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CAN DATABUS

This seminar covers CAN-bus system layout and packet construction, in-depth diagnostics, ECU internals and practical faults. This training is fast paced and is especially for diagnostic experts.

  • CAN-DATABUS
CANDATA training
QUICK FACTS

COURSE ID: CAN1-1
DURATION: 1 DAY

Prerequisites: It is prefered that you have completed AED, no matter what level of experience or previous training systems.
Equipment: This training is scope based, please bring your own scope or if you don’t have one AECS will provide one for you.

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  • PATHWAY TO YOUR NEXT TRAINING

COURSE ID: EMS1-6

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Quick Overview

  • We examine how CAN signals are produced by understanding for example, what the CPU "sees" instead of just looking at the voltages measured on the bus which is important during diagnostics. We'll discuss the practical implications and the data analysed during the seminar and relate it to workshop situations.
  • Prioritisation of the CAN data messages between ECU’s is explained in detail, right down to the hardware switching and voltage levels.
  • The ACK pulse is explained in detail and what happens when it is missing, allowing you to instantly recognise when a signal on a CAN data network is incorrect.
  • We will teach you how to understand where CAN data messages originate from and why you may see live-data lines repeated in some ECUs.
  • In this seminar, you'll go beyond the theory to learn practical insights that can be applied to your workshop right away.

Comprehensive Overview

Diagram taken from CAN Databus training

CAN-bus Background
In this training we will start with the CAN-bus packet.  This is broken down into its individual components and explained. Terms such as identifier bits, EOF and CRC are explained in depth. Individual parts of the CAN-bus packet are recorded and analysed with the ATS Scope.

We look at how CAN signals are produced by looking at the internal construction of the ECU and also what the CPU “sees” this is very important during diagnostics.

ECU Priority on CAN 
Many different ECUs in modern vehicles all have something to say, what determines who gets to talk first? This is where we will give you a detailed understanding of CAN prioritisation. This topic is covered in great detail, right down to the hardware switching and voltage levels.

Acknowledge 
All ECUs on the bus share data. How does the transmitting ECU know that the data is received correctly? Diagnostically we will look at what happens when this ACK pulse is missing and how it is generated.

automotive communications

CAN-bus Data 
CAN-bus data is what it is all about, however little can be changed to the data provided from the inputs to the relevant ECUs and the BUS is in correct working order. This part of the training covers why you see live-data lines repeated in some ECUs, where the data originates from and redundancy calculations.

Real Failures 
Lastly in this training, we keep it practical by giving you true to life CAN Databus failures. Using the insights, knowledge and information learnt from the training you will be able to cement your learning by analysing and diagnosing these problems in detail. 

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