BRACKET 6H9931 - Caterpillar

Using The Operator Monitor to Determine Diagnostic Trouble Codes
The E2 Series Compass monitor will display active fault codes and event codes as they occur as shown in Illustration 1.
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Active Event Code
Active and logged fault codes and event codes can also be viewed on the "DIAGNOSTIC INFO" screen. To access this screen, perform the following:
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Press main menu button (1).
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The "SETTING" menu list item will be highlighted. Use the up and down arrow buttons to highlight "DIAGNOSTIC INFO", then press the "OK" button.
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The "DIAGNOSTIC INFO" screen displays any active and/or logged codes. To view the details of a code, use the arrow buttons to select the desired code, then press the "OK" button.
Illustration 5 g06048992The code name or event details will now show on the screen. This screen includes the following information:
Code description
Number of occurrences
First time the code occurred - in service hours
Last time the code occurred - in service hoursNote: Codes cannot be deleted using the monitor. Codes can only be deleted using Cat® Electronic Technician.Using Cat® Electronic Technician (Cat ET) Service Tool to Determine Diagnostic Trouble Codes
Connect Cat® Electronic Technician (Cat ET) service tool to the ET port on the machine.
Turn the key switch to the RUN position.
Start the Cat ET software on the laptop. Cat ET will initiate communications with the Electronic Control Modules (ECM) on the machine. After communication has been established, Cat ET will list the ECM''s that are used on the machine.
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From the "File" menu, choose "Select ECM". Choose the desired ECM to view the diagnostic codes associated with that ECM.
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Choose from either "Active Diagnostic Codes" or "Logged Diagnostic Codes".
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Typical Cat ET screen for active diagnostic trouble codes
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Typical Cat ET screen for logged diagnostic trouble codes
Review the code list. Active diagnostic information includes a component identifier (CID), a failure mode identifier (FMI), and a text description of the problem. The logged diagnostic code screen includes the CID, FMI, and a text description of the code. In addition, the logged diagnostic data includes the number of occurrences, and the first and last time the problem has occurred.Note: Diagnostics are logged in non-volatile memory. When the machine is powered up, the ECM clears any diagnostic trouble codes that have not been detected or active within the last 150 hours of machine operation.
After the diagnostic trouble codes have been determined using Cat ET, refer to "Diagnostic Trouble Codes" in this manual. Find the code in the list to see which test procedure to use to diagnose the failure.
Performing the test procedures may cause new diagnostic trouble codes to be logged. Therefore, before any procedures are performed, make a list of all the active diagnostic trouble codes to determine the system problems. Clear the diagnostic trouble codes that were caused by the procedure when finished.Note: Before performing a procedure, always check all circuit breakers and fuses. Repair the cause of any tripped circuit breaker or blown fuse.