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Airam Rojas Zerpa
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Caterpillar Electronic Technician (CAT ET) 2021A: The Ultimate Diagnostic Software for Cat Engines and Machines


What is CAT ET 2021A and why you need it?




If you own or work with Caterpillar engines or machines, you know how important it is to have a reliable diagnostic tool that can help you communicate, diagnose, and service them. That's where CAT ET 2021A comes in.


CAT ET 2021A is the latest version of Caterpillar Electronic Technician (CAT ET), a diagnostic software that allows you to connect to an electronic control module (ECM) of a Caterpillar engine or machine and perform various tasks, such as:




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  • Viewing live data and parameters



  • Reading and clearing diagnostic codes



  • Configuring and calibrating settings



  • Performing tests and simulations



  • Obtaining data logs and reports



CAT ET 2021A is compatible with Caterpillar ET 3 devices and other hardware devices that can communicate with Cat Data Link protocols. It supports multiple languages, such as English, Chinese, Danish, French, German, Italian, Japanese, Portuguese, Russian, and Spanish.


CAT ET 2021A is designed to help you improve the performance, efficiency, and safety of your Caterpillar engines or machines. It can help you identify and fix problems quickly, reduce downtime and maintenance costs, optimize fuel consumption and emissions, and enhance operator comfort and productivity.


In this article, we will show you how to download and install CAT ET 2021A on your computer, how to use it to connect to an ECM and perform diagnostics and troubleshooting tasks, and what are the benefits of using it.


How to download and install CAT ET 2021A?




Download the software from a reliable source




The first step is to download the software from a reliable source. You can either visit the official website of Caterpillar or a trusted online store that sells CAT ET software.


For example, you can download CAT ET 2021A from , which offers installation and activation service for one laptop by Teamviewer. You can also choose from other versions of CAT ET software, such as CAT ET 2022A or CAT ET 2023A.


Install the software on your computer




The next step is to install the software on your computer. To do that, you need to follow these steps:


  • Extract the downloaded file to a folder on your computer.



  • Open the folder and run the setup.exe file as administrator.



  • Follow the instructions on the screen to complete the installation process.



  • Copy the patch files from the folder to the installation directory of CAT ET 2021A.



  • Run the patch files as administrator and wait for them to finish.



  • Contact the activation service provider by email or Teamviewer and provide them with your ID and password.



  • Wait for them to activate your software and send you a confirmation message.



Congratulations, you have successfully installed CAT ET 2021A on your computer. You can now start using it to communicate with your Caterpillar engines or machines.


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How to use CAT ET 2021A?




Connect to an ECM with a compatible hardware device




The first thing you need to do before using CAT ET 2021A is to connect to an ECM with a compatible hardware device. You can use a Caterpillar ET 3 device or another hardware device that can communicate with Cat Data Link protocols, such as Nexiq USB Link 2, DPA5, or XTruck USB Link.


To connect to an ECM with a compatible hardware device, you need to follow these steps:


  • Connect the hardware device to your computer with a USB cable.



  • Connect the hardware device to the ECM with a Cat Data Link cable.



  • Turn on the ignition switch of the engine or machine.



  • Open CAT ET 2021A on your computer and select the hardware device from the Communication Adapter drop-down menu.



  • Click on Connect and wait for CAT ET 2021A to establish a connection with the ECM.



You should see a green icon on the status bar indicating that you are connected to the ECM. You can also see the product name, serial number, and software version of the ECM on the Product Status screen.


Navigate through the menus and features of CAT ET 2021A




Once you are connected to an ECM, you can navigate through the menus and features of CAT ET 2021A. There are six main menus on the toolbar: File, View, Information, Service, Utilities, and Help. Each menu has different options and functions that you can use for various purposes. Here are some examples of what you can do with each menu:



MenuOptionFunction


FileNew SessionStarts a new session with a different ECM or product group.


Save SessionSaves the current session data to a file for later use.


PrintPrints the current screen or report to a printer or a file.


ExitCloses CAT ET 2021A and disconnects from the ECM.


ViewStatus BarToggles the display of the status bar at the bottom of the screen.


Status Tool BarToggles the display of the status tool bar at the top of the screen.


Data Monitor Tool BarToggles the display of the data monitor tool bar at the right of the screen.


Full ScreenSwitches to full screen mode for better visibility.


InformationProduct StatusDisplays the product name, serial number, software version, and other information of the connected ECM.


Product LinkDisplays the product link status and configuration of the connected ECM.


ECM SummaryDisplays a summary of the ECM information, such as the part number, flash file, and diagnostic codes.


ECM IdentificationDisplays the ECM identification information, such as the model, serial number, and software group.


ServiceData LoggerRecords and saves data from the ECM for later analysis.


DiagnosticsDisplays and clears diagnostic codes from the ECM.


ConfigurationAllows you to change or customize settings on the ECM.


CalibrationAllows you to adjust or calibrate parameters on the ECM.


UtilitiesPreferencesAllows you to change or customize settings on CAT ET 2021A, such as the language, units, display, and communication.


LicensingAllows you to view or update your license information for CAT ET 2021A.


Datalink TestTests the communication between your computer and the ECM.


Datalink MonitorMonitors the data traffic between your computer and the ECM.


HelpCAT ET HelpOpens the user manual for CAT ET 2021A.


About CAT ETDisplays the version and license information of CAT ET 2021A.


Check for UpdatesChecks for updates for CAT ET 2021A online.


Contact UsDisplays the contact information of Caterpillar or the software provider.


You can use these menus and features to perform various tasks with CAT ET 2021A, depending on your needs and preferences. You can also use the data monitor tool bar to view live data and parameters from the ECM, such as engine speed, coolant temperature, fuel pressure, and so on. You can customize the data monitor tool bar by adding, removing, or rearranging the gauges and graphs.


Perform diagnostics and troubleshooting with CAT ET 2021A




One of the most useful functions of CAT ET 2021A is to perform diagnostics and troubleshooting


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