    Drive at 10km/h (6.25mph), depress the accelerator pedal by 1/2 to 3/4 and keep it in that position. Under these conditions, if driving torque is controlled when the brake pedal is depressed by the left foot of the driver, it can be confirmed that the brake override system has operated.

CAUTION:
Perform this road test only in an appropriate safe location, in accordance with all local laws.
Pay careful attention to the surroundings when performing the road test.

HINT:
  1. Under normal conditions, the Accelerator Degree value changes in response to the Accel Pedal Pos #1 value.
  2. If the Data List values of Accelerator Degree and Accel Pedal Pos #1 do not match, and the value of Accel Pedal Pos #1 changes but the value of Accelerator Degree is constant, this confirms that the brake override system has operated. (Data can be captured relatively easily by using the snapshot function in Data List. Confirm the data after performing the road test.)
  3. 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 a loss of power (driving torque) after the accelerator and brake pedals have both been intentionally depressed, explain that this is not a malfunction, and depressing both the accelerator and brake pedals at the same time should be avoided.

1.CHECK DTC OUTPUT (ALL CODES)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

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

  1. Check DTCs.
    Result 
    Result
    		Proceed to
    No DTCs are output.
    		A
    DTCs are output.
    		B

  1. Turn the power switch off.



B
GO TO DTC CHART
A


2.READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER CTRL TRQ)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Master Cylinder Ctrl Trq.

  1. Read the value displayed on the intelligent tester.

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    Master Cylinder Ctrl Trq
    		Master cylinder control torque/
    Min.: -4096 Nm, Max.: 4095 Nm
    		Brake pedal depressed: Changes with the brake pedal pressure
    Brake pedal released: 0 Nm

    Result:
    Result
    		Proceed to
    Displayed value changes according to the brake pedal pressure.
    		A
    Displayed speed value does not change according to the brake pedal pressure.
    		B

  1. Turn the power switch off.



B
CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)
A


3.READ VALUE USING INTELLIGENT TESTER (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2.

  1. Read the value displayed on the intelligent tester.

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    Accel Pedal Pos #1
    		Accelerator pedal position sensor No.1/
    Min.: 0%, Max.: 100%
    		Accelerator pedal released → depressed → released: Changes with accelerator pedal pressure
    Accel Pedal Pos #2
    		Accelerator pedal position sensor No.2/
    Min.: 0%, Max.: 100%

    Result:
    Result
    		Proceed to
    Displayed speed values smoothly changes following accelerator pedal operation.
    		A
    Displayed speed values does not smoothly change following accelerator pedal operation.
    		B

  1. Turn the power switch off.



B
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (Click here)
A


4.READ VALUE USING INTELLIGENT TESTER (VEHICLE SPD)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Vehicle Spd.

  1. Read the value displayed on the intelligent tester.

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    Vehicle Spd
    		Vehicle speed/
    Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)
    		Vehicle stopped: 0 km/h (0 mph)
    No large fluctuations when driving at a constant speed: Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph)

    Result:
    Result
    		Proceed to
    Displayed speed value does not fluctuate.
    		A
    Displayed speed value fluctuates.
    		B

    CAUTION:
    Perform this road test only in an appropriate safe location, in accordance with all local 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.

  1. Turn the power switch off.



B
GO TO METER / GAUGE SYSTEM (Click here)
A


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (READY).

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

  1. Read the value displayed on the intelligent tester.

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    FR Wheel Speed
    		Front speed sensor RH /
    Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Vehicle stopped: 0 km/h (0 mph)
    No large fluctuations when driving at a constant speed: Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph)
    FL Wheel Speed
    		Front speed sensor LH /
    Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    RR Wheel Speed
    		Rear speed sensor RH /
    Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    RL Wheel Speed
    		Rear speed sensor LH /
    Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)

    Result:
    Result
    		Proceed to
    Displayed speed value does not fluctuate.
    		A
    Displayed speed value fluctuates.
    		B

    CAUTION:
    Perform this road test only in an appropriate safe location, in accordance with all local 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.

  1. Turn the power switch off.



B
INSPECT FRONT OR REAR SPEED SENSOR
A

END