Diagnostic systems have become increasingly important throughout the automotive development chain, for instance in ECU software development. This presentation illustrates the increasing requirements for development tools regarding different diagnostic standards. The presentation was held by Hans-Joachim Schleissheimer, CEO of Schleissheimer GmbH, at the 9th CTI forum “Automotive Diagnostic Systems” (Stuttgart, March 13-14, 2012).

1. 9th International CTI Forum
The Relevance of Diagnostics
in Automotive Development
• Increased requirements for development tools in
diagnostics, complex bus communication and analysis.
• Concept of a manufacturer-independent tool landscape.
Hans-Joachim Schleißheimer
CEO Schleißheimer GmbH

2. What is Diagnostics?
• Automotive diagnostics is:
– Information exchange between vehicle
electronics and testing devices.
– Used comprehensively during the complete
product cycle.
– Relevant to all ECUs and numerous testing
systems.
– Mainly a software feature.
– Not visible to customers.

3. What is Diagnostics?
• Vehicle diagnostics is the “adjustable
wrench” of our tool collection.

4. What is Diagnostics?
• On-board diagnostics
– Built-in software functions of ECUs, used for self-
diagnosis and to monitor sensors and actuators.
• Off-board diagnostics
– Specific diagnostic devices (testing tools)
combined with measurement technology,
remaining bus simulation and databases.

5. Application
Development Validation Production Field
• Each phase of the product cycle has specific
requirements on diagnostics.

6. Requirements
Field •OBD (1988) (emission control)
•Service (repair shop testing devices)
Production •Checking, encoding
•Testing during assembly (integration)
Validation •Validating vehicle functions (HIL)
Development •Creating/validating individual functions
•White-box software tests
(free access of variables, event tracing)

7. Topology
• Layer model
Application protocols
Application (7..5) OBD (US, EU), KW2000, UDS,
CCP, XCP, ...
Transfer layer
Protocol (4..3) ISO-TP, TP1.6, TP2.0, J1939,
FlexRay-TP, ...
Physical layer
Transport (2..0) UART, CAN, TTC, VAN , LIN, CCD,
FlexRay, MOST, Ethernet....
The layers must match between the testing device and the ECU; they are the basis
of all communication between testing device and ECU.

8. Variety
• Transport layer
– High degree of variety; required to use
diagnostics on available busses.
• Protocol layer
– Required in some cases; varied manufacturer-
specific requirements.
• Application layer
– Progress (OBD, KW2000, UDS).
– Increased requirements in development
(UDS XCP).

9. Diagnostics in ECU Development
• KWP/UDS is available in nearly every
project.
• XCP is seldom available, but better suited to
development purposes, because:
– XCP is faster due to reduced protocol overhead.
– XCP offers improved access to internal data:
• Scalable variables (A2L)
• Bypass capability
• Event availability

10. Future XCP Developments
• Variable description
– Description and declaration are inconsistent.
Consistent description and declaration of
variables inside the code or inside the
configuration. Check and automatic generation of
A2L files during code creation.
• Events
 Not only measurements, but events and their
descriptions.

11. Future UDS Developments
• Adoption of XCP functionality
(free variable access, scaling definitions in A2L
files, events)
• Variable increase of bandwidth
(reduced timings as required )
 Merging of UDS and XCP

12. Future Tool Developments
• Simultaneous recording of bus
communication, values of variables and state
changes in one log file.
• Display of variables and events in physical
values or clear text.

13. Benefits for Development
• Very good basis for software testing.
• Improved analysis capabilities.
• Considerably improved testing and analysis
even in production devices.

14. Contact
Schleißheimer Soft- und
Hardwareentwicklung GmbH
Am Kalkofen 10
D-61206 Nieder-Wöllstadt
Phone: +49 6034 9148-701
Fax: +49 6034 9148-91
vertrieb@schleissheimer.de
www.schleissheimer.de
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