Brake System

Component Location





General Description

BTCS ( Brake Traction Control System ) is operated when the value ( Wheel acceleration value + speed difference value ) exceeds the specified value when vehicle speed is lower than the 50 Km/h. The BTCS intalled HECU calculates the disc temperature logically, which is an assumed value, by using the value of Wheel speed, vehicle speed change, CONTROL MODE and BLS SIGNAL. Assumed disc temperature is used to protect DISC overheating, caused by long-time operation, which may cause a decrease in brake efficiency.

DTC Description

If the HECU decides that the disc is over-heated ( above 500 °C (932 °F) ), then it turns the ESC lamp ON and inhibits BTCS operation to protect overheating of the disc. If the calculated temperature becomes lower than specified value ( aprrox. 250 °C ), then the HECU turns the ESC lamp OFF and operates the BTCS again.

DTC Detecting Condition





Component Inspection

1. Ignition "OFF".
2. Ignition "ON"
3. Does warning lamp remain On?
YES
> Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification Of Vehicle Repair" procedure.
NO
> Fault is caused by Faulty HECU or was repaired and HECU memory was not cleared.
> The DTC code can be set by excessive ESC control in normal system status. Go to "Verification Of Vehicle Repair" procedure.

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Are any DTCs present ?
YES
> Go to the applicable troubleshooting procedure.
NO
> System performing to specification at this time.