What is the fuel pressure data stream channel number for Volkswagen?
3 Answers
Volkswagen oil pressure channel number is data stream group 140. Below is the relevant introduction: 1. Oil pressure: Depending on the model, oil pressure may vary. Most models only require around 300kpa, which is generally normal. Insufficient fuel pressure can cause difficulties in starting, stalling, and lack of acceleration. 2. High-pressure direct injection injector: The high-pressure direct injection injector is supplied with high-pressure fuel by the high-pressure pump, which distributes the fuel to the injectors via the high-pressure fuel distribution pipe. Low-pressure fuel is supplied by the high-pressure pump's guide connection device, and the fuel enters the low-pressure fuel rail.
I just checked during car repair that Volkswagen's fuel pressure data stream needs to be viewed with a diagnostic tool. For MQB platform vehicles like Golf and Tiguan, entering the engine system and selecting channel 140 shows the high-pressure fuel rail pressure (unit is Bar). At idle, it should be around 40Bar, and can surge up to 200Bar when flooring the accelerator. If the data fluctuates significantly, it's likely the high-pressure pump is faulty or there's an issue with the pressure sensor. Remember to also check the low-pressure fuel pump data (channel 106), as combining both datasets is necessary to determine whether it's insufficient fuel supply from the pump or a clogged injector. For such professional data, it's best to have a repair shop read it using ODIS equipment, as ordinary diagnostic tools may not display detailed parameters.
Last month my car's engine light came on, so I used a Bluetooth OBD to check the fuel pressure. For Volkswagen models, enter these PIDs in the Torque App: for the high-pressure fuel rail, use address 22B126, and apply the conversion formula (multiply by 0.01) to get the actual Bar value; for the low-pressure side, enter 22B120 to check the fuel pump pressure. However, note that the channel numbers may vary across different models—my neighbor's Passat B8, for example, uses channel 230 for high-pressure readings. When analyzing the data, focus on three key aspects: whether the pressure quickly rises above 50Bar during a cold start, if the pressure remains stable during sudden acceleration, and how fast the pressure drops after the engine is turned off. If the pressure values fluctuate erratically, it’s likely due to air in the fuel lines or a stuck pressure regulator.
