Electronic Modular Control Panel II (EMCP II) for EUI Engines Caterpillar

Illustration 1	g00485981
System Schematic For CAT Data Link

On 3500B gensets, the GSC uses the CAT data link to communicate with the engine ECM. The CAT data link consists of two wires that connect the GSC to the engine ECM.

Procedure

The following conditions will cause a CID 248 FMI 9:

• 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.