Crankshaft (3X/7X) Sensor (3.1L)

A 7X crankshaft signal is generated by a 2-wire, Permanent Magnet (PM) generator Crankshaft Position (CKP) sensor which is mounted through side of engine block. See CRANKSHAFT POSITION SENSOR  . Ignition module converts this 7X signal to a 3X signal which is passed on to the PCM. The 7X signal is used by the ignition control module to determine which ignition coil to fire. The 3X signal is used by the PCM to determine RPM, crankshaft position, injector timing and to compute ignition timing at engine speeds greater than 1200 RPM.