Toyota Yaris: Vehicle Stability Control System / TRC does not Operate

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / TRC does not Operate

DESCRIPTION

When TRC 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 and VSC are disabled, the multi-information display in the combination meter assembly displays TRC OFF message and the VSC OFF indicator light illuminates to inform the driver.

When a communication malfunction with the ECM is detected, TRC and VSC are disabled. Also when the system is malfunctioning, TRC 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 "Calibration".

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PROCEDURE

1.	BRAKE PROBLEM CHECK

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

OK:

The slip indicator light was illuminated.

HINT:

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

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

OK:

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

HINT:

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

END

2.	CHECK VEHICLE

(a) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(b) Check the DTCs that are output.

OK:

DTCs are not output.

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

INSPECT COMBINATION SWITCH ASSEMBLY

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

(a) Using the GTS, 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.

Chassis > Brake > Utility

Tester Display
Signal Check

OK:

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

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT

4.	PERFORM OPERATION CHECK DRIVING

(a) Operate the VSC OFF switch (combination switch assembly) and check that the system is not in TRC 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 operates when attempting to make the drive wheels slip.

OK:

TRC 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 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 operated or not can be checked by reading the Vehicle Control History (RoB) when the system operated.
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Pay attention to your surroundings when performing the procedure and depress the accelerator pedal with caution.

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

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