Diagnosing Network Communications: Module 3

Diagnosing Network Communications – Module 3 brings the diagnostic process to the physical layer, showing technicians how to confirm network integrity through targeted electrical testing and oscilloscope analysis.

Building on the network design and diagnostic strategy covered in the first two modules, this final lesson focuses on proving diagnostic conclusions through direct measurement. Technicians learn how to interpret CAN and CAN FD waveforms, evaluate bus voltage and resistance, confirm termination, and recognize abnormal signal behaviour caused by opens, poor connections, noise, or module-related faults.

The module also covers wake-up and sleep behaviour, parasitic network faults, LIN bus operation, and the importance of tracing information flow between modules, sensors, and control systems before isolating a fault.

With focused coverage of scope-based testing, physical-layer verification, and real-world waveform interpretation, this module helps technicians validate repair decisions, isolate wiring and network faults more accurately, and complete network communication diagnosis with greater confidence.

Diagnosing Network Communications: Module 2

Diagnosing Network Communications – Module 2 shows technicians how to approach communication faults in a structured, repeatable way so they can avoid misdiagnosis and make better decisions early in the diagnostic process.

As modern vehicles rely on multiple networks, gateways, and shared data between control modules, it becomes increasingly important to interpret fault information correctly before moving into physical testing.

This lesson explains how U-codes should be understood in context, how topology views and wiring diagrams can be used to confirm which modules should be online, and how data paths can be traced through the network to identify where communication is being lost.

It also shows technicians how network architecture affects testing strategy, including when voltage and resistance checks at the DLC are useful, when gateway design changes what the readings mean, and why power, ground, and bus integrity must be verified in the proper order.

With focused coverage of diagnostic sequence, physical-layer testing, and real-world case studies, this module helps technicians diagnose network communication faults more accurately, avoid unnecessary module replacement, and work through complex vehicle network problems in a logical, methodical way.

Test Kev Course: Module 1

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