What happened when the epc light of Audi q7 came on?

The main reasons why epc light is on are:

1, which is caused by dirty throttle body, can only be solved by cleaning the throttle and re-matching.

2. There is also a leak in the air intake system, which causes the engine control unit to light the epc warning light after detecting the problem.

3. If the crankcase ventilation system leaks, it will also lead to this failure.

4. Serious or obvious vacuum leakage is not a problem, only slight leakage cannot be effectively detected by the control unit. If the compensation adjustment made by the control unit exceeds the limit allowed by the internal program of the control unit, the control unit will judge that there is something wrong with the electronic throttle system and the epc fault light will light up.

5, brake light switch failure will also lead to this phenomenon.

The specific fault should be solved according to the actual situation. It's best to go to a professional repair shop for inspection and let professionals carry out maintenance. After all, the safety of vehicles is related to the safety of people's lives and cannot be sloppy.

EPC is the abbreviation of "electronicpowercontrol" in English, which means electronic throttle in Chinese.

The electronic throttle uses a wire harness (wire) instead of a cable or a pull rod, a micro motor is installed on the throttle, and the throttle opening is driven by the motor. The so-called "wire transmission" means replacing the original mechanical transmission mechanism with wire.

Electronic throttle control system is mainly composed of accelerator pedal, pedal displacement sensor, ECU (electronic control unit), data bus, servo motor and throttle actuator.

The displacement sensor is installed in the accelerator pedal to monitor the position of the accelerator pedal at any time. When it is detected that the height position of the accelerator pedal changes, the information will be sent to the ECU instantly. The ECU will calculate and process these information and data information from other systems to calculate a control signal, which will be sent to the servo motor relay through the line. The servo motor drives the accelerator actuator, and the data bus is responsible for the communication between the system ECU and other ECU.

Because the electronic throttle system adjusts the throttle through ECU, it can set various functions to improve the safety and comfort of driving. In the current EFI engine, electronic throttle can further improve the fuel saving and emission performance of the engine, because it controls the door of engine power adjustment.