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

Test Kev Course TEST

Diagnosing Network Communications: Module 1

Diagnosing Network Communications – Module 1 gives technicians the foundation they need to make sense of modern vehicle networks and approach communication faults with greater confidence.

As vehicles continue to add modules, gateways, and multiple communication protocols, understanding how the network is designed becomes essential to accurate diagnosis.

This lesson explains how vehicle networks are structured, how common protocols such as CAN, CAN FD, LIN, and Automotive Ethernet are applied, and how gateway modules manage communication between different networks.

It also shows technicians how to use wiring diagrams and scan tool topology views to understand module relationships and network design before moving into deeper diagnostic work.

With focused coverage of CAN bus operation, arbitration, and basic electrical behaviour, this module prepares technicians to understand network activity more clearly and begin diagnosing communication faults in a logical, methodical way.