With Manufacturer's Scan Tool

Data Link Connectors (DLC):

The provision for communicating is the Data Link Connector (DLC) (refer to Figure). It is usually located under the instrument panel and is sometimes covered by a plastic cover labeled "DIAGNOSTIC CONNECTOR." It is used in the assembly plant to receive information in checking that the engine is operating properly before it leaves the plant. The connector can also be used by the service technician to identify stored trouble codes and to read ECM/PCM/VCM data using a hand held scan tool.

The recommended method for reading diagnostic trouble codes stored in memory is by using diagnostic scan tool plugged into the DLC connector. Follow instructions supplied by tool manufacturer.