Data Link Connector

Fuel/Ignition System -- Sheet 8w-30-3:

Fuel/Ignition System -- Sheet 8w-30-4:

The Data Link Connector is part of the larger Fuel/Ignition System.
For complete diagrams of that system:
you can refer to Group 8W-30 in the vehicle level (Complete Body and Chassis Diagrams) diagrams. Electrical Diagrams
or you can refer to Powertrain Management. Electrical Diagrams