SHAFT 4E9225 - Caterpillar

Cat® DATA LINKThe CID 0248 FMI 09 diagnostic code is used by the Transmission ECM as a companion diagnostic code. The code is activated simultaneously with another control module diagnostic code to indicate that the Cat Data Link has an abnormal condition.The FMI 09 diagnostic code will match the FMI 09 that is activated for the control module diagnostic code. The FMI 09 diagnostic code means that the Transmission ECM has lost all communication with the other control module.The CID 0248 FMI 09 diagnostic code will never be activated by the Transmission ECM as a stand-alone diagnostic code. The Transmission ECM will only activate the CID 0248 FMI 09 diagnostic code along with one of the following module communication codes.CID 0590 FMI 09 - Engine ECMIf the Transmission ECM did not activate the companion diagnostic code CID 0248 FMI 09 along with the control module code, the technician would not know which data link circuit is involved.When the CID 0248 FMI 09 diagnostic code is activated by the Transmission ECM, always look for a control module diagnostic code to troubleshoot the problem.Perform the following procedure when the CID 0248 FMI 09 diagnostic code is activated. Verify that the CID 0248 FMI 09 diagnostic code is active before performing this procedure.Test Step 1.
The CID 0248 FMI 09 diagnostic code for the Cat 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 Cat Data Link circuit that is detailed for the control module to isolate the problem.STOP