SEAL-O-RING 4J0521 - Caterpillar

Factory level security passwords are required for clearing certain logged events and for changing certain programmable parameters. Because of the passwords, only authorized personnel can make changes to some of the programmable items in an Electronic Control Module (ECM). When the correct passwords are entered, the changes are programmed into the master ECM.Factory passwords are required to program the following shutdowns:
"Engine Overspeed"
"High Engine Oil Temperature"
"High Oil Filter Differential Pressure"
"Low Oil Filter Differential Pressure"
"High Engine Oil to Engine Coolant Differential Temperature"The "Enter Factory Passwords" screen on Cat ET will display the following parameters. To obtain the proper passwords, the information must be given to an authorized Caterpillar dealer:
Current master ECM
Serial number of the service tool
Serial number of the engine
Serial number of the master ECM
Diagnostic clock
Total Tattletale
ReasonThe old interlock code is required to change the interlock code on a used ECM. The passwords may only be obtained by an authorized Caterpillar dealer.The passwords may only be used for one programming session. After you exit the "Enter Factory Passwords" screen on Cat ET, a different set of passwords will be required before you can program the master ECM.Factory passwords are not required for the first hour of operation for a new master ECM. After the hour expires, factory passwords are required for some of the programming.