C2227 Excessive Temperature Of Brake Disc - Automotive Repair Guides & Equipment

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 ), 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 ( arrox. 300 °C ), then the HECU turns the ESC lamp OFF and operates the BTCS again.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Internal monitoring

Brake disk over heat

Enable Conditions

When the calculated temperature of disc is higher than predefined value(500°C).

If the calculated temperature drops below 300°C, the controller recovers to normal state.

– When IGN switched OFF, HECU calculate temperature of disc until calculated temperature drops below 80°C by BATT1 power.

Fail Safe

Inhibit the ESP control and allow the ABS/EBD control.

The ESP warning lamp is activated.

COMPONENT INSPECTION

1.	Wait untill the brake disc cool down sufficiently.

2.	Ignition “OFF” & Engine “OFF”.

3.	Ignition “ON” & Engine “OFF”.

4.	Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode

5.	Using a scantool, Clear DTC.

6.	Select “Diagnostic Trouble Codes(DTCs)” mode again.

Are any DTCs present ?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU
	▶ Fault is caused by Faulty HECU or was repaired and HECU memory was not cleared. The DTC code can be set by excessive TCS control in normal system status.

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