Customer Communication Module (CCM) for Diesel Engines Caterpillar

The password protection for the CCM is initially enabled. Password protection may be necessary for some applications. Use the following procedure to enable password protection. Changing the password protection can be done with the PC software for the CCM . The password protection can also be changed by using a host device to write the IIDs.

Disabling Passwords

To disable the passwords, the AA12 and AA8A PIDs must be used.

Note: Refer to the Operation and Maintenance Manual, "Parameter Identifiers for General Usage".

1. Use IID 34 with a unit number of 61. Write to PID AA8A with the level 3 password. This will set the security level in the CCM to level 3. The message will be 5000340C0061AA8Ab1b2b3b4b5b6b7b8cs. The example above shows that b1 through b8 are the ASCII characters of the password. If the password is all spaces, simply end the message after PID AA8A. Do not include any of the data bytes. The CCM will automatically add spaces when a character is not present.

2. Use IID 34 with a unit number of 61. Write PID AA 12 with bit 3 set. This will disable the password protection. The message will be 500034050061AA1204cs. This message will disable the passwords. Baud rate changes will be enabled. The CCM will be set for a direct connection. Bits 1 and 2 should be set to 1 if the last two items need to be set the other way.

Note: When the passwords are disabled, all three passwords are set to all blanks (spaces).

Enabling Passwords

The AA12 and the F012 PIDs must be used in order to enable the password protection.

Note: Refer to the Operation and Maintenance Manual, "Parameter Identifiers for General Usage".

1. Use IID 34 with a unit number of 61. Write to PID AA12 to clear bit 3. The message format will be 500034050061AA1200cs. This message will enable the following items: passwords, change of baud rate and set the CCM for direct connect. Bits 1 and 2 should be set to 1 if the last two items need to be set the other way.

2. In order to enable the changes, the power to the CCM must be cycled or the security level must be written to zero. The security level is written to zero by using IID 34. The message will be 500034050061F01200cs.

   Note: When the passwords were disabled, each character was set to a blank or space. Set the level 3 password on the CCM to something other than spaces.