BD is the abbreviation of English On-Board Diagnostics, and the Chinese translation is "Automatic Vehicle Diagnostic System".

This system will monitor the car's exhaust gas from the running condition of the engine at any time. If it exceeds the standard, it will immediately issue a warning.

When the system fails, the fault (MIL) light or the check engine (Check Engine) warning light is on, and the powertrain control module (PCM) stores the fault information in the memory, and the fault code can be read from the PCM through a certain program. . According to the fault code, the maintenance personnel can quickly and accurately determine the nature and location of the fault.

OBD is the abbreviation of English On-Board Diagnostic, translated into Chinese as "on-board diagnostic system".

This system monitors the engine's operating conditions and the operating status of the exhaust aftertreatment system at any time. Once it is found that it may cause excessive emissions, it will immediately issue a warning. When the system fails, the fault (MIL) light or the Check Engine warning light is on, and the OBD system stores the fault information in the memory. The standard diagnostic instrument and diagnostic interface can read the relevant information in the form of a fault code. . According to the fault code, the maintenance personnel can quickly and accurately determine the nature and location of the fault.

Since the 1980s, major automobile manufacturers such as the United States, Japan, and Europe have begun to equip their EFI vehicles with OBD. The initial OBD has no self-test function. The OBD-II, which is more advanced than OBD, was produced in the mid-1990s. The Society of Automotive Engineers (SAE) has developed a set of standard specifications that require automotive manufacturers to provide a unified diagnostic model in accordance with OBD-II standards in the 20th century. At the end of the 90s, cars entering the North American market set OBD according to the new standard.

The OBD-II differs from all previous in-vehicle diagnostic systems in that it is strictly targeted, and its substantial energy is to monitor vehicle emissions by monitoring the vehicle's power and emissions control systems. When the vehicle's power or emission control system fails, it may cause carbon monoxide (CO), hydrocarbon (HC), nitrogen oxides (NOx) or fuel evaporation to exceed the set standard, and the fault light will light up. .

OBDII features

1. The shape of the unified vehicle diagnostic seat is 16PIN.

2. There is a numerical analysis data transmission function (DATA LINK CONNECTOR referred to as DLC).

3. Unify the same fault codes and meanings of each vehicle type.

4. With driving recorder function. 

5. It has the function of redisplaying the memory fault code.

6. Has the function of clearing the fault code directly by the instrument.

Although OBD-II is very effective in monitoring vehicle emissions, it is “conscious” for drivers to accept warnings. For this reason, OBD-III, which is more advanced than OBD-II, has been produced.

The main purpose of OBD-III is to integrate the detection, maintenance and management of automobiles to meet the requirements of environmental protection. The OBD-III system will enter the engine, gearbox, ABS and other system ECUs (computers) to read the fault code and other related data, and use the small vehicle communication system, such as GPS navigation system or wireless communication method to identify the vehicle's identity code. The information such as the fault code and the location is automatically notified to the management department. The management department issues instructions according to the level of the vehicle's emission problem, including suggestions for where to repair, time limits for solving the problem, etc., and for those who violate the time limit. The vehicle issued a no-go command.

Therefore, the OBD-III system not only warns the driver of vehicle emissions, but also penalizes the offender. The application of the OBD system is an innovation in emission standards, and the correct functioning of its functions is important for the control of vehicle emissions.

  OBD application area

 The latest OBD product introduction can be applied to three fields: individual, enterprise and 4S shop.

 Individual users: easy to manage their own vehicles, easy to evaluate the vehicle and save costs; also increase the understanding of vehicle driving habits, safe operation skills, car knowledge and other content.

 Enterprise users: Enterprises are most concerned about cost and benefit, and care about the two parameters of “mileage” and “fuel consumption”. Using OBD products combined with L-ERP platform, it is convenient for enterprises to manage their own vehicles, save costs, and facilitate evaluation and assessment of drivers and vehicles. .

4S shop users: OBD can be installed on the user's vehicle to form a remote service diagnosis network. OBD can provide detailed vehicle data, thus enabling vehicle remote diagnosis services and improving the quality of service provided by enterprises to customers. When the user's car fails, the rescue personnel of the 4S shop can also obtain the real-time location information of the faulty vehicle from the L-ERP platform, and promptly and accurately rush to the on-site service.