Which OBD port connects to the positive and negative terminals?
1 Answers
OBD interface generally has the inner core wire connected to the positive terminal and the outer core wire connected to the negative terminal. OBD, or On-Board Diagnostics, is a system that monitors vehicle operating conditions and provides timely feedback on abnormalities, primarily focusing on the engine status and exhaust conditions of the vehicle. Below is an introduction to OBD: Functions of the 9 wires in the vehicle's OBD port: Among them, four wires are related to the vehicle's ECU: one is ECUCANH, one is ECUCANL, one is ECUK line, and another is the computer memory recovery line. Additionally, two wires in the vehicle's OBD are the ground and power lines provided by the vehicle itself. The other three wires are the vehicle's transmission communication line, instrument panel communication line, and body communication line, etc. Common functions of OBD: Continuously monitor the faults of components and systems to ensure that the vehicle's emissions do not exceed the requirements of OBD regulations during its service life; when detecting relevant emission faults, the OBD system can alert through the MIL light on the dashboard; faulty vehicles can be repaired promptly to reduce emissions; the OBD system helps technicians quickly diagnose and perform targeted repairs, lowering maintenance costs.
