СИСТЕМА SFI Brake Override System

Информация добавлена 08-08-2017

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.

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 speed.

Items Controlled:
- Driving torque is restricted.
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 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 %).

Deactivation Conditions:
- When the stop light switch assembly turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.

CAUTION / NOTICE / HINT

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.

Tech Tips

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 drive 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

CHECK DTC OUTPUT

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Enter the following menus: System Select / Health Check.

Check the DTCs.

Result

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

GO TO DTC CHART

READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Ptrl Throttle / Stop Light Switch and ST1.

Powertrain > Engine and ECT > Data List

Tester Display

Stop Light Switch

Tester Display
Stop Light Switch

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

GTS Display	Condition	Specified Condition
Stop Light Switch	Brake pedal released	OFF
Stop Light Switch	Brake pedal depressed	ON
ST1	Brake pedal released	OFF
ST1	Brake pedal depressed	ON

Result

Proceed to
OK
NG

INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

INSPECT BRAKE PEDAL SUPPORT ASSEMBLY

Inspect and adjust the brake pedal support assembly.

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, so conduct inspection of the brake pedal support assembly and stop light switch assembly.

Result

Proceed to
OK
NG

REPAIR OR REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Ptrl Throttle / 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 %

Read the value displayed on the GTS.

GTS 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 %	Accelerator PedalReleased → Depressed → Released

Tech Tips

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

Click here

Result

Proceed to
OK
NG

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

READ VALUE USING GTS (VEHICLE SPEED)

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Start the engine.
Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Vehicle Speed.

Powertrain > Engine and ECT > Data List

Tester Display

Vehicle Speed

Tester Display
Vehicle Speed

Read the value displayed on the GTS.

Standard

GTS Display	Condition	Specified Condition
Vehicle Speed	Vehicle stopped, engine running	0 km/h (0 mph)
Vehicle Speed	Vehicle being driven 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.

Tech Tips

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

Result

Proceed to
OK
NG

GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) Click here

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

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Start the engine.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List / All Data / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

Read the value displayed on the GTS.

Standard

GTS 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 being driven 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.

Tech Tips

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

Result

Proceed to
OK
NG

END

INSPECT FRONT OR REAR SPEED SENSOR