TUBE A 7W3808 - Caterpillar

Procedure
Illustration 1 g00673429
Display Area Of Caterpillar Monitoring SystemThe display area is showing the following information: Module Identifier (MID) (039), Component Identifier (CID) (0733) and Failure Mode (FMI) (03). (1) First display (2) Second display (3) Module identifier (MID) (4) Service code indicator ("SERV CODE") (5) Component identifier (CID) (6) Failure mode identifier (FMI)Use the following procedure to troubleshoot diagnostic code information.
Place the Caterpillar Monitoring System in service mode (mode 2). In order to place the Caterpillar Monitoring System in service mode, close the service and clear switches. Open the switches when service mode "2" is shown on the display.Note: The diagnostic scrolling mode may be entered in order to see the diagnostic codes, but the diagnostic codes can be more easily diagnosed by using the service mode. The service mode allows the diagnostic codes to be placed on hold for further investigation. The service mode will allow the service code to be cleared after the problem is corrected.
The service code is shown and the service code is on hold at this time. The display toggles between showing MID (3) and CID (5) and FMI (6). While you are in the service mode, screen (1) will show "---" only when no service codes are active or logged.
In order to view all the diagnostic codes, scroll through the diagnostic codes. In order to scroll through the diagnostic codes, close the service switch. The display momentarily shows MID (3), CID (5) and FMI (6) for each diagnostic code. The word "End" is shown after the last diagnostic code in the list.
Place the desired diagnostic code on hold. In order to place the diagnostic code on hold, open the service switch when the desired diagnostic code is shown.
Use the information from the MID in order to determine the ECM that is generating the diagnostic code. If the MID is not 039, see Electrical System Schematic, "Module Identifier (MID) Table" of the machine that is being serviced. Use the table to determine the ECM that has detected the diagnostic code. Then see the service manual module for that electronic control. If the MID is 039, use this Service Manual Module to troubleshoot the fault diagnostic code.
Observe the diagnostic code indicator (4). In service mode, the diagnostic code indicator functions as a fault present indicator.
If fault present indicator (4) shows "SERV CODE", then the fault that caused the diagnostic code that is shown is currently present.
If fault present indicator (4) is OFF, then the fault that caused the diagnostic code that is shown is not present at this time.
Refer to the test procedure in Testing and Adjusting in order to troubleshoot the diagnostic code with the same CID and the same FMI.
After a diagnostic code is corrected, clear the diagnostic code. In order to clear the diagnostic code, close the clear switch while the diagnostic code is on hold. After clearing, the display advances to the next available diagnostic code.
Repeat Steps 2 through 8 for the remaining diagnostic codes. Return to the normal mode when