Data Link Connector: Description and Operation

ALDL Connector:

Purpose
The Data Link Connector (DLC) provides a means of communicating with the control module concerning engine and transmission operating parameters and accessing Diagnostic Trouble Codes (DTC).

Operation
The control module communicates a variety of information through the Serial Data Line (DLC terminal "M"). The data is transmitted at a high frequency which requires a Tech 1 diagnostic computer (scan) tool for interpretation. There are several other non-OEM scan tools available for displaying the same information.