DTC P1377 - Ignition Control (Ic) Module Cam Pulse To 4X Reference Pulse Comparison: Notes
WARNING: This page is about a different car, the 1996 Cadillac Seville, 1996 Cadillac Eldorado, and 1996 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit reference, see DTC P0300 schematic.