2ZR-FE ENGINE CONTROL SFI SYSTEM Brake Override System

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.

1.917,2.958 2.844,3.531 0.927,0.573 10 false Vehicle Speed 0.208,3.229 1.563,3.51 1.354,0.281 10 false Wheel Speed Sensor 0.198,2.802 1.604,3.052 1.406,0.25 10 false Vehicle Speed Sensor 0.188,2.177 1.354,2.5 1.167,0.323 10 false Stop Light Switch 0.167,0.448 1.302,1.073 1.135,0.625 10 false Accelerator Pedal Sensor Assembly 0.167,1.313 2.208,1.688 2.042,0.375 10 false Master Cylinder Pressure Sensor (Brake Actuator Assembly)* 2.313,1.427 3.302,1.76 0.99,0.333 10 false Master Cylinder Pressure* 0.792,3.021 0.948,3.323 0.156,0.302 10 false or 3.51,0.552 3.854,0.802 0.344,0.25 10 false ECM 4.917,0.958 6.969,1.583 2.052,0.625 10 false Effective Accelerator Pedal Angle for System Control 1.948,2.302 2.521,2.604 0.573,0.302 10 false ON/OFF 1.625,0.573 2.802,1.146 1.177,0.573 10 false Actual Accelerator Pedal Angle 0.042,0.021 1.594,0.302 1.552,0.281 10 false Brake Override System: 4.688,3.188 5.76,3.385 1.073,0.198 10 false *: w/ VSC

Activation Conditions:

Vehicle is running at or above the specified speed.

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.

Items Controlled:

Driving torque is restricted.

HINT:: 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 brake pedal or the accelerator pedal returns to some degree.

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.

HINT:: ·

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 hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>SFI SYSTEM>DATA LIST / ACTIVE TEST

·

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 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.

PROCEDURE

1.CHECK DTC OUTPUT

Connect the GTS to the DLC3.

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

Enter the following menus: System Select / Health Check.

Check the DTCs.

Result:

Result	Proceed to
DTC is not output (w/ VSC)	A
DTC is not output (w/o VSC)	B
DTCs are output	C

2.READ VALUE USING GTS (MASTER CYLINDER SENSOR)

3.READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)

GO TO DTC CHART

2.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.

Chassis > ABS/VSC/TRC > Data List

Tester Display
Master Cylinder Sensor

50003 105 9

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 0.80 V · Reading increases when brake pedal is depressed

Check that the brake fluid pressure value of the "Maser 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

3.READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)

CHECK BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>ON-VEHICLE INSPECTION

3.READ VALUE USING GTS (STOP LIGHT SWITCH AND ST1)

Connect the GTS to the DLC3.

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

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

Powertrain > Engine and ECT > Data List

Tester Display
Stop Light Switch
ST1

50003 234 117,294

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
Stop Light Switch	Brake pedal depressed	ON
ST1	Brake pedal released	OFF
ST1	Brake pedal depressed	ON

Result:

Proceed to
OK
NG

4.INSPECT BRAKE PEDAL SUB-ASSEMBLY

INSPECT STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>ON-VEHICLE INSPECTION

4.INSPECT BRAKE PEDAL SUB-ASSEMBLY

Inspect and adjust the brake pedal sub-assembly.

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL>ADJUSTMENT

HINT:: If the stop light switch assembly 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 sub-assembly and stop light switch assembly.

Result:

Proceed to
OK
NG

5.READ VALUE USING GTS (ACCELERATOR PEDAL SENSOR)

REPAIR OR REPLACE BRAKE PEDAL SUB-ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL>REMOVAL

5.READ VALUE USING GTS (ACCELERATOR PEDAL SENSOR)

Connect the GTS to the DLC3.

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

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

50003 234 15,16

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 %	Accelerator Pedal Released → Depressed → Released

HINT:: For numerical values of Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %, refer to the Data List.; Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>SFI SYSTEM>DATA LIST / ACTIVE TEST

Result:

Proceed to
OK
NG

6.READ VALUE USING GTS (VEHICLE SPEED)

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ACCELERATOR PEDAL>REMOVAL

6.READ VALUE USING GTS (VEHICLE SPEED)

Connect the GTS to the DLC3.

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

Start the engine.

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

Powertrain > Engine and ECT > Data List

Tester Display
Vehicle Speed

50003 234 10

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 a drive test, 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.

Result:

Proceed to
OK
NG

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

GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT)

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>Speed Signal Circuit

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

Connect the GTS to the DLC3.

Turn the ignition switch to ON 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

50003 105 1,2,3,4

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)
FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel 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 a drive test, 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.

Result:

Proceed to
OK
NG

END

INSPECT FRONT OR REAR SPEED SENSOR