CORE AS-FUEL COOLER 3542850 - Caterpillar

Caterpillar Electronic Technician Service Tool
When an abnormal operating condition of the excavator occurs, the status screen on the Caterpillar 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
Every event code is logged in the ECM memory. 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 recur 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.Troubleshooting
Perform the following steps in order to troubleshoot an event:
Obtain the following information from the operator:
The event and the time of the event
Determine the engine operating conditions at the time of the event. Conditions such as engine rpm and load may be important.
Determine if there are any systems that were installed by the dealer or by the customer that could cause the event.
Verify that the event is not due to normal machine operation. Verify that the event is not due to error of the operator.
Check all fluid levels and all oil levels.
Troubleshoot and repair any active diagnostic codes. Event Code List
The following table lists the event codes that apply to the 311D. 312D, 314D, 315D, and 319D excavator control system. The recommended operator response is listed. Use the Cat ET service tool in order to determine the event codes that are active or logged.
Table 2
Event Codes For The Machine ECM (MID 39)    
Code (Level)    Description    Possible Cause / Recommended Response    
E15 (2)     High Engine Coolant Temperature Derate     Engine output has been decreased to prevent engine coolant from overheating,. This code shows that the process of decreasing the engine speed has been instituted.    
E17 (2)     High Engine Coolant Temperature Warning     Immediately stop operating the machine and allow the machine to cool.    
E23 (2)     High Hydraulic Oil Temperature Derate     Engine output has been decreased to prevent hydraulic oil from overheating. This code shows that the process of decreasing the engine speed has been instituted.    
E43 (2)     Low System Voltage Warning     In order to troubleshoot, check associated diagnostic codes that will occur with this event code.    
E50 (2)     High System Voltage Warning     Check associated diagnostic codes that will occur with this event code.    
E59 (2)     Low Engine Coolant