HOSE AS 5T8734 - Caterpillar

Cat ® Electronic Technician (Cat ET)
When an abnormal operating condition occurs, the status screen on Cat Electronic Technician (Cat ET) indicates that there is an active event.Event codes are displayed on Cat ET in the following format:EXXXX Description of the codeThe "E" means that the code is an event code. The "XXXX" is a numeric identifier. The numeric identifier is followed by a description of the code.Active event codes are listed in ascending numerical order. The code with the lowest number is listed first. The active event code is removed from the list when the condition is no longer present.Logged Event Codes
Some event codes are logged in the ECM memory. Some event codes are active only. The logged event codes are listed in chronological order. The most recent code is listed first.A logged code is cleared from memory when one of the following conditions occur:
The service technician manually clears the code.
The code does not reoccur for 1000 hours.
A new code is logged and there are already ten logged codes in memory. In this case, the oldest logged code is cleared.Note: Always clear logged event codes after investigating and correcting the problem which generated the code.
Table 1
Events that are logged by the Machine Security System
EID Description Possible Cause/Recommended Response
E273 "Machine operation attempted using an invalid key" Probable Cause: An unrecognized key has been used to start the machine.
Recommended Action: Ensure that key list is up to date with all required keys.
E252 "Loss of Key Table Information" Probable Cause: Possible loss of key table.
Recommended Action: Check key table to ensure that it is correct. Possibly caused by improper machine shutdown. Logged Events
Illustration 1 g01097063
"Logged Event Codes" screen from theCaterpillar ® Electronic Technician for the Machine Security System
Logged events provide a secure list of events that are critical to the security of the machine. The ECM for the MSS is used to store information about events. When an event is detected, the following information is logged:
EID for the event
Number of occurrences
Time of the first occurrence of the event
Time of the last occurrence of the eventNote: The ECM will record a maximum of 127 occurrences of the events. The newest event replaces the oldest event after 127 events have been stored in the memory of the ECM.