Mark 307 neutral coaxed the throttle to 4000 rpm. The fault light is on. Check the crankshaft position sensor for short circuit. What is the reason?

It consists of light emitting diode, photosensitive diode and shading disk.

The light-emitting diode faces the photosensitive diode, and the light-emitting diode takes the photosensitive diode as the irradiation target. The signal panel is located between the light emitting diode and the photosensitive diode. When the signal panel runs with the crankshaft of the engine, because there are light holes on the signal panel, the light transmission and shading change alternately, so that the signal generator outputs pulse signals representing the position and rotation angle of the crankshaft. The electronic control unit calculates the rotational speed of the engine crankshaft according to the signal.

Four common fault types

Maximum fault, the signal exceeds the upper limit of the normal range.

Minimum fault, the signal exceeds the lower limit of the normal range.

Signal failure, no signal.

Unreasonable fault, signal, but unreasonable signal.

Crankshaft position sensor is a very important sensor in engine. If there is a fault, the most common performance should be that it cannot be started.