BEARING 8F2021 - Caterpillar

Use this procedure to troubleshoot a diagnostic code for a special instruction. Use this procedure if one of the following diagnostic codes are active.Note: Some of the following codes may not be applicable for certain applications.
Table 1
Diagnostic Trouble Codes for the Data Link Configuration Status
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
639-14 247-14 J1939 Network #1 : Special Instruction The data received from the CAN A data bus is not in the correct format.
The code is logged.
1231-14 2348-14 J1939 Network #2 : Special Instruction The data received from the CAN B data bus is not in the correct format.
The code is logged.
5576-14 3468-14 Aftertreatment #1 Identification : Special Instruction The data received from the aftertreatment ID module is not in the correct format.
The code is logged. Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for an Associated -9 Code
A. Establish communication between the electronic service tool and the Electronic Control Module (ECM) for the engine.
B. Download a "Warranty Report" from the engine ECM before troubleshooting or clearing diagnostic trouble codes.
C. Check for active diagnostic codes.
Associated Trouble code
Result: An associated -9 code is logged.
Repair: Repair all associated -9 codes before continuing with this procedure. Refer to Troubleshooting, "CAN Data Link - Test".
If a -14 code is still present after resolving the -9 code, proceed to Test Step 2.
Result: An associated -9 code is not logged.
Proceed to Test Step 2.
2. Check the Personality Module Code for Compatibility with the Application
A. Connect to the electronic service tool.
B. Select the ECM connection that is related to the logged code.
C. Check if the personality module code is valid for the application.
Compatible personality module
Result: The code is valid for the application.
Proceed to Test Step 3.
Result: The code is not valid for the application.
Repair: Obtain the correct flash file and update the ECM. Reset