PIN-KING 9R0312 - Caterpillar

Illustration 1 g00614651
System Schematic For CAT data linkNote: The CID 248 FMI 9 replaces the former CID 560 FMI 11 for a CAT data link diagnostic code. System Operation On generator sets with the proper equipment, the GSC uses the CAT data link to communicate with other electronic control modules on the machine. The CAT data link consists of two wires that connect the GSC to at least one other electronic control module. The possible causes of a CID 248 FMI 9 diagnostic code are listed below:
There is a short from the wire that connects to contact "19" of the CAT data link to the battery ("B+").
There is a short from the wire that connects to contact "20" of the CAT data link to the battery ("B+").
There is a short from the wire that connects to contact "19" of the CAT data link to ground ("B-").
There is a short from the wire that connects to contact "20" of the CAT data link to ground ("B-").The GSC cannot detect an open in the circuit of the CAT data link. Troubleshoot the wiring and repair the wiring. See Testing And Adjusting, "Schematic and Wiring Diagrams".The GSC treats a CID 248 as an alarm fault. Active alarm faults are shown on the display when the alarm codes key is pressed. Also, the ECS is in any position except the OFF/RESET position. Clear the fault from the fault log after troubleshooting is complete.