Lumina V6-3.8L VIN K (1998)
Camshaft Position Sensor: Description and Operation
DESCRIPTION
The Camshaft Position Sensor (CMP) is located on the timing cover behind the water pump near the camshaft sprocket. As the camshaft sprocket
turns, a magnet in it activates the Hall effect switch in the camshaft position sensor. When the Hall-effect switch is activated, it grounds the signal line
to the Ignition Control Module (ICM), pulling the camshaft position sensor signal circuit's applied voltage low. This is interpreted as a CMP Sensor
signal. The CMP Sensor signal is created as piston #1 is approximately 25 degrees after top dead center on the power stroke.
