What is an OBD fault?
1 Answers
OBD is the engine exhaust system fault indicator light. Relevant introductions are as follows: 1. Name: The full English name of OBD is On-Board Diagnostics, the on-board automatic diagnostic system. When the OBD fault light comes on, it indicates that the vehicle has an emission fault. 2. Working principle: OBD monitors whether the vehicle's exhaust exceeds the standard from the engine's operating conditions at any time. Once it exceeds the standard, it will immediately issue a warning. When the system fails, the fault (MIL) light or check engine (Check Engine) warning light comes on, and the powertrain control module (PCM) stores the fault information in the memory. The fault code can be read from the PCM through a certain program. 3. Components: The OBD device monitors multiple systems and components, including the engine, catalytic converter, particulate trap, oxygen sensor, emission control system, fuel system, EGR, etc. Therefore, it is a bit difficult to find the source of the fault to clear the OBD indicator light. The simplest method is to read the fault code, because OBD connects various emission-related component information to the electronic control unit (ECU), which has the function of detecting and analyzing emission-related faults. When an emission fault occurs, the ECU records the fault information and related codes. Therefore, by reading the fault code, the nature and location of the fault can be quickly and accurately determined.