Data Link Connector: Description and Operation

1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4SECTION Description and Operation
A Scan Tool can be connected to the DLC; this allows the Scan Tool to communicate with either the PCM, DERM and/or VCM. System operations can then be monitored for diagnostic purposes.

There are two data lines access with a Scan Tool. Circuit 800 (TAN) UART data line allows the Powertrain Control Module and the Diagnostic Energy Reserve Module to communicate with each other and/or a Scan Tool. Circuit 1807 (PPL) CLASS-2 data line allows the Vehicle Control Module to communicate with a Scan Tool.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.