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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 >> Crankshaft Reluctor Wheel

Crankshaft 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 crankshaft reluctor wheel is part of the crankshaft. The reluctor wheel contains a pattern around the circumference of the wheel consisting of 58 teeth and a reference gap. Each tooth on the reluctor wheel is spaced at 60 tooth spacing or 6 degrees apart from each other with 2 missing teeth for the reference gap. The engine control module (ECM) uses the teeth and reference gap to determine the crankshaft position (CKP) and speed.

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