Brake Override System

FA20 ENGINE CONTROL: SFI SYSTEM: Brake Override System; 2013 MY FR-S [03/2012 -]
- Brake Override System

DESCRIPTION

When the vehicle is being driven with the accelerator pedal depressed, depressing the brake pedal without releasing the accelerator 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.

* The accelerator pedal is depressed, and then the brake pedal is 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
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 Accelerator 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 %)

Deactivation Conditions:

* When the Stop Light Switch turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.

INSPECTION PROCEDURE

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 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 Data List / Active Test.
* If the Data List values of Accelerator Position and Accel Sens. No. 1 Volt % do not match, and the value of Accelerator Position changes but the value of Accel Sens. No. 1 Volt % is constant, this confirms that 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 drive 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.

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

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH AND 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 / Data List / Stop Light Switch and ST1.

(d) Check the Data List indication when the brake pedal is depressed and released.

OK:

NG -- INSPECT STOP LIGHT SWITCH ASSEMBLY Removal
OK -- Continue to next step.

3. INSPECT BRAKE PEDAL

(a) Inspect and adjust the brake pedal (for Manual Transmission) For Manual Transmission.

(b) Inspect and adjust the brake pedal (for Automatic Transmission) For Automatic Transmission.

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 and stop light switch assembly.

Result:

B -- REPAIR OR REPLACE BRAKE PEDAL For Manual Transmission

C -- REPAIR OR REPLACE BRAKE PEDAL Removal
A -- Continue to next step.

4. READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL 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 / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.

(d) Read the value displayed on the Techstream.

OK:

HINT
For numerical values of Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %, refer to the Data List Data List / Active Test.

NG -- REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Removal
OK -- Continue to next step.

5. 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:

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 drive test.

NG -- GO TO METER / GAUGE SYSTEM Meter / Gauge System
OK -- Continue to next step.

6. 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 / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

(e) Read the value displayed on the Techstream.

Standard: