SNUBBER GP 4517071 - Caterpillar

SAE J1939 DATA LINKThe CID 0247 FMI 14 diagnostic code is used by the Transmission/Chassis ECM as a "companion code" that is activated simultaneously with a diagnostic code from another control module in order to indicate that the SAE J1939 Data Link has an abnormal condition.The FMI 14 will match the FMI 14 that is activated for the control module diagnostic code. The FMI 14 means that the Transmission/Chassis ECM is communicating with the other control module, however, the Transmission/Chassis ECM is not receiving all of the expected information.The CID 0247 FMI 14 diagnostic code will never be activated by the Transmission/Chassis ECM as a stand-alone diagnostic code. The Transmission/Chassis ECM will only activate the CID 0247 FMI 14 diagnostic code along with one of the following module communication codes.CID 0596 FMI 14 - Implement ECMCID 0590 FMI 14 - Engine ECMFor example, if the Transmission/Chassis ECM detects that some expected operating parameter information is not being received from the Implement ECM over the SAE J1939 Data Link, the Implement ECM will simultaneously activate a CID 0596 FMI 14 (Implement ECM) diagnostic code and a CID 0247 FMI 14 (SAE J1939 Data Link) diagnostic code.If the Transmission/Chassis ECM did not activate the companion diagnostic code CID 0247 FMI 14 along with the control module code, the technician would not know which data link circuit (Cat Data Link or J1939 Data Link) is involved.When the CID 0247 FMI 14 diagnostic code is activated by the Transmission/Chassis ECM, always look for one of the control module diagnostic codes that are listed above in order to troubleshoot the problem.Perform the following procedure when the CID 0247 FMI 14 diagnostic code is activated. Verify that the CID 0247 FMI 14 diagnostic code is active before performing this procedure.Test Step 1.
The CID 0247 FMI 14 diagnostic code for the SAE J1939 Data Link is active. Look for one of the active control module diagnostic codes that is listed at the beginning of this procedure. Expected Result:One of the control module diagnostic codes that is listed at the beginning of this procedure is active.Results:
YES - One of the control module diagnostic codes that is listed at the beginning of this procedure is active.Repair: Go to the troubleshooting procedure for the active control module CID FMI diagnostic code. Perform the troubleshooting procedure for the SAE J1939 Data Link circuit that is detailed for the control module in order to isolate the problem.STOP