Design, implementation and testing of OBD-II functionality for an Engine Control Unit (ECU) to support external access to fault code memory and other emission relevant data.

1. Embitel Technologies International presence:
OBD2 Software Development and Testing

2. Embitel Technologies International presence:
OBD or On-Board Diagnostics refers to a system for emission control which has the capability to detect a
malfunction and to store the related information in non-volatile memory.
The OBD system monitors the emission relevant components or systems, stores detected malfunctions
indicating likely area of malfunction and activates Malfunction Indicator Lamp (MIL) if necessary.
The Objectives of OBD regulation are:
• To improve in-house emission compliance by alerting the vehicle operator when a malfunction exists
• To aid automobile repair technicians in identifying and repairing malfunctioning systems in the
emission control system.

3. Embitel Technologies International presence:
OBD diagnostic interface refers to functionally addressed request/response messages to
access the OBD relevant information from the vehicle using a generic OBD scan tool.
Requirements:
The scope of the project was to design, implement and test OBD-II functionality in an
Engine Control Unit. The scope of the project covered the following modules.
• Diagnostic System Manager (Diagnostic Manager and Fault Code Memory) – On
board diagnostic functionality to detect and store malfunctions
• OBD Diagnostic Interface – To provide external tester access to stored OBD data

4. Embitel Technologies International presence:
System Overview
.
DSM – Diagnostic System Manager
The DSM collects the test results reported by the monitoring functions. The current fault states and the
derived error memory entries are available in standard form for the application software and the Tester
communication.

5. Embitel Technologies International presence:
This module supports external access to fault code memory and other emission relevant data. A generic
OBD scan tool can be connected to the ECU to read emission relevant data. The following Diagnostic
services or OBD modes were supported.

6. Embitel Technologies International presence:
OBD Diagnostics Interface
• Request current powertrain diagnostic data $02 Request powertrain freeze frame
data
• Request emission-related diagnostic trouble codes
• Clear / Reset emission-related diagnostic information
• Request on-board monitoring test results for specific monitored systems
• Request emission-related diagnostic trouble codes detected during current or last
completed driving cycle$09 Request vehicle information

7. Embitel Technologies International presence:
• Analysis of standard and OEM specific OBD requirement
• Design and development of Fault code memory
• Design and development of Diagnostic manager
• Implementation of OBD services as per ISO15031-5
• Integration of OBD modules with other ECU modules
• Standard QA practices were followed to ensure quality of deliverables
• Standard Testing practices including Unit testing, Integration testing etc
• MISRA compliance
Implementation

8. Embitel Technologies International presence:
• PowerPC controller based ECU
• Trace32 debugger
• SamDia software and HS+ Interface for simulating diagnostic tester
• PC-Lint for static analysis
To know more about our OBD2 Software Development and services, mail to sales@embitel.com
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