BUTTON HORN 1015385 - Caterpillar

Illustration 1 g02031734
Schematic of the Cat Data Link connections.The CID 0590 FMI 09 diagnostic code is associated with the communication between the Machine ECM and the Engine ECM. The communication is conducted on the Cat Data Link circuit or the communication that is conducted over the SAE J1939 CAN A Data Link circuit.The FMI 09 diagnostic code means that the Machine ECM is not receiving any communication from the Engine ECM on the involved data link circuit.A "companion" diagnostic code is activated when the diagnostic code is activated by the Machine ECM. The "companion" diagnostic code indicates the data link that is involved. The "companion" diagnostic code that has been activated will be either of the following diagnostic codes:CID 0247 FMI 09 - SAE J1939 Data LinkCID 0248 FMI 09 - Cat Data LinkDetermine the "companion" code that is activated simultaneously with the CID 0590 FMI 09 diagnostic code to determine which data link is involved.The "companion" code of the data link is cleared when the CID 0590 FMI 09 diagnostic code is cleared. The possible causes of the diagnostic code are listed below:
Terminating resistors on the J1939 CAN A Data Link are faulty
An ECM or smart device is not powering up
Lack of key switch input to an ECM or smart device (where applicable)
Excessive noise on the data link circuit
An open or a poor connection in the data link circuit
Software configuration mismatch
The Engine ECM has failed. This condition is unlikely.
The Machine ECM has failed. This condition is unlikely.Note: A loss of power in the system to the Engine ECM can cause the Machine ECM to activate this diagnostic code. Ensure that the Engine ECM is powered up before proceeding with this procedure.Note: Ensure that the CID 0590 FMI 09 diagnostic code is active before performing this procedure.Test Step 1. DETERMINE THE DATA LINK COMPANION CODE THAT IS ACTIVE
Check the list of active diagnostic codes in order to determine the "companion" diagnostic codes that are active:CID 0247 FMI 09 - SAE J1939 Data LinkCID 0248 FMI 09 - Cat Data LinkResults:
OK - Both the CID 0247 FMI 09 and the CID 0248 FMI 09 codes are active, check power to the Engine ECMSTOP
OK - The CID 0248 FMI 09 diagnostic code is active indicating that the problem is in the Cat Data Link. In order to perform the troubleshooting procedure for the Cat Data Link, proceed to the diagnostics for CID 0248 FMI 09.
OK - The CID 0247 FMI 09 diagnostic code is active indicating that the problem is in the SAE J1939 CAN A Data Link. In order to perform the troubleshooting procedure for the SAE J1939 CAN A Data Link, proceed to the diagnostics for CID 0247 FMI 09.