TRAC does not Operate [12/2019 - ]: Procedure

1. Check if the slip indicator light was illuminated when TRAC did not operate.

   OK

   The slip indicator light was illuminated.

   HINT: 

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

2. Check the operation condition of the VSC OFF switch when TRAC did not operate.

   OK

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

   HINT: 

   When the multi-information display in the combination meter assembly displays "Traction Control Turned Off", TRAC does not operate.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

See step  2

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

   Chassis > Brake/EPB > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output.	A
   Electronically controlled brake system DTCs are output.	B

Result: 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

Result: 

A 

See step  3

1. Operate the VSC OFF switch and check that the multi-information display in the combination meter assembly displays "Traction Control Turned Off" 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 "Traction Control Turned Off" and the VSC OFF indicator light illuminates in accordance with the operation of the switch.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSPECT VSC OFF SWITCH. Refer to  VSC OFF Switch Circuit [12/2019 - 10/2022]  , or refer to  VSC OFF Switch Circuit [10/2022 - ]  

Result: 

OK 

See step  4

1. 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.

   Refer to TEST MODE PROCEDURE [12/2019 - 11/2023] , or refer to TEST MODE PROCEDURE [11/2023 - ]

   Chassis > Brake/EPB > Utility 

   Tester Display
   Signal Check

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT 

Result: 

OK 

See step  5

1. Operate the VSC OFF switch and check that the system is not in TRAC off mode or VSC off mode.
2. Check that no DTCs are output and that each warning light is not illuminated.
3. Start off the vehicle on a low friction surface and check that TRAC operates when attempting to make the drive wheels slip.

   OK

   TRAC operates when slip occurs when starting off.

   NOTE:

   • Even when the system is normal, VSC may not operate when the vehicle speed is low or 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 TRAC operated or not can be checked by reading the Vehicle Control History (RoB) when the system operated.

     Refer to VEHICLE CONTROL HISTORY [12/2019 - 10/2022] , or refer to VEHICLE CONTROL HISTORY [10/2022 - 11/2023] , or refer to VEHICLE CONTROL HISTORY [11/2023 - ]

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ]