What is a camshaft position sensor and what is its function?
The camshaft sensor measures the position of the camshaft. This signal – in conjunction with the crankshaft position – is used to determine in which stroke each cylinder is. The engine control unit (ECU) needs the signal to determine when to inject fuel and to define the right ignition timing.
How is a camshaft position sensor tested?
For an inductive sensor, the internal resistance can provide a hint that the sensor is defective. In most cases, a nominal resistance reads between 500 and 1500 Ohms. For hall sensor types (installed in almost all modern engines), and for a proper diagnosis of inductive sensors, the output signal should be recorded with an oscilloscope.
