What should I do if the Audi A6LEPC fault light is on?

This kind of fault needs to check the use of P-block locking device and brake switch; Epc light is mainly caused by dirty throttle body. This situation can be solved by cleaning the throttle body and then re-matching.

Another possibility is that the throttle electronic control unit is damaged, the engine control harness is damaged, the accelerator pedal position sensor is faulty, the crankcase ventilation system leaks, the air intake system leaks, the brake light switch is faulty, and the brake light bulb is ablated, which will also cause the epc light to light up. However, the most common thing is that the alarm light is turned on due to the failure of the throttle body and the brake light switch.

Extended data:

Special purpose vehicle detector.

At the end of 1970s, in order to further improve the convenience of modern automobile use and maintenance, a kind of automobile detector specially used to detect the working condition of automobile electronic control system appeared. For example, EEC-I and EEC-II detectors developed by Ford Company in the United States can be used to monitor the signals of electronically controlled gasoline engines and find out the fault parts. Because this kind of special detector has high technical requirements for operators when diagnosing faults, it has not been popularized.

On-board diagnostic system.

In 1980s, a new diagnostic system-on-board diagnostic system came out. It uses the microprocessor control unit to detect and diagnose the components of the electronic control system and find out the faults by itself, so it is also called fault self-diagnosis system.

It is widely used because it can continuously monitor the parameters of automobile electronic control system, record the intermittent faults of standby system, and find faults timely and conveniently. However, due to the limited memory of the microprocessor, its diagnostic items are limited to some extent, and it is impossible to diagnose more complex faults, so people are developing and developing newer and better diagnostic systems.

Multifunctional external diagnostic system.

In order to expand the diagnostic ability and function of on-board self-diagnosis system, OASIS Diaqmonitor diagnostic system and Consult, two external diagnostic instruments, were born in the late 1980s. These systems have complete functions, but they are expensive, with high professional and technical requirements, and their standards are not uniform, and their use and maintenance are also restricted. After entering the 1990s, some multifunctional diagnostic systems which meet international standards, are easy to operate and reasonable in price have been successfully developed. For example, the DOT-2 1 OBD system developed by Daihatsu, Japan, and so on.

Modern automobile self-diagnosis system is self-contained, which is not universal, which is not conducive to popularization and has caused great difficulties for automobile after-sales service and maintenance. Therefore, it is necessary to standardize the diagnosis system so that its diagnosis mode and diagnosis interface can be unified, and all kinds of vehicles can be diagnosed and detected with only one instrument, which will greatly promote the development of automobile self-diagnosis system.

References:

Automobile Fault Diagnosis System-Baidu Encyclopedia