Crankshaft Position Sensor

Crankshaft position sensor, used on 3.8L engine, utilizes a Hall Effect switch mounted near vibration damper. The sensor monitors vibration damper position (crankshaft position) and sends signals to ignition module. These signals provide ECM with a TDC position reference for each piston, as well as supplying an engine speed (RPM) signal. This allows ECM to compute crankshaft position and RPM and fire appropriate ignition coil at the proper time. Crankshaft position sensor signal is also used in conjunction with the camshaft position sensor signal to determine triggering of the sequentially-fired fuel injectors. For additional information, see COMPUTER CONTROLLED COIL IGNITION (C(3)I) under IGNITION SYSTEM (GASOLINE) .