Cutlass Supreme V6-3100 3.1L MFI VIN M (1994)
Data Link Connector: Description and Operation
CIRCUIT OPERATION
There are two data lines that can he accessed with a scan tool. The 800 circuit data line is the Powertrain Control Module (PCM) Data Line. It
allows the Powertrain Control Module, heater and A/C Control Assembly (when equipped with Regular Production Option (RPO) C68) and
Electronic Brake Control Module (EBCM) to communicate by transmitting data through circuit CKT 800. The 835 circuit data line is the
Entertainment and Comfort (E&C Bus) Data Line. It allows the Radio, and HVAC Control Assembly (C68) to communicate via CKT 835
A scan tool can he connected to the Data Link Connector (DLC). This allows the scan tool to communicate with both the PCM Data Line and E&C
Data Lines. System operations can then be monitored for diagnostic purposes.