Circuit Description
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The Camshaft Position (CMP) sensor has a 12-volt reference circuit, a low reference circuit, and a signal circuit. The Powertrain Control Module (PCM) supplies 12 volts to the sensor. The PCM determines which pair of cylinders is at Top Dead Center (TDC) using the Crankshaft Position (CKP) sensor data. The CMP sensor signal, when combined with the CKP sensor signal, enables the PCM to determine exactly which cylinder is on a firing stroke. The PCM can then properly synchronize the ignition system, fuel injectors, and knock control.