Crankshaft Position Sensor
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, 2002 Chrysler Town & Country, and 2001 Dodge Grand Caravan. However, it is still accessible from the selected car via links, so may be relevant.
For crankshaft position sensor testing, see DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - CARAVAN, TOWN & COUNTRY, & VOYAGER article.