Sfi System (W/O Secondary Air Injection System) Brake Override System

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH AND ST1)

INSPECT BRAKE PEDAL

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

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

DESCRIPTION

1. Activation Conditions:
   
   1. Vehicle is running at or above a 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 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 Throttle Sensor 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 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, 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 traffic laws, such as speed limits, are observed.

HINT:

1. Under normal conditions, the Throttle Sensor 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 (HILUX_TGN26 RM000000SXS078X.html).
   
2. If the Data List values of Throttle Sensor Position and Accel Sens. No. 1 Volt % do not match, and the value of Throttle Sensor 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 driving 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. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the intelligent tester 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:

   
   

   Intelligent Tester 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 (HILUX_TGN26 RM0000010K501HX.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. Therefore, it is necessary to conduct inspection of the brake pedal and stop light switch assembly.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester.
   
   

   OK:

   
   

   Intelligent Tester 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 (HILUX_TGN26 RM000000SXS078X.html).

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester.
   
   

   Standard:

   
   

   Intelligent Tester Display	Condition	Specified Condition
   Vehicle Speed	Vehicle stopped, engine running	0 km/h (0 mph)
   	Vehicle driven at constant speed between 16.1 and 64.4 km/h (10 and 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 driving test.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the intelligent tester 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 intelligent tester.
   
   

   Standard:

   
   

   Intelligent Tester 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 driven at constant speed between 16.1 and 64.4 km/h (10 and 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 driving test.