Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001OBBO
Model Year Start: 2020 Model: RAV4 HV Prod Date Range: [06/2020 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): Brake Override System; 2020 - 2024 MY RAV4 HV [06/2020 -        ]

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 hybrid system output. The conditions for activating the brake override system as well as the items that are controlled are explained below.

Activation Conditions:

  • 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.

Items Controlled:

  • Controls hybrid system output

    HINT:

    • When the control is operating, hybrid system output is controlled in accordance with the brake pedal stroke.
    • When the hybrid system output 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.)

Deactivation Conditions:

  • The accelerator pedal or brake pedal is released.

CAUTION / NOTICE / HINT

Inspection Method

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 hybrid system output 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 hybrid system output 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

1.

CHECK DTC OUTPUT (HEALTH CHECK)

(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 for DTCs.

Result

Proceed to

No DTCs are output.

A

DTCs are output.

B

(f) Turn the ignition switch off.

B

GO TO DTC CHART

A

2.

READ VALUE USING TECHSTREAM (MASTER CYLINDER CONTROL TORQUE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (READY).

(c) Turn the Techstream on.

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

Powertrain > Hybrid Control > Data List

Tester Display

Master Cylinder Control Torque

(e) Read the value displayed on the Techstream.

Result

Proceed to

Display changes according to brake pedal depression force

A

Other than above

B

(f) Turn the ignition switch off.

B

CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; BRAKE SYSTEM (OTHER): BRAKE SYSTEM (w/o Vacuum Brake Booster): ON-VEHICLE INSPECTION 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE SYSTEM (OTHER): BRAKE SYSTEM (w/o Vacuum Brake Booster): ON-VEHICLE INSPECTION

A

3.

READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %)

(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 / Hybrid Control / Data List / Accelerator Position Sensor No. 1 Voltage %, Accelerator Position Sensor No. 2 Voltage %.

Powertrain > Hybrid Control > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage %

Accelerator Position Sensor No.2 Voltage %

(e) Read the values displayed on the Techstream.

Standard:

Inspection Condition

Specified Condition

Accelerator pedal fully released → fully depressed

Value (%) changes with accelerator pedal operation

(f) Turn the ignition switch off.

NG

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY

OK

4.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (READY).

(c) Turn the Techstream on.

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

Powertrain > Hybrid Control > Data List

Tester Display

Vehicle Speed

(e) Read the value displayed on the Techstream.

Standard:

Inspection Condition

Specified Condition

Vehicle stopped

0 km/h (0 mph)

Vehicle being driven at a constant speed

(16 to 64 km/h (10 to 40 mph))

No large fluctuations in displayed speed

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 ignition switch off.

NG

GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit 2023 - 2024 MY RAV4 RAV4 HV [10/2022 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit

OK

5.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (READY).

(c) Turn the Techstream on.

(d) 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.

Chassis > ABS/VSC/TRAC > Data List

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

(e) Read the values displayed on the Techstream.

Standard:

Inspection Condition

Specified Condition

Vehicle stopped

0 km/h (0 mph)

Vehicle being driven at a constant speed

(16 to 64 km/h (10 to 40 mph))

No large fluctuations in displayed speed

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 ignition switch off.

OK

END

NG

INSPECT FRONT OR REAR SPEED SENSOR 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): HOW TO PROCEED WITH TROUBLESHOOTING 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): HOW TO PROCEED WITH TROUBLESHOOTING