C3.4B Engines Caterpillar

The electronic service tool is utilized to flash program a flash file into the ECM. The flash programming transfers the flash file from the PC to the ECM.

Use this process to program the engine flash file to the existing engine ECM. If the ECM is being replaced, refer to Troubleshooting, "Replacing the ECM" to flash program a blank ECM.

Flash Programming a Flash File

1. Connect the electronic service tool to the diagnostic connector.

2. From the menu bar go to the following menu options:

   • Service

   • Copy Configuration

   • ECM Replacement

3. Click on "Load From File" at the bottom of the screen.

4. Once the ECM data has been loaded, click on "Save to File" at the bottom of the screen. Select a folder location and click on "Save".

5. Obtain the part number for the new flash file.

   Note: If you do not have the part number for the flash file, use the "Flash File Search" tool on the Service Technician Workbench (STW). Alternatively, use the "Flash Software Files" feature on SIS Web.

   Note: You must have the engine serial number in order to search for the part number of the flash file.

6. Connect the electronic service tool to the diagnostic connector.

7. Turn the keyswitch to the ON position. Do not start the engine.

8. Select "WinFlash" from the "Utilities" menu on the electronic service tool.

   Note: If "WinFlash" will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate".

9. Flash program the flash file into the ECM.

   1. Select the engine ECM under the "Detected ECMs".

   2. Press the "Browse" button in order to select the part number of the flash file that will be programmed into the ECM.

   3. When the correct flash file is selected, press the "Open" button.

   4. Verify that the "File Values" match the application. If the "File Values" do not match the application, search for the correct flash file.

   5. When the correct flash file is selected, press the "Begin Flash" button.

   6. The electronic service tool will indicate when flash programming has been successfully completed.

10. From the menu bar go to the following menu options:

    • Service

    • Copy Configuration

    • ECM Replacement

11. Click on "Load From File" at the bottom of the screen.

12. Select the correct ECM replacement file. Check that the date and time stamp matches that of the desired replacement file and click on "OK".

13. Click on "Program ECM" at the bottom of the screen.

14. Once the "Programming Complete" dialog box appears on screen, click on "OK".

15. Access the "Configuration" screen under the "Service" menu in order to determine the parameters that require programming.

16. Start the engine and check for proper operation. Check that there are no active diagnostic codes.

"WinFlash" Error Messages

If any error messages are displayed during flash programming, click on the "Cancel" button in order to stop the process. Access the information about the "ECM Summary" under the "Information" menu. Ensure that you are programming the correct flash file for your engine.