USING ELECTRONIC TECHNICIAN (ET) SOFTWARE
The basic Caterpillar ET operations are addressed in the instructions that follow. Figure 2 shows the Caterpillar
ET opening screen and Table 1 shows the primary navigation icons and their uses.
Select the Electronic Technician icon on the desktop of the MSD computer being used or select the
Electronic Technician program under Start/Programs/Caterpillar ET.
If a message This program is not licensed. License the program now? appears, select YES and
follow the on screen instructions or follow steps 4 through 12 in the previous section titled
TROUBLESHOOTING USING ELECTRONIC TECHNICIAN (ET).
On the ET screen, select the Connect icon (Table 1) if the Cat ET does not automatically connect to
a. If the ET cannot communicate (CONNECT) with the ECM, check the ET communication settings
by selecting Utilities pull down menu, select Preferences. For communications with the
Caterpillar Communication Adapter II, COM 1 should be selected. Click on Advanced button.
The baud rate should be 57600.
b. Click OK to close the Baud Rate window, Click OK to close the Preferences window. Select the
Connect icon again.
At menu selection, chose the 3126B Industrial engine.
After communications connection is established, the ECM Summary window is displayed. All of the
top tool bar ICONS (Table 1) should now be available.
Select Active Diagnostics Codes by clicking on the Active Diagnostics Codes icon or click on the
pull down menu for Diagnostics and selecting Active Diag. Codes.
a. The codes listed in the Active Diagnostics Code list are shown with the top priority code from the
top down. The first code shown is the most important and must be corrected first.
b. If other GSC codes have brought you to this ET screen for troubleshooting a problem, the top
priority Active Diagnostic Code problems must be corrected first.