How to judge good or bad crankshaft sensor, occasional failure of crankshaft sensor

The crankshaft position sensor is mainly used to determine the position of the crankshaft. It can detect the piston top dead center signal and the crankshaft angle signal, and send the detected signal to the ECU, which is used to control the ignition timing and fuel injection timing. It is used to control the ignition of the engine And a signal generator to determine the position of the crankshaft.

How to judge good or bad crankshaft sensor

If the crankshaft position sensor is broken, the engine fault light on the instrument panel will light up. The engine computer cannot receive the signal from the crankshaft position sensor, and cannot confirm the crankshaft angle. The car will have no high-voltage electricity, cannot start, and does not ignite or inject fuel.

It can be judged by measuring the voltage, turn on the ignition switch, and measure the grounding voltage of the two signal lines, which is generally 1.4V. This is the engine control unit.YuanThe preset voltage on the signal line. When the starter is turned on, the signal voltage measured by the crankshaft position sensor should be close to 1.6V. If the signal circuit inside the sensor or the engine control unit is open or shorted, the computer cannot receive the crankshaft position signal and the engine cannot be started.

Incidental failure of crankshaft sensor

There are many types of crankshaft position sensors. There are different types of crankshaft position sensors for different models. According to the principle of signal generation by the sensor, it can be divided into three types: magnetic induction, photoelectric and Hall.The type of crankshaft position sensor is different, and the cause of the failure is also different. The crankshaft sensor has occasional failures, and it is no problem if it can drive normally, but it is best to go to a repair shop for inspection. This type of failure can generally be cleared and deleted by a computer.error codeThat's it.