Sfi System Brake Override System

Engine Hybrid System. Corolla. Zre142 Aze141
2Zr-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH AND ST1)

INSPECT BRAKE PEDAL

READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

READ VALUE USING TECHSTREAM (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.

Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System.Sfi System Brake Override System

  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 6.25 mph (10 km/h), 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 (COROLLA_ZRE142 RM000000PDN0MHX.html).
  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 Techstream to the DLC3.

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

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

  1. Check DTCs.

    Result:

    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
GO TO DTC CHART
A


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream 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:

    Techstream 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 (COROLLA_ZRE142 RM0000014D9026X.html)
OK


3.INSPECT BRAKE PEDAL

  1. Inspect and adjust the brake pedal (COROLLA_ZRE142 RM000002W8X04UX.html).

    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.


NG
REPAIR OR REPLACE BRAKE PEDAL (COROLLA_ZRE142 RM000002W90056X.html)
OK


4.READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream 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 Techstream.

    OK:

    Techstream 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 (COROLLA_ZRE142 RM000000PDN0MHX.html).


NG
REPLACE ACCELERATOR PEDAL ASSEMBLY (COROLLA_ZRE142 RM000002WT903GX.html)
OK


5.READ VALUE USING TECHSTREAM (VEHICLE SPEED)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream 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 Techstream.

    Standard:

    Techstream Display
    		Condition
    		Specified Condition
    Vehicle Speed
    		Vehicle stopped, engine running
    		0 mph (0 km/h)
    Vehicle running at constant speed between 10 to 40 mph (16.1 to 64.4 km/h)
    		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 METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) (COROLLA_ZRE142 RM000002UD708MX.html)
OK


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

  1. Connect the Techstream to the DLC3.

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

  1. Start the engine.

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

  1. Read the value displayed on the Techstream.

    Standard:

    Techstream Display
    		Condition
    		Specified Condition
    FR Wheel Speed
    FL Wheel Speed
    RR Wheel Speed
    RL Wheel Speed
    		Vehicle stopped, engine running
    		0 mph (0 km/h)
    Vehicle running at constant speed between 10 to 40 mph (16.1 to 64.4 km/h)
    		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