OBD systems give the vehicle owner or a repair technician access to state of health information for… … Wikipedia On-board diagnostics - On Board Diagnostics, or OBD, in an automotive context, is a generic term referring to a vehicle s self diagnostic and reporting capability. Acronym for assembly line data link … Dictionary of automotive termsĪssembly line data link - (ALDL) An electrical connector used on GM vehicles to check a vehicle engine management system while it is on the assembly line and later once it is in operation, to output its trouble codes … Dictionary of automotive termsĪssembly Line Data Link connector - (ALDL) a diagnostic connector used in General Motors vehicles … Dictionary of automotive terms No battery voltage is present in the 12 pin ALDL connector.ĪLDL - Acronym for assembly line diagnostic link a diagnostic connector. There were generally only three pins used for basic ALDL -ground, battery voltage, and a single line for data-, although other pins were often used for additional vehicle-specific diagnostic information and control interfaces. Unfortunately, the definition of which signals were present on each pin varied between vehicle models. Note the difference in pin ordering between the connectors and the fact that the letter I is not used. The pins are given letter designations in the following layouts (as seen from the front of the vehicle connector): General Motors implemented both a 5-pin connector and a 12-pin connector, with the 12 pin connector being used in the vast majority of GM cars. There were at least three different connectors used with ALDL. ALDL was largely used by manufacturers for diagnostics at their dealerships and official maintenance facilities. This system was only vaguely standardized and suffered from the fact that specifications for the communications link varied from one model to the next. Assembly Line Diagnostic Link or ALDL was a proprietary on-board diagnostics system developed by General Motors prior to the standardization of OBD-I.ĪLDL was previously called Assembly Line Communications Link or ALCL.
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