Camshaft Position (CMP) Sensor

The cam sensor is located on the timing cover behind the water pump near the camshaft sprocket. As the camshaft sprocket turns, a permanent magnet activates the Hall-Effect switch in the cam sensor. When the Hall-effect switch is activated, it grounds the signal line to the ECM, pulling the cam signal line's applied voltage low. This is interpreted as a cam signal. The cam signal is created as piston #1 is approximately 25° after top dead center on the power stroke. When the cam signal is not received by the ECM, a Code 41 will set.