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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Introduction (2 Of 2)) >> Description and Operation >> Electronic Ignition (EI) System Description >> Crankshaft Reluctor Wheel

Crankshaft Reluctor Wheel

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The crankshaft reluctor wheel is part of the crankshaft. The reluctor wheel consists of 58 teeth and a reference gap. Each tooth on the reluctor wheel is spaced at 6 degrees apart from each other, for a total of 60-tooth spacing around the circumference of the wheel. The crankshaft reluctor wheel is missing 2 of the 60 teeth. The 2 missing teeth are used to create 12 degrees of spacing, which is used for the reference or sync pulse. The sync pulse is used by the engine control module (ECM) to synchronize the coil firing with the crankshaft position, while the other teeth provide cylinder location during each crankshaft revolution.

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