What Causes No Power in the OBD Port?
1 Answers
When the OBD diagnostic port in a car has no power, the reason is usually a blown power supply fuse. Below is a detailed introduction about the OBD system: Definition: OBD stands for On-Board Diagnostics, which translates to a detection system extended for automotive fault diagnosis. Working Principle: The OBD system continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, it immediately issues a warning. When a system malfunction occurs, the Malfunction Indicator Lamp (MIL) or Check Engine warning light will illuminate. At the same time, the Powertrain Control Module (PCM) stores the fault information in memory. Through a specific procedure, the fault code can be read from the PCM. Based on the fault code, maintenance personnel can quickly and accurately determine the nature and location of the fault. Scope of Monitoring: OBD monitors the engine, catalytic converter, particulate filter, oxygen sensors, emission control system, fuel system, EGR, and other related components in real-time. It then connects this information related to emissions to the Engine Control Unit (ECU).