Brake switch is connected to brake pedal and transmits brake operating state to ECM.

When the output signal of APS is higher than what driver intended during driving (e.g. short to high voltage line in APS circuit, false signal ), driver depresses brake pedal.

Like this, if driver′s decelerating intension is transmitted to ECM (break pedal depressed)when APS output voltage is high, ECM recognizes APS trouble and Limp Home mode is activated.

At Limp Home mode, engine speed is fixed at 1200RPM and engine power generation is limitted.

Even at Limp home mode, if correct APS signal is detected, Limp Home mode is deactivated.

Brake switch, which monitors proper operation of APS, is devided 1 and 2 for the fidelity of brake switch.