What are the consequences of a failed crankshaft position sensor?
2 Answers
If the crankshaft position sensor is damaged, the engine control unit cannot receive the reference signal during startup, and the ignition coil will not generate high voltage. If the engine is not started within 2 seconds after turning on the ignition switch, the engine control unit will cut off the control voltage to the fuel pump relay, stopping power supply to the fuel pump and ignition coil, resulting in the vehicle being unable to start. Below are the functions and location of the crankshaft position sensor: Function of the crankshaft position sensor: The crankshaft position sensor determines the position of the crankshaft, i.e., the crankshaft's rotation angle. It typically works in conjunction with the camshaft position sensor to determine the basic ignition timing. Location of the crankshaft position sensor: The crankshaft position sensor is usually installed at the front or rear of the crankshaft near the flywheel, or in the middle of the crankshaft. In older vehicle models, it may also be located inside the distributor. It is one of the most important sensors in the control system.
When the crankshaft position sensor fails, it really gives me a headache. As a young guy who loves driving around, I once had the car suddenly stall on the road when this thing malfunctioned, nearly causing a big accident. The consequences of sensor failure are numerous: first, the engine won't start or may suddenly stop while driving, because it's responsible for telling the engine control computer where the crankshaft is rotating. Without a signal, the computer gets confused, messing up ignition and fuel injection. The check engine light on the dashboard will definitely come on, and you might feel the car shaking, struggling to accelerate, with fuel consumption skyrocketing. Worse yet, ignoring it long-term could damage the engine, leading to costly and labor-intensive repairs. So now I check the wiring harness monthly to ensure stable connections, avoiding such messes. Similar failures often occur in rainy weather, so I always remind my friends not to ignore small warning signs.
