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#Aldl protocol code
The only available function for the owner is "Blinky Codes" that transmit the Diagnostic Trouble Code (DTC) with the blinking pattern of the "Check Engine" (MIL) light.
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The 'assembly line diagnostic link' ( ALDL) protocol communicates at 160 bit/s Implemented on California vehicles for the 1980 model year, and the rest of the United States in 1981. 1980: General Motors implements a proprietary interface and protocol for testing of the Engine Control Module (ECM) on the vehicle assembly line.Simple OBD implementations appear, though there is no standardization in what is monitored or how it is reported. 1975: Datsun 280Z On-board computers begin appearing on consumer vehicles, largely motivated by their need for real-time tuning of fuel injection systems.1968: Volkswagen introduces the first on-board computer system with scanning capability, in their fuel-injected Type 3 models.
#Aldl protocol series
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. Early versions of OBD would simply illuminate a malfunction indicator light or " idiot light " if a problem was detected but would not provide any information as to the nature of the problem. The amount of diagnostic information available via OBD has varied widely since its introduction in the early 1980s versions of on-board vehicle computers. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle subsystems. On-board diagnostics ( OBD ) is an automotive term referring to a vehicle's self-diagnostic and reporting capability.