What is the reason when the Audi ignition is on but the engine cannot start?
1 Answers
The reason why the Audi ignition is on but the engine cannot start is due to a B281 circuit break, causing the engine control unit to lack the 15-line power supply, which prevents the engine control unit from functioning properly. Symptoms of ignition system failure include: Difficulty starting: Mainly manifested as difficulty when starting the vehicle, with normal idle speed and normal acceleration in neutral gear, occasional jerking when starting, and the vehicle being prone to stalling when starting on an uphill slope. Engine misfire: Mainly manifested as no issues during idle and low-speed driving, but the vehicle starts to shake after maintaining high-speed continuous driving for a period of time. Engine shaking when the vehicle is parked: Mainly manifested as the engine shaking when the vehicle stops at a traffic light, with the shaking subsiding when the engine speed is increased and operation becomes smoother. Lack of engine acceleration: Mainly manifested as difficulty starting when the engine is cold, followed by idle shaking, weak acceleration, and a noticeable increase in fuel consumption after starting. Engine failure to start: Mainly manifested as the starter motor turning when starting, but the engine fails to start.
