Hybrid Control System

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: Brake Override System
- 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 being driven at or above a specified speed.

* The accelerator pedal is depressed beyond a specified level, and then the brake pedal is depressed.

NOTICE:
Brake override control may not be performed depending on the relationship between accelerator pedal angle and vehicle speed.

Items Controlled:

* Driving torque is restricted.

HINT
During brake override system control, the value for the accelerator pedal angle (which is used for hybrid control) is forcibly reduced to a specified value. For this reason, the Data List value for Accelerator Degree (the value used for driving torque control) will be replaced with a specified value regardless of the actual accelerator pedal angle (Accel Pedal Pos #1, Accel Pedal Pos #2).

Deactivation Conditions:

Deactivation occurs when either of the following conditions is met:

* The master cylinder pressure decreases below a specified value.

* The actual accelerator pedal angle increases or decreases beyond the specified range.

INSPECTION PROCEDURE

Inspection Method

Drive at 6.25mph (10km/h), depress the accelerator pedal by 1/2 to 3/4 and keep it in that position. Under these conditions, if driving torque is controlled when the brake pedal is depressed by the left foot of the driver, it can be confirmed that the brake override system has operated.

CAUTION:
Perform this road test only in an appropriate safe location, in accordance with all local laws.

Pay careful attention to the surroundings when performing the road test.

HINT
* Under normal conditions, the Accelerator Degree value changes in response to the Accel Pedal Pos #1 value.
* If the Data List values of Accelerator Degree and Accel Pedal Pos #1 do not match, and the value of Accel Pedal Pos #1 changes but the value of Accelerator Degree is constant, this confirms that the brake override system has operated. (Data can be captured relatively easily by using the snapshot function in Data List. Confirm the data after performing the road test.)
* 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 a loss of power (driving torque) after the accelerator and brake pedals have both been intentionally depressed, explain that this is not a malfunction, and depressing both the accelerator and brake pedals at the same time should be avoided.

PROCEDURE

1. CHECK DTC OUTPUT (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: System Select / Health Check.

(d) Check DTCs.

Result

(e) Turn the power switch off.

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

2. READ VALUE USING TECHSTREAM (MASTER CYLINDER CTRL TRQ)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Master Cylinder Ctrl Trq.

(d) Read the value displayed on the Techstream.

Result:

(e) Turn the power switch off.

B -- CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Component Tests and General Diagnostics
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2.

(d) Read the value displayed on the Techstream.

Result:

(e) Turn the power switch off.

B -- REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Components
A -- Continue to next step.

4. READ VALUE USING TECHSTREAM (VEHICLE SPD)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Vehicle Spd.

(d) Read the value displayed on the Techstream.

Result:

CAUTION:
Perform this road test only in an appropriate safe location, in accordance with all local 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.

(e) Turn the power switch off.

B -- GO TO METER / GAUGE SYSTEM Speed Signal Circuit
A -- Continue to next step.

5. READ VALUE USING TECHSTREAM (FR, FL, RR, RL WHEEL SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / All Data / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

(d) Read the value displayed on the Techstream.

Result: