#2012 gmc 3500 tcm connector endview serial#
Other control modules on the serial data circuit, which expect to receive that SOH message, detect its absence those control modules in turn set a DTC associated with the loss of SOH of the non-communicating control module. When a control module stops communicating on the serial data circuit, for example if the module loses power or ground, the SOH message it normally sends on the serial data circuit disappears. When the ignition switch is in RUN, each control module communicating on the serial data circuit sends a state of health (SOH) message to ensure that the control module is operating properly. Once the scan tool is connected to the serial data circuit through the DLC, the scan tool can be used to monitor each control module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). The serial data circuit is the means by which the control modules in the vehicle communicate with each other.
Scan tool does not communicate with powertrain high speed GMLAN device Scan tool does not communicate with high speed GMLAN deviceģ. Scan tool does not communicate with low speed GMLAN deviceĢ. Powertrain High Speed GMLAN Serial Data (−)ġ.
Powertrain High Speed GMLAN Serial Data (+) Review Strategy Based Diagnosis for an overview of the diagnostic approach.ĭiagnostic Procedure Instructions provides an overview of each diagnostic category. Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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