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CAN Bus Communication Explained (Part 1)

GoTech2023-05-18
CAN Bus#CAN Bus Communication#No Communication#U codes#U1000#U1001#communication networks#Low speed CAN#High Speed CAN#Scanner will not communicate#CAN Bus Protocol#DLC pins 6 14
190K views|1 years ago
💫 Short Summary

The video discusses the evolution of car communication networks, emphasizing the importance of understanding network structure, protocols, and testing methods. It highlights the transition from simple one-wire networks to collaborative systems in modern vehicles. Real-world examples and case studies are used to demonstrate the significance of breaking down complex networks for effective diagnostics. The importance of segmenting networks for improved diagnosis and maintenance is stressed, along with the necessity of addressing all symptoms for successful diagnosis and repair. The video promotes a detailed analysis of car communication systems for accurate troubleshooting.

✨ Highlights
📊 Transcript
Importance of practical diagnostics in Can bus communication.
00:00
Emphasis on understanding network structure, protocols, and testing methods from real-world scenarios.
Class divided into communication networks, network topology, protocols and languages, and network testing.
Significance of breaking down complex networks for effective diagnostics.
Use of a 2021 Cadillac Escalade as an example to illustrate modern network intricacies and strategic testing approaches.
Importance of understanding communication networks in modern vehicles.
03:44
Older vehicles had redundant systems, while newer vehicles require modules that can share information.
Modules sharing data on a network is highlighted as a simple form of a network.
Modules in vehicles now work together to create systems, such as ABS and powertrain control modules teaming up to create traction control systems.
Evolution from simple networks to collaborative systems like park assist is emphasized.
Evolution of car communication networks.
08:19
The segment explains the progression from simple one-wire networks to modern, complex systems.
Different modules communicate within the network to ensure proper car functioning, such as radar modules interacting with ABS modules and engine control modules.
Gateway modules act as interpreters for various network languages.
Understanding and diagnosing different networks within a car's communication system is crucial for effective troubleshooting.
Importance of breaking down communication issues in a car network for successful diagnosis.
12:03
Case study of a 2021 Cadillac Escalade with a fuel pump control module communication problem.
Technician initially found no issues with the network but later discovered a DTC code indicating a communication problem.
Emphasis on starting with a wiring diagram and checking power and ground connections for troubleshooting network problems in vehicles.
Understanding network diagnostics in automotive systems.
16:03
Importance of checking power, ground, and communication lines in diagnosing networks.
Emphasizing the significance of identifying the Serial Gateway module and communication lines.
Not relying solely on traditional DLC testing methods for accurate results.
Stressing the complexity of network diagnostics and the need for detailed analysis.
Importance of breaking down network communication before testing in car modules.
17:30
Just because modules can communicate doesn't mean there are no issues.
Understanding data lines and protocols for car diagnostics is crucial.
Visual inspection is highlighted through a case of chewed wires.
Simplifying network diagnostics to promote success in troubleshooting car issues.
Importance of dividing communication networks for sensors and modules.
21:55
Issues with modules or wiring can disrupt the entire network, leading to diagnostic challenges.
Segmenting networks makes it easier to identify and address faulty components.
Real-world examples, like a window switch shorting out due to spilled coffee, highlight the impact of network design on system reliability and fault tolerance.
Speaker emphasizes the benefits of sectioning off networks for improved diagnosis and maintenance.
Diagnosing a no start issue in a 2013 GMC Acadia with intermittent symptoms.
23:46
Despite stored codes from the factory, the customer did not care about other symptoms leading to the car breaking down later.
The issue was traced to the PCM not commanding the starter on, with all wiring appearing fine initially.
This case study highlights the importance of addressing all symptoms and not neglecting potential warning signs for a successful diagnosis and repair.
Analysis of network problem into high-speed and low-speed networks.
25:55
High-speed network includes engine control, transmission control, and body control modules.
Low-speed network compared to a 'house of cards' with various modules.
Communication issues within the networks identified as cause of network being down.
Importance of understanding network structure and communication languages emphasized for troubleshooting.
Ongoing issue with object detection modules in GM vehicles.
29:41
Water, mud, and corrosion found in the module causing electrical issues.
GM attempts fixes such as adding grease or sealing vent holes, but problem persists.
Importance of using scan tool to diagnose quickly and understanding wiring diagrams.
Issue reflects larger systemic problem within GM's manufacturing process.
Breakdown of car network modules for easier diagnosis.
32:30
Key components are isolated to prevent system failure.
Segmenting the network makes diagnosing issues more manageable.
Importance of understanding testing locations and purposes.
Comparison to map reading and effectiveness for successful diagnosis.