Skylark V6-3100 3.1L VIN M SFI (1996)
Serial Data: Component Tests and General Diagnostics
Circuit Operation
There are two data lines that can he accessed with a scan tool. The Serial Data Line UART (800 CKT) allows the scan tool (when connected),
Powertrain Control Module, Instrument Cluster, Sensing Diagnostic Module, and the Electronic Brake Control Module 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.
Chart #1 Serial Data Line Diagnosis (Part 1 Of 2)
