Sfi System Brake Override System

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT

READ VALUE USING GTS (MASTER CYLINDER SENSOR)

READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)

INSPECT BRAKE PEDAL SUPPORT ASSEMBLY

READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)

READ VALUE USING GTS (VEHICLE SPEED)

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

DESCRIPTION

1. Activation Conditions:
   
   1. When the accelerator pedal and brake pedal are 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. When the vehicle speed is extremely low, the accelerator opening value used when controlling the engine is reduced more than normal.
      

      HINT:

      During control, the Accelerator Position value in the Data List will be lower than normal.

   2. When the vehicle speed is not extremely low, the accelerator opening value is forcibly lowered to a fixed value.
      

      HINT:

      1. 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 %).
         

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

INSPECTION PROCEDURE

1. 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.

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 (LandCruiser RM000000VNO00GX.html).
   
2. 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).
   

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. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Enter the following menus: Utility / All Codes.
   

4. Check DTCs.
   

   Result

   Result	Proceed to
   No DTC output	A
   DTC output	B

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Start the engine.
   

4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List / Master Cylinder Sensor.
   

5. Read the value displayed on the GTS.
   
   

   GTS Display	Measurement Item/Range	Normal Condition
   Master Cylinder Sensor	Master cylinder pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V	Brake pedal released: 0.30 to 0.90 V Reading increases when brake pedal is depressed

6. 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.
   

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch and ST1.
   

4. 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

1. Inspect and adjust the brake pedal assembly (LandCruiser RM000002W8X06QX.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 support assembly and stop light switch assembly.

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.
   

4. 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 %

   HINT:

   For numerical values of Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %, refer to the Data List (LandCruiser RM000000VNO00GX.html).

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Start the engine.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.
   

5. 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

   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.

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON and turn the GTS on.
   

3. Start the engine.
   

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

5. 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.

   HINT:

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