Brake Override System

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DTC Code	DTC Name
	Brake Override System

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DESCRIPTION

When the vehicle is being driven, depressing the accelerator pedal sensor assembly and brake 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:
- When the accelerator pedal and brake pedal are depressed.
  
  Note:
  The vehicle may not enter the brake override system control due to the relation of the accelerator pedal angle and the vehicle's speed.

Items Controlled:
- When the vehicle speed is extremely low, the accelerator opening value used when controlling the engine is reduced more than normal.
  
  Tip:
  During control, the Accelerator Position value in the Data List will be lower than normal.
- When the vehicle speed is not extremely low, the accelerator opening value is forcibly lowered to a fixed value.
  Tip:
  - During control, the Accelerator Position value in the Data List is forcibly reduced to a specified value regardless of the actual accelerator opening value (Accel Sens. No. 1 Volt %).
  - During brake override system control, the operation indicator is displayed on the meter.

Deactivation Conditions:
- When the brake pedal or the accelerator pedal returns to some degree.

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CAUTION / NOTICE / HINT

Inspection Method
Example:

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.

Tip:

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.

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If the Accelerator Position in the Data List and Accel Sens. No. 1 Volt % values diverge and the Accelerator Position value in the Data List is fixed even though Accel Sens. No. 1 Volt % is changing, check that this control is activated (use the GTS data saving function to record data while driving the vehicle, and then confirm it after driving is completed).

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.

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PROCEDURE

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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 for DTCs.

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

AClick here
B
GO TO DTC CHART

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READ VALUE USING GTS (MASTER CYLINDER SENSOR)

Connect the GTS to the DLC3.
Start the engine and turn the GTS on.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List / Master Cylinder Sensor.
1. Chassis > ABS/VSC/TRC > Data List
  
  Tester Display
  
  Master Cylinder Sensor
Read the value displayed on the GTS.

Standard

0.30 to 0.80 V (Brake pedal released).

Tester Display
Master Cylinder Sensor

Standard
0.30 to 0.80 V (Brake pedal released).

Check that the brake fluid pressure value of the "Master Cylinder Sensor" observed on the GTS changes when the brake pedal is depressed.

OK
When the pedal is depressed, the voltage displayed on the GTS increases.

Result

Proceed to
OK
NG

OKClick here
NG
CHECK BRAKE ACTUATOR ASSEMBLYClick here

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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 / Data List / All Data / Stop Light Switch and ST1.

Powertrain > Engine > Data List

Tester Display
ST1
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

OKClick here
NG
INSPECT STOP LIGHT SWITCH ASSEMBLYClick here

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INSPECT BRAKE PEDAL SUPPORT ASSEMBLY

Inspect and adjust the brake pedal support assembly.

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Tip:

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

OKClick here
NG
REPAIR OR REPLACE BRAKE PEDAL SUPPORT ASSEMBLYClick here

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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 / Data List / All Data / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

Powertrain > Engine > 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 Pedal Released → Depressed → Released	Values smoothly change following accelerator pedal operation
Accel Sens. No.2 Volt %	Accelerator Pedal Released → Depressed → Released

Tip:

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

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Result

Proceed to
OK
NG

OKClick here
NG
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLYClick here

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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 / Data List / All Data / Vehicle Speed.
1. Powertrain > Engine > 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 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 a drive test, obey all speed limits and traffic laws.

Tip:

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

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

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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 / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

Chassis > ABS/VSC/TRC > Data List

Tester Display
FR Wheel Speed
FL Wheel Speed
RR Wheel Speed
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 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.

Tip:

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

OK
END
NG
INSPECT FRONT OR REAR SPEED SENSOR

SFI SYSTEM(w/ Canister Pump Module) Brake Override System