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Learn about the history, standards and applications of on-board diagnostics (OBD), a vehicle's self-diagnostic and reporting capability. OBD systems provide real-time data and trouble codes to detect and monitor emissions failures and other malfunctions.
OBD-II PIDs are codes used to request data from a vehicle, used as a diagnostic tool. Service 01 (Show current data) provides real-time information on engine and vehicle status, such as fuel trim, coolant temperature, and vehicle speed.
ELM327 is a programmed microcontroller that translates the on-board diagnostics (OBD) interface found in most modern cars. It supports various protocols and commands to read and clear trouble codes, display sensor data, and control vehicle functions.
SAE J1939 is a recommended practice for data exchange among vehicle components, using CAN or CAN FD as the physical layer. It is widely used in the commercial vehicle area, especially for diesel engine control and telematics, and has a range of standard and proprietary Parameter Group Numbers (PGNs).
The data link connector (DLC) is the multi-pin diagnostic connection port for automobiles, trucks, and motorcycles used to interface a scan tool with the control modules of a given vehicle and access on-board diagnostics and live data streams. [1] Prior to 1996, many OBD-I data link connector's were in the engine compartment, usually near the ...
Unified Diagnostic Services (UDS) is a diagnostic communication protocol for electronic control units (ECUs) in automotive electronics, specified in ISO 14229-1. It allows diagnostic tools to access and control various functions and data of ECUs, such as fault memory, firmware, security, and parameters.
An event data recorder (EDR) is a device in some automobiles that records information related to traffic collisions. EDRs may store data such as speed, braking, position, safety systems, and airbag deployment, but the number of data elements and pages vary by vehicle model and regulation.
SAE J1587 is an automotive diagnostic protocol standard for heavy-duty and most medium-duty vehicles built after 1985. It uses different diagnostic connectors and is used in conjunction with SAE J1708 for automobile communication.