Traction Control System (Tcs) Operation; Traction Control System (Tcs) Function - Hyundai Tiburon 2003 Workshop Manual

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If HECU determines there's no lock-up in the wheel, HECU cuts voltage to solenoid valve. So voltage is not supplied

to each solenoid valve, brake fluid passes through the inlet valve to wheel cylinder, resulting in pressure increase.

TRACTION CONTROL SYSTEM (TCS) OPERATION

1. NORMAL MODE

Solenoid valve

• In the normal driving condition, TC valve (normally open) is the passage between the master cylinder and the each

wheel cylinder.

• When brake pedal is applied, brake pressure is delivered to the wheel cylinders via NO-TC valve and all solenoid

valves inside the hydraulic unit are deactivated.

• In case of TCS malfunction it does not affect brake operation.

2. PRESSURE INCREASE MODE

Solenoid valve

• If a front wheel spin is detected, TCS begins a brake control to decrease a wheel spin.

• Hydraulic shuttle valve (HSV) is opened.

Brake fluid is supplied from the master cylinder by motor operation to the spin wheel via HSV.

• TC valve is closed (ON).

Brake pressure generated from motor pump is delivered only to the front wheel.

• Inlet valve remains open to deliver the brake pressure generated from motor pump to the spinning wheels.

3. PRESSURE DUMP MODE

Solenoid valve

• When the wheel deceleration is under the threshold and the wheel spin is reduced under a slip threshold, applied

brake pressure is reduced to get a optimum traction force.

• Outlet valve is open to release the brake pressure and inlet valve is closed to block the pressure increase from the

• Hydraulic shuttle valve (HSV) remains opened, TC valve is ON.

• Motor is ON, to dump the brake fluid being released from the lock-up wheel.

4. PRESSURE HOLD MODE

Solenoid valve

1. Main performance

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