Note. For circuit reference, see DTC P0560 schematic.
Circuit Description
PCM contains Output Driver Modules (ODM) that provides 7 switchable ground outputs for operating solenoids, relays, indicator lights, and other devices. Each of these ground outputs has fault lines that feed back to the PCM's microprocessor. ODM No. 1 can also sense high voltage coming in which might damage microprocessor. DTC P1640 is used to monitor ODM No. 1 over voltage sense line.