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.

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PROCEDURE

(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

(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.

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

(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

(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.

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Chassis > Brake/EPB > Utility

OK:

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

NG

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT

OK

(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.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE BRAKE ACTUATOR ASSEMBLY