When the electronic key is placed in the key switch and turned to the ON position, the key reader reads the unique ID. This ID is stored in the key. The ECM will then compare this ID to the list of authorized keys.
The status indicator turns a green color when the MSS has read an authorized key.
If the ID of the key matches an authorized key, the status indicator will turn a green color and the MSS will disarm. This disarming will allow the machine to operate.
If the ID of the key that is read does not match the list in the ECM, the status indicator will become a red color. The MSS remains in the "armed" state and the machine will remain disabled.
Note: Ensure that you have only one electronic key near the exciter coil when the MSS reads the key. If there is more than one key, the ECM will not be able to read the key and the machine will not start.
The Machine Security System can be configured to work in a combination of ways depending on the electronic architecture of the machine.
- Electronic Control
The MSS may disable the machine by controlling the electronic devices that are used to power critical machine systems. This is done by communicating with other ECM"s that have Immobilizer installed on them.
- Immobilizer
The MSS disables the machine by communicating with other electronic control modules across the Cat data link (CDL) or CAN data link and disabling critical machine functions. Immobilizer obtains status from the MSS and acts accordingly. If the Security ID is not authenticated, the MSS ECM will communicate to the ECM"s with Immobilizer installed and tell them not to allow operation.
To change the list of authorized keys or change the configuration parameters of the Machine Security System, the user must:
- Have Cat ET
and one of the following items:
- A key with Master Access Level for that specific Machine Security System
- A Factory Password
When a key with the master access level is not available, a Factory Password is required to change certain parameters in the configuration.
Refer to Testing and Adjusting, "Factory Password - Obtain" for additional information on Factory Passwords.
The Electronic Technician screen for the Factory Level Security Password will display the following parameters:
- ECM serial number
- "Product ID"(Serial Number of the machine)
- Serial Number of the Service Tool
- Reason Code
- Total Tattletale number
To obtain the proper passwords, the information must be given to an authorized Caterpillar dealer.
If a Master Access Level key for a machine being serviced is not available, a factory password must be entered before changes can be made. The following information is needed before you call for a factory password:
| Information That is Needed for the Factory Password | |
| Product Identification | |
| Serial Number for the ECM | |
| Serial Number from ET | |
| Tattletale | |
| Reason Code | |
Note: The password may only be used for one programming session. A different password will be required after you exit the Electronic Service Tool Screen.