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The ELM327 abstracts the low-level protocol and presents a simple interface that can be called via a UART, typically by a hand-held diagnostic tool or a computer program connected by USB, RS-232, Bluetooth or Wi-Fi. [2] New applications include smartphones. [3] There are a large number of programs available that connect to the ELM327. [4] [5]
An automotive scan tool (scanner) is an electronic tool used to interface with, diagnose and, sometimes, reprogram vehicle control modules. [1] There are many types from just as many manufacturers, one of the most familiar being the Snap-On Inc. "brick", or MT2500/MTG2500. Snap-On, Hella Gutmann Solutions, OTC/SPX, Xtool india, Autel, Launch ...
(GM did not use the term OBD 1.5 in the documentation for these vehicles — they simply have an OBD and an OBD-II section in the service manual.) For example, the 1994–1995 model year Corvettes have one post-catalyst oxygen sensor (although they have two catalytic converters ), and have a subset of the OBD-II codes implemented.
The OBD-II DLC (post-1996 vehicles) is usually located under the instrument panel on the driver side, though there are several exceptions. The SAE J1962 specification provides for two standardized hardware interfaces, called type A and type B. Both are female, 16-pin (2x8), D-shaped connectors, and both have a groove between the two rows of pins.
OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool. SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections .
Transport-layer services include the transmission of multi-CAN-frame messages based on the ISO 15765-2 multi-frame messaging scheme. It was developed and is used primarily by General Motors for in-vehicle communication and diagnostics. [3]
OBD may refer to: On-board diagnostics , an electronics self diagnostic system, typically used in automotive applications Optimal biological dose , the quantity of a radiological or pharmacological treatment that will produce the desired effect with acceptable toxicity
It may also provide in-vehicle connectivity via Wifi and Bluetooth and implements the eCall function when applicable. In the automotive domain, a TCU can also be a transmission control unit. A TCU consists of: A satellite navigation (GNSS) unit, which keeps track of the latitude and longitude values of the vehicle