Introduction To Unified Diagnostic Services (UDS) – AUTOSAR and MBD Explained
UDS Diagnostics & AUTOSAR Development Course
This course gives you a clear understanding of how diagnostics work in modern vehicles. It connects theory with practical implementation using AUTOSAR and Model-Based Development (MBD). You will learn how ECUs communicate, store, and clear faults through diagnostic protocols defined by ISO standards.
You start with the basics of vehicle diagnostics and the evolution from OBD-I and OBD-II to UDS. The course then explains how diagnostic messages flow between a tester and ECU, covering message formats, addressing modes, and transport protocol details.
You will explore UDS service formats and learn how each service is used in real ECU communication. Key services such as Diagnostic Session Control (0x10), Read/Write Data by Identifier (0x22, 0x2E), and Clear DTC (0x14) are explained with simple request-response examples.
You will understand how DTCs are stored, cleared, and linked with events and freeze frame data. Basic concepts of Security Access, ECU flashing, and unlocking diagnostic functions are also introduced to help you grasp real-world applications.
Next, you will learn about AUTOSAR Diagnostic Communication Manager (DCM) and Diagnostic Event Manager (DEM), including their configuration and interaction with CAN communication layers. This helps you understand how UDS is implemented within an AUTOSAR architecture.
Learn By using interective UDS Simulator
- UDS Simulator is an interactive web-based application for learning and testing Unified Diagnostic Services (UDS) based on the ISO 14229 standard.
- It provides a realistic ECU simulation with diagnostic sessions, Security Access, DTC management, DID operations, ECU flash programming and real-time communication monitoring, making it suitable for students, automotive engineers and embedded software developers.
Finally, you will apply your knowledge using MATLAB Simulink. You will create and simulate diagnostic models such as Read Data by Identifier, Write Data by Identifier, and Routine Control. The course concludes with testing concepts and MAAB modeling standards.
By The End Of This Course You Will Be Able To
- Explain how UDS works and why it is essential in modern ECUs.
- Identify AUTOSAR diagnostic components and their roles.
- Simulate diagnostic services in Simulink using MBD principles.
- Understand the workflow from fault detection to ECU reprogramming.
- Work confidently on diagnostic development, testing, and validation.
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COURSE SYLLABUS
UDS Diagnostics & AUTOSAR Development
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Module 1: Basics of Vehicle Diagnostics
- What is Vehicle Diagnostics
- Need for Diagnostics in ECUs
- Evolution of OBD-I, OBD-II and UDS
- ISO Standards Overview
- ISO 14229 – UDS
- ISO 15765-2 Transport Layer
- ISO 15031 OBD-II
- Role of UDS in Modern Vehicles
- ECU and CAN Communication Basics
Module 2: Diagnostic Communication Flow
- Tester-ECU Communication
- UDS Message Format
- Positive and Negative Responses
- Client Server Concept
- Functional and Physical Addressing
- CAN Frames and Transport Protocol
- Single Frame
- First Frame
- Consecutive Frame
- Flow Control
Module 3: Understanding UDS Service Format
- Service Identifier (SID)
- Sub Functions
- Request Response Examples
- Negative Response Codes (NRC)
- P2 and P2* Timing Parameters
- Session Switch Example
- DTC Read Example
Module 4: Commonly Used UDS Services
- 0x10 Diagnostic Session Control
- 0x11 ECU Reset
- 0x3E Tester Present
- 0x22 Read Data By Identifier
- 0x2E Write Data By Identifier
- 0x27 Security Access
- 0x31 Routine Control
- 0x14 Clear Diagnostic Information
- 0x19 Read DTC Information
Module 5: DTC and Event Handling
- DTC Structure and Format
- OBD-II vs UDS DTCs
- Freeze Frame Data
- Event Memory
- MIL Control Basics
Module 6: UDS Security Access
- Why Security Access is Needed
- Seed Key Concept
- Security Levels
- Unlocking Diagnostic Functions
Module 7: ECU Flashing
- ECU Flashing Basics
- Programming Workflow
- 0x34 Request Download
- 0x36 Transfer Data
- 0x37 Request Transfer Exit
- Calibration to Reprogramming Flow
Module 8: AUTOSAR and UDS Integration
- DCM Overview
- DCM Configuration
- DEM Overview
- DEM Configuration
- PduR Integration
- Com Integration
- CanIf Integration
- UDS Data Flow
Module 9: Model Based Diagnostics
- Simulink Diagnostics Modeling
- ReadDataByIdentifier Model
- WriteDataByIdentifier Model
- Routine Control Simulation
- MAAB Guidelines
- MIL SIL Testing Basics
Module 10: AUTOSAR Basic Architecture
- Application Scope of AUTOSAR
- Software Layers Overview
- Basic Software Layers
- MCAL
- ECU Abstraction Layer
- Complex Drivers
- Services Layer
- Runtime Environment (RTE)