Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000YSRQ |
Model Year Start: 2017 |
Model: Sienna |
Prod Date Range: [08/2016 -
] |
Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: Brake Override System; 2017 - 2020 MY Sienna [08/2016 - ] |
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:
Items Controlled:
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.
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
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: System Select / Health Check.
(d) Check the DTCs.
Result
|
Proceed to
|
DTCs are not output
|
A
|
DTCs are output
|
B
|
B |
|
GO TO DTC CHART
|
A
|
|
|
2.
|
READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE)
|
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List / Master Cylinder Pressure.
(d) Read the value displayed on the Techstream.
Standard:
0 to 1.76 MPa (Brake pedal released).
(e) Check that the brake fluid pressure value of the "Master Cylinder Pressure" observed on the Techstream changes when the brake pedal is depressed.
OK:
When the pedal is depressed, the pressure displayed on the Techstream increases.
OK
|
|
|
3.
|
READ VALUE USING TECHSTREAM (STOP LIGHT SW)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Data List / Stop Light SW.
(d) Check the Data List indication when the brake pedal is depressed and released.
OK:
Techstream Display
|
Condition
|
Specified Condition
|
Stop Light SW
|
Brake pedal released
|
OFF
|
Brake pedal depressed
|
ON
|
OK
|
|
|
4.
|
INSPECT BRAKE PEDAL SUB-ASSEMBLY
|
(a) Inspect and adjust the brake pedal sub-assembly.
Click here
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 sub-assembly and stop light switch assembly.
OK
|
|
|
5.
|
READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %.
(d) Read the value displayed on the Techstream.
OK:
Techstream Display
|
Condition
|
Specified Condition
|
Accelerator Position Sensor No.1 Voltage %
|
Accelerator Pedal Released → Depressed → Released
|
Values smoothly change following accelerator pedal operation
|
Accelerator Position Sensor No.2 Voltage %
|
HINT:
For numerical values of Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %, refer to the Data List.
Click here
OK
|
|
|
6.
|
READ VALUE USING TECHSTREAM (VEHICLE SPEED)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.
(e) Read the value displayed on the Techstream.
Standard:
Techstream Display
|
Condition
|
Specified Condition
|
Vehicle Speed
|
Vehicle stopped, engine running
|
0 km/h (0 mph)
|
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.
OK
|
|
|
7.
|
READ VALUE USING TECHSTREAM (FR, FL, RR, RL WHEEL SPEED)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.
(e) Read the value displayed on the Techstream.
Standard:
Techstream 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 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.
OK |
|
END
|
NG |
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INSPECT FRONT OR REAR SPEED SENSOR
|
|