Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GKCA |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Brake Override System; 2020 - 2022 MY Corolla [01/2019 - 09/2022] |
DESCRIPTION
When the vehicle is being driven, depressing the accelerator pedal sensor assembly and brake pedal will activate the brake override system to restrict engine output. 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 engine output 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.
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Check the DTCs.
Result
|
Proceed to
|
DTCs are not output
|
A
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DTCs are output
|
B
|
B |
|
GO TO DTC CHART
|
A
|
|
|
2.
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READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR 1)
|
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / Brake / Data List / Master Cylinder Sensor 1.
Chassis > Brake > Data List
Tester Display
|
Master Cylinder Sensor 1
|
(e) Read the value displayed on the Techstream.
Standard:
-1.00 to 0.00 MPa (Brake pedal released).
(f) Check that the brake fluid pressure value of the "Master Cylinder Sensor 1" 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.
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READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH AND ST1)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch and ST1.
Powertrain > Engine and ECT > Data List
Tester Display
|
ST1
|
Stop Light Switch
|
(e) 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
|
Brake pedal depressed
|
ON
|
OK
|
|
|
4.
|
INSPECT BRAKE PEDAL SUPPORT ASSEMBLY
|
(a) Inspect and adjust the brake pedal support assembly.
Click here
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 support assembly and stop light switch assembly.
OK
|
|
|
5.
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READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / 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 %
|
(e) Read the value displayed on the Techstream.
OK:
Techstream 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.
Click here
OK
|
|
|
6.
|
READ VALUE USING TECHSTREAM (VEHICLE SPEED)
|
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.
Powertrain > Engine and ECT > Data List
Tester Display
|
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 driving 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) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / Brake / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.
Chassis > Brake > Data List
Tester Display
|
FR Wheel Speed
|
FL Wheel Speed
|
RR Wheel Speed
|
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
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