Camshaft Position Sensor -G40-

The camshaft position (CMP) sensor is a Hall style pickup that senses a toothed camshaft reluctor ring wheel. The number of teeth will vary with engine combinations, but the main purpose is to provide a cylinder 1 Top Dead Center (TDC) after the compression stroke and to reference the camshaft position for proper timing of the camshaft advance mechanism. There will be one sensor (Camshaft Position Sensor -G40-) on engines that use no camshaft adjuster or only an intake camshaft adjuster, and two camshaft position sensors (Camshaft Position Sensor -G40- and Camshaft Position Sensor 2 -G163-) for engines which have an adjuster on the intake and exhaust camshafts. The waveform is a square wave similar to the Engine Speed Sensor -G28-, but may have less waves in sequence because of the lower number of teeth and wider spacing on the reluctor ring. If the camshaft position signal is lost, camshaft advance/retard features will be disables along with affecting sequential injection and knock retard control.