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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 186 (Engine Controls - 3.9L - Introduction (2 Of 2)) >> Description and Operation >> Electronic Ignition (EI) System Description >> Camshaft Reluctor Wheel

Camshaft Reluctor Wheel

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 reluctor wheel is part of the camshaft. The wheel contains a pattern around the circumference, consisting of 2 narrow teeth and 2 wide teeth. The 4 falling/trailing edges of all 4 teeth are evenly spaced 90 degrees apart. The engine control module (ECM) decodes the narrow and wide tooth pattern to identify camshaft position.

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