Normal Operation

DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information) - sets in continuous memory in the Instrument Panel Cluster (IPC) if data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or more. For a complete list of all network messages, refer to MODULE COMMUNICATIONS NETWORK .
DTC P1607:87 (MIL Output Circuit: Missing Message) - sets in continuous memory in the IPC when the MIL message from the PCM is missing for 5 seconds or more.

NOTE: Once the IPC sets DTC U0100:00, multiple gauges or indicators are likely to be inoperative in the IPC. Other modules that require data from the IPC all set communication DTCs and may also exhibit system function concerns.

This pinpoint test is intended to diagnose the following: