What is the reason for the open circuit in the power supply A of the Audi injection valve?

[DelJulia]

There may be an issue with the wiring from the fuel injector to the engine control unit. Introduction to the Injection Valve: It is a vacuum-operated valve used in turbocharged or centrifugal supercharged vehicles, designed to release excess pressure in the intake system when the throttle valve is opened or closed. The released air pressure is then recirculated back to the normal pressure intake port before the turbocharger and after the mass airflow sensor. Working Principle: The injection valve is connected to the intake manifold behind the throttle valve plate via a vacuum tube. When the throttle valve is closed, a vacuum is created in the intake manifold behind the plate, which "sucks" the injection valve open. The excess pressure from the turbocharger is vented into the atmosphere or recirculated upstream into the intake system at the compressor inlet.

[FelixAnn]

As a technician frequently handling Audi repairs, I have encountered numerous cases of injector power supply A circuit open. The most common cause is aging and damaged wiring, where prolonged vehicle use leads to harness insulation wear exposing copper wires, making it prone to short circuits and blown fuses during rainy weather or on bumpy roads. Another frequent factor is connector corrosion; Audi's injector connectors are susceptible to rust and poor contact in high-humidity environments. Additionally, there's the issue of faulty control modules responsible for power distribution—internal component damage can lead to circuit opens. Some cases involve improper modifications, such as installing non-compliant audio systems that overload the power supply and burn out wiring. During every inspection, I recommend first using a diagnostic tool to check fault codes and narrow down the issue, preventing overall engine performance degradation that could cause shaking and increased fuel consumption. Safety first—visit a professional shop early.

[OPeyton]

Over the years of driving my Audi A6, I've personally experienced the hassle of a power supply A circuit failure. That time, after starting the car, the injector didn't respond. Upon inspection, the circuit break was mostly due to a blown fuse or loose wiring connections. In older Audi vehicles, wiring harnesses are prone to fatigue cracking, especially in winter when cold contraction causes poor contact. Controller issues can also indirectly affect the power supply. I remember the problem disappeared after replacing it once, but neglecting maintenance before almost dragged down the engine. Now, every time I wash or service the car, I ask the technician to check the circuit to prevent similar issues, avoiding breakdowns that could disrupt my trip.

[AthenaDella]

Injection valve power supply A circuit interruption in Audi vehicles is typically caused by damaged wiring, fuse issues, or connector faults. Wires short-circuit due to wear and tear, easily blowing fuses, while corroded connectors lead to poor contact, or the controller abnormally interrupts current. Prompt repairs can prevent power loss and ensure driving safety.