UDS service development
Implement and refine diagnostic request flows for DID access, diagnostic session handling, routine control, security access integration, and response interpretation within the agreed ECU scope.
Vehicle Diagnostics
UDS Diagnostic Development
Develop, test, and troubleshoot diagnostic communication for ECUs using UDS, ISO-TP, DoIP, ODX data, CANoe, CAPL, and focused engineering analysis.
Discuss a UDS ProjectProblems I can investigate
Find the behavior behind the symptom
- 01
ECU not responding
Systematically check the diagnostic path when an expected ECU does not answer requests, including transport setup, addressing assumptions, session state, and evidence from available recordings.
- 02
UDS request fails
Analyze why a request does not reach the expected positive response, separating data-definition issues, diagnostic session conditions, timing behavior, and implementation defects where evidence allows.
- 03
Unexpected UDS negative response
Review the request sequence, diagnostic session, security access state, DID usage, and routine control flow to explain negative responses without assuming OEM-specific behavior.
- 04
DTC keeps returning
Investigate recurring DTC behavior using available diagnostic data, request traces, ECU observations, and reproduction context to support a cautious technical finding.
What I can help with
Focused engineering work in Vehicle Diagnostics
CAN and IP diagnostic transport integration
Support diagnostic communication over CAN with ISO-TP and over DoIP, aligning transport behavior with the diagnostic flow and available ECU interface assumptions.
ODX and PDX diagnostic data use
Use ODX or PDX inputs to map DIDs, DTCs, sessions, and service parameters into executable diagnostic behavior or review mismatches between data and ECU responses.
CANoe and CAPL automation
Extend an existing CANoe project with CAPL scripts for repeatable diagnostic requests, response checks, setup actions, and traceable test execution.
DCM integration support
Assist teams integrating diagnostic behavior around the DCM, including service availability, diagnostic session handling, and interface-level fault isolation.
Trace-based diagnostic troubleshooting
Analyze BLF recordings and observed request sequences to identify plausible causes of failed responses, unexpected negative responses, or recurring DTC behavior.
What to send
Start with the evidence you already have
ECU
A communicable ECU for direct testing, reproduction, or comparison against recorded behavior.
ODX
Diagnostic-data description used to derive DIDs, DTCs, sessions, service parameters, and expected interpretation.
PDX
Packaged ODX data for import, review, or use in diagnostic application and test development.
BLF recording
Timestamped bus communication for evidence-based analysis of requests, responses, timing, and transport behavior.
Existing CANoe project
CANoe configuration and project assets to extend with diagnostic automation or CAPL behavior.
Problem description
Observed symptoms, context, reproduction steps, and expected behavior so the diagnostic scope can be bounded.
How the analysis works
From recorded data to engineering findings
- 01
Scope the diagnostic target
Confirm the ECU, transport path, available diagnostic data, observed problem, expected behavior, and deliverable format before implementation or analysis begins.
- 02
Review data and communication evidence
Inspect ODX or PDX content, existing CANoe assets, BLF recordings, and the reported UDS flow to identify constraints and likely investigation paths.
- 03
Implement or adapt diagnostic behavior
Build the diagnostic application logic, automated checks, or CAPL scripts needed for the agreed requests, sessions, DIDs, DTCs, and routines.
- 04
Exercise and debug the flow
Run focused tests against the available ECU or recordings, compare actual responses with expected behavior, and refine the implementation where defects are confirmed.
- 05
Document findings and handover
Deliver the agreed software or analysis with assumptions, evidence, unresolved questions, and practical next engineering steps.
What you receive
Deliverables matched to the investigation
Diagnostic application
Software for executing selected ECU diagnostic services, interpreting responses, and supporting repeatable engineering use within the agreed scope.
Automated test suite
Executable diagnostic tests with setup, assertions, and repeatable results for the selected ECU behavior or diagnostic flow.
CAPL script
CAPL source that extends CANoe behavior for diagnostic requests, checks, automation steps, or focused troubleshooting.
Engineering analysis
Documented technical findings based on supplied data, recordings, reproduction context, and observed diagnostic communication.
Technologies & formats
Automotive data and analysis environments
- UDS
Unified Diagnostic Services
ISO 14229 diagnostic services for communicating with vehicle ECUs.
- ISO-TP
ISO 15765-2 Transport Protocol
A segmented transport protocol for messages carried over CAN.
- DoIP
Diagnostics over Internet Protocol
Diagnostic transport over IP networks as defined by ISO 13400.
- ODX
Open Diagnostic Data Exchange
An ASAM model for machine-readable ECU diagnostic data.
- DTC
Diagnostic Trouble Code
A coded diagnostic record identifying a detected fault condition.
- DID
Data Identifier
A UDS identifier addressing diagnostic data exposed by an ECU.
- Diagnostic Session
Diagnostic Session
An ECU diagnostic operating mode controlling service availability and timing.
- Routine Control
Routine Control
The UDS service used to start, stop, or request results from ECU routines.
- Security Access
Security Access
A diagnostic challenge-response mechanism that unlocks protected ECU services.
- CANoe
Vector CANoe
A development, simulation, test, and analysis environment for vehicle networks.
- CAPL
Communication Access Programming Language
Vector event-driven language for network simulation, testing, and automation.
- DCM
Diagnostic Communication Manager
The Classic AUTOSAR basic-software module handling diagnostic communication.
- CAN
Controller Area Network
A priority-based broadcast bus used for in-vehicle control communication.
FAQ
Practical questions before an investigation
- Can this service start from only a BLF recording and a problem description?
- Yes, if the recording contains enough relevant communication. The result may be an engineering analysis rather than a confirmed fix when ECU access or diagnostic data is not available.
- Can you work with ODX or PDX data?
- Yes. ODX or PDX inputs can be used to derive diagnostic behavior, check DID and DTC interpretation, and compare expected diagnostic flows with ECU responses.
- Do you support both CAN and DoIP diagnostics?
- Yes. The service can cover UDS over CAN using ISO-TP and UDS over DoIP, depending on the available ECU, project assets, and test environment.
- Can you modify an existing CANoe project?
- Yes. When an existing CANoe project is provided, CAPL scripts and diagnostic automation can be added or adjusted for the agreed workflow.
- Do you guarantee the root cause of a diagnostic issue?
- No. Diagnostic work is evidence-based. The service aims to isolate plausible causes, confirm defects where possible, and document remaining assumptions or missing data.
Discuss the evidence
Discuss a UDS Diagnostic Development Project
Share the ECU context, ODX or PDX data if available, any BLF recording, and a short problem description. I can then suggest a focused diagnostic development or analysis scope.