Tip: To find the fault code quickly, you can pay attention to the official WeChat account and reply to the fault code, such as "P240 1", and then you can get the corresponding fault code explanation and solution.
Background: Evaporative emission (EVAP) system introduces gasoline vapor from fuel tank to storage tank filled with activated carbon, which can absorb gasoline vapor. Then, the engine will use fresh air to blow these gasoline vapors into the engine combustion chamber. The function of the leak diagnosis module is to apply less pressure to the evaporative emission (EVAP) system and the fuel system by using the leak detection pump (LDP), and then detect whether there is a leak in the system to ensure that no harmful steam escapes into the atmosphere.
When your car breaks down, you need to clear the fault code. When clearing the fault code, it must be carried out in strict accordance with the fault code clearing method specified by the specific vehicle model, and it is not allowed to remove the negative connection of the battery at will to clear the fault code. Otherwise, it is likely to cause the following two problems: First, the control computers of some models lose their "history". We know that some models of control computers have automatic memory function. If the connecting wire of the negative electrode of the battery is removed, the running data of the engine stored in RAM will be lost, which will make the performance of the car poor for a long time after maintenance or reproduce the cleared fault code after driving for a period of time; On the other hand, some functions may be lost. For example, the function of audio lock is one of the common situations. In this case, you must repair the audio separately. If you do this, you will lose the watermelon.