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AUTOMOTIVE NETWORKS · GOTECH

CAN bus explained

CAN stands for Controller Area Network. It lets vehicle control modules exchange information. To diagnose a communication fault, first identify which network and connections are involved.

Understand CAN communication →Diagnosing a fault? Start with the case →

Three original GoTech videos, written explanations and diagrams. Start wherever you need help.

CHOOSE YOUR STARTING POINT

What are you trying to understand?

Understand the communication path, interpret the wiring, or follow a real diagnosis. Each page stands on its own.

CONCEPTUAL EXAMPLE — NOT A VEHICLE WIRING DIAGRAM

A scan response does not clear the whole vehicle

Lines show communication relationships, not conductors. The response establishes enough operation for that exchange—not complete health of every item on the path.

Read the diagram in words

A scan tool connects through the DLC and a gateway to two conceptual branches. Module A responds over Path A, shown with solid lines. Path B to Module B is dashed: its condition is not established by that response.

08:00–10:55 · CAN Bus Communication Explained (Part 1) 15:25–18:05 · CAN Bus Communication Explained (Part 1)
Understand the scan path →
Does 60 ohms mean the network is good? Does communication prove a repair? What does one voltage reading leave unknown?

New to wiring diagrams? Start with the wiring foundations →

Sources and scope

The definition of CAN follows Texas Instruments’ introduction to CAN (PDF). The diagram and cases come from GoTech’s original CAN series; source moments are linked beside each explanation. The diagram shows communication relationships, not a vehicle’s wiring or a test procedure.

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