What is the channel number for Volkswagen fuel pressure data stream?
2 Answers
The channel number for Volkswagen fuel pressure data stream is data stream group 140. The fuel pressure is measured through the fuel pressure regulator. The following is an introduction to the fuel pressure regulator: 1. Introduction to the fuel pressure regulator: The fuel pressure regulator is essentially an overflow valve controlled by a diaphragm. The diaphragm divides the regulator into an upper spring chamber and a lower fuel chamber. The diaphragm controls the opening of the overflow valve to maintain pressure balance between the upper and lower chambers. 2. Working principle: When the fuel pressure in the fuel chamber exceeds the combined force of the spring pressure and vacuum pressure, the diaphragm arches upward, opening the regulator valve. Some fuel flows back to the fuel tank through the return port via the ball valve, reducing the fuel pressure. When the pressure drops to the set control pressure of the regulator, the ball valve closes to maintain a certain pressure in the fuel line from the pump check valve to the pressure regulator.
Our repair shop frequently services Volkswagen vehicles, and to check the fuel pressure data stream, we need to access the engine module. The high-pressure fuel circuit pressure channel number is 023-106, which displays the current fuel pressure value of the direct injection system. Sometimes, even if the dashboard doesn’t show a fault light, the car may experience hesitation during acceleration. In such cases, I monitor the real-time fluctuations in this channel. Under normal conditions, the idle pressure should fluctuate around 40 bar, and a sudden throttle press should surge it above 100 bar. If the pressure fails to rise, the high-pressure fuel pump filter screen is prone to clogging. For the low-pressure fuel circuit, check channel 230, where the data unit is kPa. When the engine is running, it should be at least 350 kPa or higher. If the value is too low, the first thing to check is whether the fuel filter is clogged. The low-pressure pump in the fuel tank also fails quite often. Just the other day, we repaired a Tiguan where the low-pressure pump’s carbon brushes were completely worn out, causing the idle pressure to drop to 200 kPa, making it hard to start.
