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- Assembly Line Diagnostic Link oder ALDL ist ein proprietäres On-Board-Diagnose-System, entwickelt von General Motors. Es wurde zuvor Assembly Line Communications Link oder ALCL genannt; die beiden Begriffe werden synonym verwendet. In Deutschland wurde ALDL vor der Einführung von OBD-2 bei Opel- und Vauxhall-Modellen eingesetzt, da Opel damals zum GM-Konzern gehörte. Das System war nur vage standardisiert und litt daran, dass die Spezifikationen für die Kommunikationsverbindung von Modell zu Modell unterschiedlich waren. ALDL wurde größtenteils von Herstellern für die Diagnose bei ihren Händlern und offiziellen Wartungseinrichtungen verwendet. Der Stecker befindet sich normalerweise unter dem Armaturenbrett auf der Fahrerseite von Linkslenker-Fahrzeugen, obwohl diese Position nicht standardisiert war. Teilweise ist er auch im Fußraum des Beifahrersitzes angebracht. In den späten 1980er Jahren wurde das System auf das ADTS-System (ALDL Development and Test System) migriert, das einen industrialisierten IBM-PC mit benutzerdefinierter Schnittstellenhardware verwendet. (de)
- Assembly Line Diagnostic Link, Assembly Line Data Link, or ALDL is a proprietary on-board diagnostics system developed by General Motors before the standardization of OBD-2. It was previously called Assembly Line Communications Link or ALCL. The two terms are used interchangeably. The ALDL communications link was originally developed at the General Motors Emissions Control Systems Project Center located at GM's Milford, Michigan Proving ground. The center was responsible for coordinating all divisional and staff design, testing and development activities of the emission control system for GM USA passenger vehicles designed to meet the requirements of the 1981 clean air act. "Project Center Chief Engineer Harry H. Lyon explains, "Basically, the ECS project center is a common watering hole for all (GM) divisional and corporate staff activities."For example, we had representation from eight component divisions, AC Spark Plug, Delco Electronics, Delco Products, Delco Remy, Diesel Equipment, Packard Electric, Rochester Products, andSaginaw Steering Gear. The five car divisions, the body and assembly divisions, seven corporate staffs, and the patent section were also represented.""This allows us to pool our knowledge and avoid costly and timely duplication, while at the same time it provides us with a centralized avenue to corporate management," said Lyon. More specifically, the center has responsibility for coordinating such projects as engineering specifications for both hardware and software." "In addition to monitoring the engine process, it is equipped to periodically read its own pulse and communicate the presence of any problems. It is able to do this by flashing a check engine light on the car's instrument panel and storing the information about a malfunction in its memory. When taken to a service center, the ECM uses thissame light to "talk" to the mechanic through a flashing code that indicates where the problem is. On Cadillacs, the proper code is digitally displayed. To ensure high quality in the Computer Command Control system, it will be given a final check at the end of the assembly line. Here the completely assembled vehicle will be tested by connecting the computer to a test computer. This will significantly improve GM's ability to catch anything wrong with the system or the car's engine." A specification was written for the data link and provided to the service community by the project center service engineers in 1981 (XDE-5024B). This system was only vaguely standardized and suffered from the fact that specifications for the communications link varied from one model to the next. ALDL was largely used by manufacturers for diagnostics at their dealerships and official maintenance facilities. The connector is usually located under the dash on the driver's side of left-hand drive (LHD) vehicles, though this location was not standardized. For the assembly plant test system computer that was connected to this vehicle connector and known by the same name, see the article IBM Series/1. In the late 1980s the system was migrated to the ADTS system (ALDL Development and Test System) which utilized an industrialized IBM PC with custom interface hardware. (en)
- Assembly Line Diagnostic Link ou ALDL é um sistema de diagnóstico a bordo proprietário desenvolvido pela General Motors antes da padronização do OBD-I. Este sistema foi vagamente padronizado e sofreu com o fato de que as especificações para o link de comunicação variou de um modelo para outro. ALDL foi largamente utilizada pelos fabricantes para o diagnóstico de suas concessionárias e autorizadas. (pt)
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