Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001EABH
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 08/2020]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): TRAC does not Operate; 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]

TRAC does not Operate

DESCRIPTION

When TRC (TRAC) or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred.

When in VSC off mode, or TRC (TRAC) and VSC are disabled, the multi-information display in the combination meter assembly displays "TRC (TRAC) OFF message" and the VSC OFF indicator light illuminates to inform the driver.

When a communication malfunction with the ECM is detected, TRC (TRAC) and VSC are disabled. Also when the system is malfunctioning, TRC (TRAC) and VSC are disabled and the indicator lights of related systems illuminate.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): UTILITY

PROCEDURE

1.

BRAKE PROBLEM CHECK

(a) Check if the slip indicator light was illuminated when TRC (TRAC) did not operate.

OK:

The slip indicator light was illuminated.

HINT:

When a DTC is stored, the slip indicator light is illuminated and TRC (TRAC) does not operate due to the fail-safe function.

(b) Check the operation condition of the VSC OFF switch when TRC (TRAC) did not operate.

OK:

The VSC OFF switch had been operated to turn off TRC (TRAC) when TRC (TRAC) did not operate.

HINT:

When the multi-information display in the combination meter assembly displays "TRC (TRAC) OFF message", TRC (TRAC) does not operate.

OK

END

NG

2.

CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check the DTCs (electronically controlled brake system) that are output.

Result

Proceed to

DTCs are not output.

A

Electronically controlled brake system DTCs are output.

B

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 2019 MY RAV4 RAV4 HV [11/2018 - 10/2019]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): DIAGNOSTIC TROUBLE CODE CHART 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): DIAGNOSTIC TROUBLE CODE CHART

A

3.

CHECK VEHICLE

(a) Operate the VSC OFF switch and check that the multi-information display in the combination meter assembly displays "TRC (TRAC) OFF message" and the VSC OFF indicator light illuminates in accordance with the operation of the switch.

OK:

The multi-information display in the combination meter assembly displays "TRC (TRAC) OFF message" and the VSC OFF indicator light illuminates in accordance with the operation of the switch.

NG

INSPECT VSC OFF SWITCH CIRCUIT

OK

4.

PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.

(d) Using the Techstream, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): TEST MODE PROCEDURE

Chassis > Brake/EPB > Utility

Tester Display

Signal Check

OK:

Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

NG

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT

OK

5.

PERFORM OPERATION CHECK DRIVING

(a) Operate the VSC OFF switch and check that the system is not in TRC (TRAC) off mode or VSC off mode.

(b) Check that no DTCs are output and that each warning light is not illuminated.

(c) Start off the vehicle on a low friction surface and check that TRC (TRAC) operates when attempting to make the drive wheels slip.

OK:

TRC (TRAC) operates when slip occurs when starting off.

NOTICE:

  • Even when the system is normal, VSC may not operate when the vehicle speed is low or TRC (TRAC) may not operate due to a malfunction. Make sure that only the drive wheels slip during the procedure.
  • When confirming that the slip indicator light blinks, do not slip the drive wheels longer than necessary. Whether TRC (TRAC) operated or not can be checked by reading the Vehicle Control History when the system operated.

    w/ Occupant Classification System: Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): VEHICLE CONTROL HISTORY 2019 - 2020 MY RAV4 RAV4 HV [02/2019 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): VEHICLE CONTROL HISTORY

    w/o Occupant Classification System: Click here 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/o Occupant Classification System): VEHICLE CONTROL HISTORY

  • Pay attention to your surroundings when performing the procedure and depress the accelerator pedal with caution.
OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE BRAKE ACTUATOR ASSEMBLY 2019 MY RAV4 RAV4 HV [11/2018 - 10/2019]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (w/ Vacuum Brake Booster): REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (w/ Vacuum Brake Booster): REMOVAL