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The Data Link Connector is a multi-pin diagnostic communication port used to interface a scan tool with the control modules of a specific vehicle and access on-board diagnostics and live data streams for cars, trucks, and motorcycles.
Several OBD-I data link connectors are in the engine compartment before 1996, typically near the fuse block. There was also no standardization for these connectors until 1996, and each vendor had its shape with a distinctive pin configuration. In addition to the OBD-II interface, several manufacturers retained their proprietary connectors after 1996, since OBD-II ports only require the transmitting of emission-related codes and data.
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