Mechanics who inspect and repair vehicles require skills that include knowledge and understanding of how to use OBD diagnostics, specifically for carrying out effective troubleshooting and verifying the vehicle’s roadworthiness following completion of emissions related diagnostic repairs.

Learning Outcome

As your expertise improves, so too do your skills and abilities in performing fault diagnosis demanding logical reasoning and analysis of test results. You will be able to make effective use of all possible information stored in the engine control module’s OBD memory about faults and system status.

What You Will Learn?

Utilisation of OBD diagnostic functions requires understanding of how the testing device you use provides information about the operating modes defined in the standard. For example, data on fault codes, condition and freeze frame data, and code deletion are stored in a variety of functional modes. The testing device's view may be in the mode appropriate for the function, and so you have to visit multiple views to gather all the information, or alternatively the same information may be merged into a single view.

In diagnostics, the fault code becomes specified according to how the malfunction affects the data received from the signal, current or function. You can make use of the qualifier of this if you understand the structure of the circuitry and how it works. By utilising the basic skills of electrical engineering and your knowledge of the system, you begin to understand things like how the weakening of supply voltage in signal monitoring can affect its grounding from short circuiting.

Study Material

  • Basics of self OBDII EOBD Diagnostics
  • EOBD OBDII System
  • Component Diagnostics
  • System Diagnostics
  • Assessments
  • Final Exam


To get the best possible learning outcome, you will need to have a basic knowledge in electricity and electronics. Or have taken Electronics Module

System Requirements

Internet connection with PC or laptop. Recommended screen resolution 1024 x 768 or higher.


After completing your studies and appropriately completed assignments, you will complete the final exam. After completing the final test, you can print a Prodiags certificate from your performance record to mark your expertise.


Learn EOBD/OBDII diagnostics basics
Online access Study at your own time & pace
Module requires 2 day training event
License valid for 6 months
Requires a basic knowledge in electricity and electronics
Course provider: PRODIAGS
Module requires 2 day training event
Course access starts 1-2 business days after payment
License valid for 6 months
Requires a basic knowledge in electricity and electronics

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