Diagnostic Communication Protocol (UDS)
Unified Diagnostic Services, a standard protocol for vehicle diagnostics.
UDS (ISO 14229) defines how external diagnostic tools communicate with ECUs. It enables reading fault codes, performing tests, and flashing new software. UDS messages operate over CAN, FlexRay, or Ethernet. Key services include data reading, control requests, and memory operations. This protocol underpins modern diagnostic tools and allows uniform access across different manufacturers. Secure extensions ensure that only authorized users can modify vehicle software.
Related Diagnostic Guide
This topic is part of CHEPQ’s system-level diagnostic framework.
For a broader understanding of how this component is analyzed in real-world diagnostics, refer to the following guide:
Applying This Knowledge in Practice
The diagnostic principles discussed above are commonly applied in real-world vehicle diagnostics. To put this knowledge into practice, explore professional automotive diagnostic tools designed to support system testing, fault analysis, and troubleshooting across modern vehicles.