What is the definition of a car OBD interface?

1 Answers
DiCaden
07/29/25 3:54pm
The definition of a car OBD interface is the On-Board Diagnostics system. This system continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed the standard. If they do, it will immediately issue a warning. When a fault occurs in the system, the malfunction indicator lamp or check engine warning light will illuminate, and the powertrain control module will store the fault information in the memory. Through a specific procedure, the fault code can be read from the PCM. The working principle of the OBD interface: OBD monitors the engine, catalytic converter, particulate filter, oxygen sensor, emission control system, fuel system, EGR, and other systems and components in real-time, then connects the information related to different emission components to the ECU.
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