Cavalier L4-2.2L VIN 4 (1998)
Data Link Connector: Description and Operation
There are two data lines that can be accessed with the scan tool. The Serial Data Line UART (800 Circuit) allows the scan tool (when connected),
Powertrain Control Module, Instrument Panel Cluster, Sensing and Diagnostic Module, and the Electronic Brake Control Module to communicate via
serial data. The Serial Data Line Class 2 (1807 Circuit) allows the scan tool to directly access the Powertrain Control Module to read emissions related
information. The scan tool can gain access to both data lines through the Data Link Connector (DLC). System operations can then be monitored or
controlled for diagnostic purposes.
