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.