Code P047, IPC-To-Pcm Data Link Problem: Notes

PCM and IPC share information through Universal Asynchronous Receiver Transmitter (UART). IPC is master link and data are only transmitted at IPC request. Data are sent in 8-character blocks at a rate of 8192 characters per second.

Data from PCM to IPC contain engine operating information. PCM-IPC data include CTS, RPM and injector pulse width values so IPC can control cooling fans, display RPM and calculate MPG for display at Driver Information Center (DIC) panel. IPC sends PCM A/C status to be used for idle speed control and ambient temperature for use in TCC application and release decisions.

Code P047 is set in PCM in event of a UART failure. If fault is a current failure, PCM will not be able to communicate with IPC and IPC Code IO34 will be displayed as current. Code P047 is current in PCM but cannot be sent (displayed) to IPC because of UART fault. If UART fault is corrected, both Codes P047 and IO34 will be displayed as history codes.

Code P047 should be diagnosed using chart for IPC Code IO34. Diagnose instrument panel cluster.