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Customers of Caterpillar do not have access to the Cat Factory Password System (FPS).Factory passwords are necessary to authorize access to certain screens on the electronic service tool. Factory passwords are also used to access specific configuration parameters in the Electronic Control Module (ECM). If changes are made that require factory passwords, the "Enter Factory Passwords" dialog box will automatically be displayed. A factory password must be obtained before the change can be made.A hyperlink is available at the bottom of the dialog box that will simplify the entry of ECM information into the FPS. To use this hyperlink, the Personal Computer (PC) that is running the electronic service tool must be connected to the Internet. When the hyperlink is selected, the ECM information will automatically be transferred to the entry screen on the Cat FPS.If the PC that is running the electronic service tool is not connected to the Internet, the information can be saved to a file. This file can be opened when the PC is connected to the Internet and a hyperlink will be displayed. When you select the hyperlink, the ECM information will automatically be transferred to the entry screen that is on the Cat FPS.Factory passwords may be required to perform each of the following functions in the electronic service tool:ECM Replacement - When an ECM is replaced, the system configuration parameters must be programmed into the new ECM. The new ECM will allow specific parameters to be programmed once without the use of factory passwords. There may be parameters that require factory passwords on the ECM that is being replaced. Factory passwords may be required to configure these parameters on the new ECM.Rerate Engine Power - Changing the interlock code may be necessary. The interlock code is protected by factory passwords.Software Enabled Attachments - The application may have special features that can be enabled with the electronic service tool. This customized software is available to provide enhanced operation for the application. These features may also require the installation of more hardware on the application. A cost may be associated with these software enabled attachments. Factory passwords are necessary to enable this software.Customer passwords - Factory passwords are required to restore customer passwords. Factory passwords are also required to reset customer passwords.Set Configuration parameters - Factory passwords are required to modify specific configuration parameters. Refer to Troubleshooting, "Configuration Parameters" for details that are related to the parameters for your application.If factory passwords are needed to change a parameter, the electronic service tool will request the password when the change is attempted. Newer versions of the electronic service tool display a padlock icon to indicate that a parameter requires a factory password for modification.Clear engine events and certain diagnostic codes - Some engine events require factory passwords to clear the code from ECM memory. For example, factory passwords must be obtained to clear a code that is related to an engine overspeed condition. Clear these codes only when you are certain that the fault has been corrected.