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Home >> Buick >> 1992 >> Roadmaster Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Camshaft Position Sensor (C3I System)
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Camshaft Position Sensor (C3I System)

3.8L C3I-equipped models use a Hall Effect camshaft position sensor, 3.3L C3I-equipped models use a combination cam and crank Hall Effect sensor and 4.9L models use a Hall Effect camshaft sensor located inside of the HEI distributor.

The cam sensor provides ECM with a TDC No. 1 signal used to compute the exact position of valves. This allows ECM to properly time ignition and fuel injection operation on PFI-equipped models. A fault in the cam sensor circuit (no cam sensor signal) will result in a no-start condition (except 4.9L) and should set a related trouble code. For additional information, see COMPUTER CONTROLLED COIL IGNITION (C3I) and HEI-EST DISTRIBUTOR under IGNITION SYSTEM.

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