Diagnostic Trouble Codes (DTCs)
OBD2 Diagnostic Trouble Codes are codes that are stored by the on-board computer diagnostic system in response to a problem found in the vehicle. These codes identify a particular problem area and are intended to provide you with a guide as to where a fault might be occurring within a vehicle.
OBD2 Diagnostic Trouble Codes consists of a five-digit alphanumeric code. The first character, a letter, identifies which control system sets the code. The other four characters, all numbers, provide additional information on where the DTC originated and the operating conditions that caused it to set.
Here below is an example to illustrate the structure of the digits:
Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the standardized 16-pins connector where diagnostic scan tools interface with the vehicle’s on-board computer or ECU Engine Computer Unit. The DLC is usually located 12 inches from the center of the instrument panel (dash), near the steering wheel, under or around the driver‟s side for most vehicles. If Data Link Connector is not located under dashboard, a label should be there indicating location. For some Asian and European vehicles, the DLC is located behind the ashtray and the ashtray must be removed to access the connector. If the DLC cannot be found, refer to the vehicle‟s service manual for the location.
See figure below:
Source: Diagnostic Tool AL519 Operations Manual
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