WRENCH 0001339 - Caterpillar

Procedure
Illustration 1 g00429460
Display Area
(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).
Note: Illustration 1 shows the display from current production machines. The CID is now four digits. A decimal point "." has replaced the "F". The "F" came before the FMI. The display that is seen on earlier models is shown in illustration 2.
Illustration 2 g00300658
Display Area
(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).
The following procedures may cause new diagnostic codes to be logged. Therefore, before any procedures are performed make a list of all the active diagnostic codes in order to determine the system problems. Clear the diagnostic codes that were caused by the procedure, when each procedure is complete.Note: Before performing a procedure, always check all the circuit breakers. Repair the cause of any circuit breaker that is tripped.Use the following procedure to troubleshoot diagnostic code information.
Place the Caterpillar Monitoring System in service mode (mode 3). In order to place the Caterpillar Monitoring System in service mode, close the service and clear switches. Open the switches when service mode "3" 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 allows the diagnostic codes to be cleared when the problem has been fixed.
The diagnostic code is shown and the diagnostic code is on hold at this time. The display toggles between showing MID (3) and CID (5) and FMI (6). If you are in the service mode and a diagnostic code is not present, "---" will be displayed.
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" will be 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 030, 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 030, use this Service Manual Module to troubleshoot the diagnostic code that is generated.
Observe the "SERV CODE" indicator (4). In the service mode, the "SERV CODE" indicator functions as a "SERV CODE" indicator.
If the "SERV CODE" indicator (4) shows "SERV CODE",