How to Use CAT ET 2025A to Test Misfire Detection for Caterpillar Machines

This guide explains how to perform a Misfire Detection Test using the CAT ET 2025A diagnostic software on Caterpillar machines. The Misfire Detection function helps identify misfiring cylinders through a graphical display of parameters specific to each cylinder. The parameter used depends on the engine type and which parameter best represents a cylinder misfire.

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Accessing the Misfire Detection Function

1. Open CAT ET 2025A software.
2. From the Diagnostics menu, select Diagnostic Tests.
3. Choose Misfire Detection from the submenu.
4. The Misfire Detection screen will appear.

Screen Layout

The Misfire Detection screen includes several key areas:

Cylinder Selection Area

• Contains a drop-down list of available cylinder numbers.
• Selecting a new cylinder automatically refreshes the graph to display that cylinder’s data.

Graph Area

• X-axis: Displays time in seconds (default 30-second intervals).
• Y-axis: Displays the selected cylinder’s parameter value.
• The graph automatically centers the trace for easy viewing.

Status Parameter Area

• Displays a list of engine parameters and their current values.
• The parameters shown depend on the engine and operating conditions when detecting a misfire.
• If the data cannot be read, “Unavailable” appears under the parameter name.

Button Functions

• Start/Stop – Click Start after selecting a cylinder to begin the test. The graph will start drawing real-time data.
  • Once the test begins, the Start button becomes Stop.
  • Clicking Stop freezes the graph display.
• Hold/Resume – Click Hold to pause the graph and inspect parameter values at a specific moment.
  • The button changes to Resume, which resumes live graph updates when clicked.
• Settings / Switch Bank – On certain engines, this option lets users toggle between odd and even banks of cylinders (useful for 12- or 16-cylinder engines). The odd bank displays Cylinder #1 by default.

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