PLATE AS 1389370 - Caterpillar

Illustration 1 g03330520
CAT® data-link circuitA CID 0590 is associated with the Cat® data-link between the Messenger ECM and the Engine ECM.An FMI 09 means the Messenger ECM is not receiving communication from the Engine ECM on the Cat data-link circuit.A CID 0248 FMI 09 companion diagnostic code is activated when the CID 0590 FMI 09 is activated by the Messenger ECM. A CID 0248 FMI 09 indicates that the Cat data-link is involved.Note: The CID 0248 FMI 09 is cleared when the CID 0590 FMI 09 is cleared. Possible causes for a CID 0590 FMI 09 are:
Data-link circuit open or poor connection
Engine ECM failure
Messenger ECM failureNote: A loss of power to the Engine ECM can cause the Messenger ECM to activate this diagnostic code. Ensure that the Engine ECM is powered up before proceeding with this procedure.Note: Ensure that CID 0590 FMI 09 is active before performing this procedure.Test Step 1. DETERMINE THAT THE DATA-LINK COMPANION CODE IS ACTIVE
Check the list of active diagnostic codes to determine if a CID 0248 FMI 09 companion diagnostic code is active.Results:
OK - The CID 0248 FMI 09 diagnostic code is active, indicating that the problem is in the Cat data-link. Proceed to the diagnostics for CID 0248 FMI 09.