These modules monitor the link for serial data. The class 2 serial data line on this vehicle is a star configuration, with the Body Control Module (BCM) and Powertrain Control Module ( PCM) each have a second class 2 serial data line between them. DTC U1026 Loss of ATC Class 2 Communication Circuit Description The class 2 circuit connects to various modules. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, Diagnostic Trouble Code (DTC) U1000 is set. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. Operating information and commands are exchanged among the modules. Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation.
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