Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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.

• The accelerator pedal and brake pedal are depressed at the same time.

  NOTICE:

  Brake override control may not be performed depending on the relationship between accelerator opening and vehicle speed.

• Controls driving torque

  HINT:

  • When the control is operating, requested accelerator torque is controlled in accordance with the brake pedal stroke.
  • When the driving torque is reduced to a specified level because the accelerator pedal and brake pedal are depressed at the same time, an indicator is displayed on the meter. (Operation of the system can be confirmed when the indicator is displayed on the meter.)

• The accelerator pedal or brake pedal is released.

CAUTION / NOTICE / HINT

Drive at 10 km/h (6 mph), 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:

The brake override system restricts requested accelerator torque if the brake pedal is depressed when driving with the accelerator pedal depressed. If a customer reports experiencing a loss of power (requested accelerator 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

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Check for DTCs.

(f) Turn the power switch off.

B

GO TO DTC CHART

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Master Cylinder Control Torque.

(e) Read the value displayed on the Techstream.

(f) Turn the power switch off.

B

CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Accelerator Position Sensor No. 1 Voltage %, Accelerator Position Sensor No. 2 Voltage %.

(e) Read the values displayed on the Techstream.

Standard:

(f) Turn the power switch off.

NG

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

OK

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Vehicle Speed.

(e) Read the value displayed on the Techstream.

Standard:

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.

(f) Turn the power switch off.

NG

GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT)

OK

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(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 values displayed on the Techstream.

Standard:

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.

(f) Turn the power switch off.

OK

END

NG

INSPECT FRONT OR REAR SPEED SENSOR