Toyota Tundra (2015 year). Manual — part 1695
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Contro...
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000004G8F0RLX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Brake Override System; 2015 MY Tundra [08/2014
- ]
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.
Activation Conditions:
Vehicle is running at or above the specified speed.
When the accelerator pedal and brake pedal are depressed.
NOTICE:
Items Controlled:
Driving torque is restricted.
HINT:
When this control is activated, the accelerator opening value is forcibly reduced to a fixed value.
Deactivation Conditions:
When the brake pedal or the accelerator pedal returns to some degree.
INSPECTION PROCEDURE
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
.
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 Techstream 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
pedal.
PROCEDURE
1.
CHECK DTC OUTPUT
(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 DTCs.
Result
RESULT
PROCEED TO
No DTC output
A
DTC output
B
B
GO TO DTC CHART
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Brake Overr...
A
OK
2.
READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR)
(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 / Data List / Master Cylinder Sensor.
(e) Read the value displayed on the Techstream.
TESTER 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
OK:
When the pedal is depressed, the voltage displayed on the Techstream increases.
NG
INSPECT BRAKE ACTUATOR ASSEMBLY
3.
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH AND ST1)
(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 and ECT / Data List / Stop Light Switch and
ST1.
(d) Check the Data List indication when the brake pedal is depressed and released.
OK:
TECHSTREAM DISPLAY
CONDITION
SPECIFIED CONDITION
Stop Light Switch
Brake pedal released
OFF
Brake pedal depressed
ON
ST1
Brake pedal released
OFF
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Brake Overr...
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