DID behavior development
Define and implement focused DID read behavior for ECU diagnostic communication, including the expected data representation and diagnostic flow.
Vehicle Diagnostics
Develop UDS Data Identifier handling
DID development implements the agreed request and response behavior for ECU data access. I align data definitions, access conditions, application logic, and tests, with ECU-side changes scoped to the source and integration interfaces your team can provide.
Discuss DID DevelopmentProblems I can investigate
Find the behavior behind the symptom
- 01
Unexpected UDS negative response
An ECU returns a negative-response code inconsistent with the expected diagnostic flow. The work isolates the relevant diagnostic session, DID behavior, and available diagnostic data description to narrow the cause.
- 02
DID read failure
A diagnostic data identifier cannot be read or returns invalid data. Analysis can compare the ECU behavior with the expected data definition and test the read path across the available diagnostic transport.
What I can help with
Focused engineering work in Vehicle Diagnostics
Diagnostic data description alignment
Review ODX and PDX content against the intended DID behavior, identifying mismatches that can affect diagnostic application interpretation or testing.
Transport-aware diagnostic testing
Exercise DID access over ISO-TP or DoIP and capture repeatable results for supported diagnostic communication paths.
Diagnostic application and test automation
Build diagnostic application logic and automated tests for DID requests, responses, expected values, and negative-response handling.
Diagnostic flow analysis
Analyze diagnostic session behavior and, where relevant, the interaction of DID access with routine control or security access without assuming ECU-specific behavior.
What to send
Start with the evidence you already have
ODX
An ASAM diagnostic-data description used to compare DID definitions, data representation, and expected diagnostic behavior.
PDX
A packaged exchange containing ODX diagnostic data and related assets.
ECU
An electronic control unit available for communication or testing, with the relevant access conditions identified by the client.
Problem description
Include the intended DID behavior and available source/build access. ECU-side implementation requires the relevant diagnostic integration interfaces; client-side tooling can be scoped separately.
How the analysis works
From recorded data to engineering findings
- 01
Review the diagnostic definition
Examine the supplied ODX or PDX data, ECU context, and problem description to establish the intended DID behavior and diagnostic flow.
- 02
Trace the read path
Analyze DID access through the applicable diagnostic session and transport, separating data-definition issues from observed ECU responses.
- 03
Develop the required capability
Implement focused diagnostic application logic, test support, or ECU-side DID behavior within the agreed scope.
- 04
Exercise expected and failure cases
Run repeatable checks for valid DID reads, invalid data, and unexpected UDS negative responses using the available ECU and communication setup.
- 05
Document findings and hand over
Record evidence, observed behavior, remaining uncertainties, and the resulting software or test assets.
What you receive
Deliverables matched to the investigation
Diagnostic application
Software for executing and interpreting ECU diagnostic services, including the agreed DID access and result handling.
Automated test suite
Executable tests with setup, assertions, and repeatable results for DID reads and relevant diagnostic responses.
Engineering analysis
A documented technical analysis with evidence and findings covering the observed DID behavior, diagnostic flow, and identified discrepancies.
Technologies & formats
Automotive data and analysis environments
- DID
Data Identifier
A UDS identifier addressing diagnostic data exposed by an ECU.
- UDS
Unified Diagnostic Services
ISO 14229 diagnostic services for communicating with vehicle ECUs.
- ODX
Open Diagnostic Data Exchange
An ASAM model for machine-readable ECU diagnostic data.
- 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.
- DTC
Diagnostic Trouble Code
A coded diagnostic record identifying a detected fault condition.
- 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.
- PDX
Packed ODX Exchange
A distributable package containing related ODX documents and assets.
FAQ
Practical questions before an investigation
- What information is needed to implement a new DID?
- Define the identifier, data source, payload layout, conversion, availability conditions, and expected error behavior. Client-side handling and ECU-side implementation are separate deliverables. ECU changes also require the relevant source access, build environment, and diagnostic integration interfaces.
- Can you develop a new DID as well as investigate a failed read?
- Yes. The scope can cover DID behavior development, analysis of an existing DID read failure, or both, based on the supplied ECU context and diagnostic data.
- Can the work use ODX and PDX data?
- Yes. ODX and PDX can be reviewed against the intended DID behavior and used to support diagnostic application development and automated testing.
- Can DID behavior be tested over ISO-TP or DoIP?
- Yes, where the required communication path and ECU are available. The test scope can cover ISO-TP, DoIP, or the applicable supported path.
- Will the analysis guarantee the root cause?
- No. Findings will be based on the supplied data, reproducible observations, and available ECU behavior, with remaining uncertainty stated explicitly.
Discuss the evidence
Discuss DID Development
Share the ODX or PDX data, ECU access details, and a short problem description to scope the DID work.