966G Wheel Loader and 972G Wheel Loader Power Train Caterpillar

General Information

Illustration 1	g00429878
4C-8195 Control Service Tool (1) Mode switch. (2) Clear switch. (3) Scroll switch.

The 4C-8195 Control Service Tool is helpful for the service person to make the proper electrical connections at the Caterpillar Monitoring System service connector during troubleshooting. Three connectors are wired in parallel so that the service tool is usable on the different types of machine harnesses.

Actuating the mode switch scrolls through the display modes of the Caterpillar Monitoring System. Actuating the scroll switch will cause the display to scroll when you are in the service mode or you are in the numeric readout mode. Actuating the clear switch in the service mode will clear the fault that is being continuously shown. Actuating the clear switch in tattletale mode clears all extreme values.

Procedure

Illustration 2	g00462496
Display Area Of Caterpillar Monitoring System (1) First display. (2) Module identifier (MID). (3) Service code indicator "SERV CODE". (4) Second display. (5) Component identifier "CID". (6) Failure mode identifier "FMI".

Use the following procedure to troubleshoot the service code information. Connect the 4C-8195 Control Service Tool to the service connector at the fuse panel.

1. Place the Caterpillar Monitoring System in service mode (mode 3). In order to place the Caterpillar Monitoring System in service mode, press and hold the mode switch of the control service tool. Release the mode switch when the service mode indicator "-3-" is shown on the display.

   Note: The diagnostic scrolling mode may be entered in order to see the service codes, but the service codes can be more easily diagnosed by using the service mode. The service mode allows the service codes to be placed on hold for further investigation. When the problem has been fixed, the service mode will also allow the service codes to be cleared.

2. A service code is shown and the service code is on hold at this time. The display toggles between showing MID (2) and CID (5) and FMI (6). When there are no service codes in the service mode, screen (1) will show "---".

3. In order to view all the service codes, scroll through the service codes. In order to scroll through the service codes, press and hold the scroll switch of the control service tool. The display momentarily shows MID (2), CID (5) and FMI (6) for each service code. The word "End" is shown after the last service code in the list.

4. Place the desired service code on hold. In order to place the service code on hold, release the scroll switch when the desired service code is shown.

5. Use the information from the MID in order to determine the ECM that is generating the service code. If the MID is not 081, 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 fault. Then see the service manual module for that electronic control. If the MID is 081, use this Service Manual Module to troubleshoot the fault that generated the service code.

6. Observe service code indicator (3). In service mode, the service code indicator functions as a fault present indicator.
   • If fault present indicator (3) shows "SERV CODE", then the fault that caused the service code that is shown is currently present.

   • If fault present indicator (3) is OFF, then the fault that caused the service code that is shown is not present at this time.

7. Refer to the test procedure in Testing and Adjusting in order to troubleshoot the service code with the same CID and the same FMI.

8. After a service code is corrected, clear the service code. In order to clear the service code, momentarily press the clear switch of the service tool while the fault is on hold. After clearing, the display advances to the next available service code.

9. Repeat Steps 2 through 8 for the remaining service codes. Return to the normal mode when you are finished. In order to return to the normal mode, press and hold the mode switch of the control service tool. Release the mode switch when normal mode "-0-" is shown on the display.