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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.
Learn about the common types of components of internal combustion engines, such as cylinders, ignition system, fuel system, and cooling system. See how the number and type of cylinders, the ignition timing, and the fuel mixture affect the performance and efficiency of different engines.
A check engine light or malfunction indicator lamp (MIL) is a tell-tale that a computerized engine-management system indicates a problem with the vehicle. The MIL can have different causes and effects, such as a loose gas cap, worn spark plugs, or a faulty oil valve.
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.
A PCM is a control unit for motor vehicles that combines the engine control unit and the transmission control unit. It controls more than 100 factors in a car or truck and can cause the "check engine" light to turn on when there is a problem.
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 ...
ALDL is a proprietary system developed by General Motors for diagnostics and data link of emission control systems. It uses different connectors and data rates, and requires specific definitions of vehicle parameters and functions.