Circuit Description

The camshaft position (CMP) sensor correlates the crankshaft to camshaft position so that the engine control module (ECM) can determine which cylinder is ready to be fueled by an injector. As the camshaft rotates, the reluctor wheel interrupts a magnetic field produced by a magnet within the sensor and sends a signal to the ECM through the signal circuit. The CMP sensor circuits are directly connected to the ECM. The CMP sensor also determines which cylinder is misfiring. The circuits between the CMP sensor and the ECM consists of the following:

• A ground circuit
• A CMP signal circuit

If the ECM detects that a minimum number of CMP re-syncs has not occurred, the ECM fuels the engine by using the alternating synchronous double fire (ASDF) method and DTC P0341 sets.