Passat throttle fault warning light

The EPC fault light is always on, indicating that the throttle valve is dirty and the user needs to clean it.

When accelerating, the electronic 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 the brake signal from the brake light switch. According to the program, the control unit will reduce the fuel injection time and reduce the power output of the engine.

At this time, the control unit also received the throttle acceleration request signal, and the computer thought that these two signals were contradictory. When the control unit cannot accurately determine the cause of the fault, it will first light the EPC lamp and give an alarm to remind the user to check.

Extended data:

Precautions for automobile throttle:

1. Use special cleaning agent for throttle: If there is no special cleaning agent, when using carburetor cleaning agent, please spray the cleaning agent on a clean soft cloth first, and then wipe it repeatedly with a soft cloth to remove carbon deposit or sludge.

2. When cleaning the throttle valve, it is not necessary to disassemble it, but the sealing part of the inlet steam must be cleaned. Idle motor must be disassembled before cleaning. Removing and cleaning the nozzle has its advantages and disadvantages. In general, it is recommended that the maintenance station avoid disassembly and cleaning to prevent other unnecessary waste, such as replacing the sealing ring or installing other gaskets after disassembly, or delaying the owner's time due to oil leakage and air leakage during disassembly and assembly.

3. When the throttle is removed, some air lines are connected around the throttle. These pipes need to be dismantled. Be sure to remember the location of each pipe when disassembling, and then install it after cleaning.

Baidu encyclopedia -EPC