System Description

The camshaft position (CMP) sensor is used to correlate crankshaft to camshaft position so that the engine control module (ECM) can determine which cylinder is ready to be fueled by the injector. The CMP is also used to determine which cylinder is misfiring when a misfire is present. When the ECM cannot use the information from the CMP sensor, a diagnostic trouble code (DTC) is set, and the ECM will fuel the engine using the alternating synchronous double fire (ASDF) method.