Crankshaft Position Sensor

Crankshaft position sensor, used on 3.8L models, utilizes a Hall Effect switch mounted near vibration damper. Sensor monitors vibration damper position (crankshaft position) and sends signals to ignition module. These signals provide PCM with a TDC position reference for each piston, as well as supplying an engine speed (RPM) signal.

Vehicles equipped with HEI-EST distributor systems use RPM reference signal from ignition module in distributor for a crankshaft position signal. TDC intake and TDC exhaust are not differentiated; differentiation is not necessary on non-sequential fuel injected engines. Signal is used to trigger fuel injectors. For additional information, see COMPUTER CONTROLLED COIL IGNITION (C(3)I) under IGNITION SYSTEM.