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 VAG-COM USB KKL 409.1 OBD2 OBDII Cable Scanner ISO9141 for AUDI Volkswagen Skoda US $7.99
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 USB interface Vag-Com OBD2 Cable Scanner VW Audi VagCom US $6.31
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Audi Scanner
OBD II Scanner And The Past
The OBD II scanner or on-board diagnostics is a generic term used if we are talking about the capability of a vehicle to report and self-diagnose. This system provides the car owner or the technician access to the health status of the car by looking into some information delivered by the sensors throughout the car engine. The volume of the diagnostic information the OBD II scanner and mercedes benz manual book depicts widely differ since on-board car computers were introduced in 1980s. Some of the early devices that are similar to OBD II scanner merely worked by illuminating an indicator light which would mean that there is a malfunction it the vehicle. Such old devices are very insufficient because they are not capable of providing information as to the specific part of the vehicle which has issues. This is in contrast with the modern OBD compliant devices because we can now easily detect the specific issue(s) of the vehicle through the help of standardized digital communication ports that work very fast. Diagnostic trouble codes or DTCs are used in identifying and solving the car malfunctions and issues. Here are some of the historical accounts that led to the development of OBD 2 technology.
The Volkswagen car company was the first one to introduce an on-board computer system that is capable of scanning mounted on their type 3 fuel-injected cars. In 1975, Datsun 280Z On-board computers were attached on their production line vehicles which were urged by the necessity of having a real-time tuning mechanism of the system for fuel-injection. It was a very basic version of OBD and Chiltons auto repair manual but the way it is being monitored as well how problems are reported have not been standardized yet. Another significant event followed in 1980 when General Motors implemented a proprietary interface as well as a protocol for the Engine Control Module (ECM) testing on the assembly line of their vehicles. The interface was called the Assembly Line Diagnostic Link (ALDL). It is a protocol that sends message at 160 baud and the few vehicle systems are being signalled and monitored by a Pulse Width Modulation (PWM). The ALDL was implemented in California in 1980 and in other American states in 1981. However, the ALDL cannot be used outside the factory where the cars are being manufactured unlike the OBD II scanner.
In 1986, the ALDL protocol was upgraded. It transformed into GM XDE-5025B which could communicate at a much higher baud of 8192. The following year, The California Air Resources Board (CARB) compelled all California-manufactured vehicles since 1988 to have at least basic OBD capabilities. This was called the OBD I or the first version of what we now know as the OBD II scanner and 149.99 obd2 scanner. The OBD I’s connector and location inside the vehicle was not yet standardized thus causing difficulty for the mechanic and the car owner to detect it. They were able to get rid of this issue by creating the OBD II scanner in 1994.
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