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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 185 (Engine Controls - 3.5L - Introduction (2 Of 2)) >> Description and Operation >> Electronic Ignition (EI) System Description >> Camshaft Position (CMP) Sensor

Camshaft Position (CMP) Sensor

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The camshaft position (CMP) sensor signal is a digital ON/OFF pulse output once per revolution of the camshaft. The CMP sensor does not directly affect the operation of the ignition system. The CMP sensor information is used by the powertrain control module (PCM) to determine the position of the valve train relative to the crankshaft position. By monitoring the CMP and crankshaft position (CKP) signals, the PCM can accurately time the operation of the fuel injectors. The PCM supplies the sensor with a 12-volt reference circuit, a low reference circuit and a signal circuit.

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