Volkswagen ccepc explains what a fault is.

After the key door is opened, the EPC indicator light of Volkswagen CC of Pacific Auto Network will start self-checking, and the EPC indicator light will light up for a few seconds and then go out. If the vehicle does not go out after starting, it means that the mechanical and electronic system of the vehicle has failed. Usually the EPC light is on because the throttle is too dirty and needs to be cleaned. Or if the brake light is broken, you need to check the brake switch and wiring.

After the key door of Volkswagen CC is opened, the vehicle starts self-inspection, and the EPC indicator lights up for a few seconds and then goes out. If the vehicle does not go out after starting, it means that the mechanical and electronic system of the vehicle has failed. Generally, the EPC light is on because the throttle valve is too dirty and should be cleaned. Or if the brake light is broken, you need to check the brake switch and wiring.

EPC failure generally refers to the failure of the mechanical and electronic system of the vehicle after the vehicle is started. When the ignition switch is turned on for function check, the indicator EPC will light up. If the indicator lights up while driving, it indicates that the engine power electronic control system is out of order. The engine must be checked immediately. Under normal circumstances, dirty throttle body, vacuum leakage of intake system, broken brake switch and untimely engine upgrade may all lead to EPC failure.

In the past, the driver controlled the accelerator pedal according to the power demand of the engine, and the accelerator pedal controlled the accelerator opening through a steel wire rope. In EPC system, the former accelerator cable is replaced by the sensor of pedal device, and the engine control unit (ECU) calculates the optimal target accelerator opening according to the position data fed back by the sensor of pedal device, and sends a signal to the accelerator drive motor to make the accelerator rotate to this angle.

This method is superior to the cable acceleration control, because the electronic throttle knows the power demand of the engine by calculating and analyzing the input signal of the accelerator pedal position, and converts this information into the torque of the engine through various actuators. When the engine speed needs to be adjusted due to safety, fuel consumption and other reasons, the engine control unit can adjust the position of the throttle valve without using the accelerator pedal. The advantage of this structure is that the control unit can limit the position of the throttle according to various requirements.