Sensor, Camshaft Position, 2.0L Diesel: Operation
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The signal circuit of the Camshaft Position (CMP) sensor has a voltage of approximately 5 volts. If the segment machined into the exhaust camshaft sprocket is positioned opposite the CMP sensor, the camshaft signal is approximately 0 volts. This 0 volt to 5 volt signal is used by the Powertrain Control Module (PCM) for detecting ignition Top Dead Center (TDC) of cylinder 1 as the engine rotates. If no signal is supplied by the CMP sensor, the vehicle will not start.