Circuit Description
WARNING: This page is about a different car, the 1998 Cadillac Seville, 1998 Cadillac Eldorado, and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
IC module creates a 4X signal and a 24X signal that is used by the PCM for ignition and fuel control. If PCM does not receive 4X reference pulses from the IC module for greater than .4 second while engine is running, DTC will set.