DESCRIPTION
INSPECTION PROCEDURE
CHECK DTC OUTPUT
READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)
INSPECT BRAKE PEDAL
READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)
READ VALUE USING GTS (VEHICLE SPEED)
READ VALUE USING GTS (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.
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.
- 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:
Driving torque is restricted.
- When this control is activated, the accelerator opening value is forcibly reduced to a fixed value. Therefore, the Accelerator Position value in the Data List is fixed regardless of the actual accelerator opening value (Accel Sens.No.1 Volt%).
Deactivation Conditions:
When the Stop Light Switch turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.
INSPECTION PROCEDURE
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, and then the brake override system has been activated.
- 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.
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 ().
If the Accelerator Position and Accel Sens.No.1 Volt% values in the Data List 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 intelligent tester data saving function to record data while driving the vehicle, and then confirm it after driving is completed).
- 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.
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 DTCs.
Result| Result | Proceed to |
| No DTC output | A |
| DTC output | B |
| 2.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 / Stop Light Switch and ST1.
Check the Data List indication when the brake pedal is depressed and released.
- OK:
| GTS Display | Condition | Specified Condition |
| Stop Light Switch | Brake pedal released | OFF |
| Brake pedal depressed | ON |
| ST1 | Brake pedal released | OFF |
| Brake pedal depressed | ON |
| | INSPECT STOP LIGHT SWITCH ASSEMBLY ()
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Inspect and adjust the brake pedal (for LHD) ().
Inspect and adjust the brake pedal (for RHD) ().
- 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| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPAIR OR REPLACE BRAKE PEDAL ()
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| | REPAIR OR REPLACE BRAKE PEDAL ()
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| 4.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 / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.
Read the value displayed on the GTS.
- OK:
| 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 % |
- For numerical values of Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %, refer to the Data List ().
| | REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY ()
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| 5.READ VALUE USING GTS (VEHICLE SPEED) |
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 / 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 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 |
- When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| | GO TO VEHICLE SPEED SENSOR "A" ()
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| 6.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.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List / 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 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 |
- When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| | INSPECT FRONT OR REAR SPEED SENSOR |
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