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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - Introduction >> Description and Operation >> Electronic Ignition (EI) System Description >> Camshaft Position (CMP) Sensor

Camshaft Position (CMP) Sensor

The camshaft position (CMP) sensor signal is a 1X digital ON/OFF pulse, with an 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 PCM to determine the position of the valve train relative to the CKP sensor. By monitoring the CMP and CKP signals the PCM can accurately time the operation of the fuel injectors. The CMP signal circuit is an input to the ICM.

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