On-board diagnostics (OBD) is an automotive term referring to a vehicle self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle subsystems. The amount of diagnostic information available via OBD has varied widely since its introduction in the early 1980s versions of on-board vehicle computers. Early versions of OBD would simply illuminate a malfunction indicator light if a problem was detected but would not provide any information as to the nature of the problem. Modern OBD implementations use a standardized digital communications port to provide real-time data in addition to a standardized series of diagnostic trouble codes, or DTCs, which allow one to rapidly identify and remedy malfunctions within the vehicle.

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  • OBD-2 J1850 PWM, J1850 VPW RS-232 cables scheme J1850 VPW interface exist in General Motors and Chrysler vehicles, J1850 PWM exists in Ford models to 2003 with EEC-V system, Ford Cougar (all UK models), Ford Puma, Ford Fiesta Zetec (models to 2003), Ford Mondeo Zetec (models to 2003), Ford Focus (models to 2003), newer Jaguar S-Type and Jaguar X-Type and pre 2004 Mazdas vehicles.

 
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