What is the function of the car OBD interface?
2 Answers
OBD is the abbreviation of On-Board-Diagnostic, which translates to "On-Board Diagnostic System". This system continuously monitors the operating conditions of the engine and the working status of the exhaust after-treatment system. Once it detects a situation that may cause excessive emissions, it will immediately issue a warning. The OBD interface in cars mainly has four functions: 1. Display of engine control unit data: The OBD interface can provide various operational data of the vehicle, such as data displayed on the vehicle dashboard, various fuel consumption records, battery voltage, air-fuel ratio, throttle opening, knock count, etc.; 2. Reading fault codes: The OBD interface can be used to read fault codes, which helps in quickly diagnosing vehicle faults and reduces the time required for manual diagnosis; 3. Changing codes to enable more functions: By connecting the vehicle's CAN bus via the OBD interface data cable and adjusting the codes of various modules, many different "hidden" functions can be enabled, achieving "additional configurations"; 4. Reading and flashing ECU-TCU programs: This allows manufacturers to update the ECU control programs at any time, but it is not recommended to modify them by oneself.
When repairing cars, I often use the OBD interface, which is like the vehicle's 'health check port.' By plugging in a diagnostic tool, I can read fault codes from the engine and transmission. For example, if the engine light is on, it might indicate an issue with the oxygen sensor or ABS, helping quickly pinpoint the problem and avoid major repairs. OBD also monitors the emission system, aiding in environmental tests. Car owners can purchase a scanner themselves to check, saving money and hassle. Paying attention to OBD error codes during daily driving can prevent minor issues from turning into major faults. I recommend regular checks to maintain stable vehicle performance, enhance safety, and extend lifespan.
