Ask an expert: What is the reason why the car EPC light is on?

Why is the car EPC light on? Please give an expert answer

The reasons why the electronic throttle EPC light is on are as follows:

The engine ECU detects a leak in the intake system and lights the EPC warning light. The actual cause of the EPC light coming on is not a functional problem with the electronic throttle control system itself.

Use a decoder to read the fault code. If it is found that the meaning of fault code 17550 is lower than the limit of the load record value, or fault codes 17550 and 17961 appear at the same time, it means that the height sensor suction pipe pressure signal ratio is unreliable (17961P1553 may be Caused by a failure of the intake air pressure sensor). When checking the electronic throttle body, it was found that the throttle valve was too dirty. It was necessary to clean the throttle valve and perform basic settings 01-04-060. (Applicable to POLO models)

The next step may be EPC component or circuit failure. Traditional electrical inspection methods can be used, and the brake switch cannot be ignored.

Too much engine oil will cause the mixture to be too rich and reduce the cylinder pressure. If the fault light still does not go out, try refreshing the engine control unit.

What is the fault of the epc indicator light always on

The main reasons why the car EPC fault light comes on:

The EPC fault light is always on, which means there is a fault in the engine management system or electronic control, which is often accompanied by problems such as unstable idling of the vehicle or shaking of the engine at cold start. Domestic car owners often cause this failure due to oil quality and dirty environment. You should go to a service station for maintenance as soon as possible. Generally, cleaning the throttle can solve the problem.

The EPC indicator light will illuminate when the ignition switch is turned on for a functional check. If this indicator light comes on while driving, it means that the engine power electronic control system is faulty and the engine must be checked immediately. Common causes of failure include dirty throttle body, vacuum leakage in the intake system, damaged brake switch, and failure to upgrade the engine in time.

There are two possibilities for the EPC light to turn on. One is that the throttle valve is dirty and needs to be cleaned. Another situation is that the brake light does not light up. It is necessary to replace the bulb or check the brake switch and circuit. Oil problems may also cause the EPC fault light to illuminate.

Why is the EPC light on?

EPC=Electronic Power Control (full name: engine electronic stability system), many people also call it electronic throttle.

The system consists of some sensors, controllers and other components. When a sensor fails or senses an abnormal situation, the control system will take corresponding measures according to the set program.

For example: When we are accelerating, the control unit senses that the throttle is open. At this time, due to the failure of the brake light switch itself, the control unit receives a braking signal from a brake light switch. According to the program, the control unit must reduce the fuel injection time and reduce the engine power output. But at this time, the control unit also receives the throttle acceleration request signal, and the computer thinks that the two signals are contradictory to each other. If the control unit cannot accurately determine the cause of the fault, it will first light up the EPC light and alarm to prompt the user to check. From this point of view, the EPC light is somewhat similar to the fault warning light or the engine "CHECK" light that is more common in American cars.

EPC indicator lights are relatively common in Volkswagen vehicles. After opening the key door, the vehicle starts a self-check and the EPC indicator light will light up for a few seconds and then go out. If the vehicle still does not turn off after starting, it means there is a malfunction in the vehicle's mechanical and electronic systems. Generally speaking, there are two possibilities for the EPC light to turn on. First, the throttle valve is dirty and should be cleaned. Another situation is that the brake light does not come on, and the brake switch and wiring need to be checked.

Also due to oil problems, the EPC fault light will also come on.

Generally speaking, if the EPC light of a public car comes on, it means there is a problem with the vehicle. It is recommended to go to the 4S shop for inspection as soon as possible

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