CLAS AC 5247 Mode D'emploi page 28

AC 5247
READER DEFAULT CODE OBDII
2. Diagnostic Trouble Codes (DTCs)
OBDII Diagnostic Trouble Codes are codes that are stored by the onboard 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. OBDII
Diagnostic Trouble Codes consist of a fi ve-digit alphanumeric code. The fi rst character, a
letter, identifi es 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 digits:
3. Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the standardized 16-cavity
connector where diagnostic scan tools interface with the vehicle's on-board computer.
The DLC is usually located 12 inches from the center of the
instrument panel (dash), under or around the driver's side for most
vehicles. If Data Link Connector is not located under dashboard, a
label should be there telling 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.