Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Information Bus: Description and Operation
There are two data lines that can be accessed with a scan tool. The Serial Data Line UART (800 CKT allows the scan tool (when connected), Powertrain
Control Module (PCM), Instrument Panel Cluster, Sensing Diagnostic Module, PRNDL Control Module, and the Electronic Brake Control Module
(EBCM) to communicate via serial data. The Serial Data Line Class 2 (1807 CKT) allows a scan tool to directly access the Powertrain Control Module
to read emissions related information. A 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.
